阅读说明：本技术 加速器放射性核素固体靶自动溶靶装置及方法 (Automatic target dissolving device and method for accelerator radionuclide solid target ) 是由 李光 温凯 段菲 马承伟 褚浩淼 赵紫宇 张文辉 李洪玉 赵海龙 李忠勇 李超 于 2021-06-25 设计创作，主要内容包括：本发明提供一种加速器放射性核素固体靶自动溶靶装置及方法,包括：溶解槽组件,包括平行设置的溶解槽底座和溶解槽上盖,所述溶解槽底座靠近所述溶解槽上盖的一侧向内凹陷形成第一凹槽,所述溶解槽上盖对应于所述第一凹槽的位置向内凹陷形成第二凹槽,所述第二凹槽的槽底设置有贯通于所述溶解槽上盖的液体孔和气体孔,所述液体孔内插设有导管；加热组件,设置于所述第一凹槽内,所述加热组件靠近所述第二凹槽的一侧构造出平面；升降组件,连接于所述溶解槽上盖。溶靶过程的各个环节均可自动化完成,废气可以集中处理,操作人员不必直接接触溶靶装置以及靶片组件,减少了放射性物质以及废气对操作人员造成的伤害和对操作环境造成的污染和腐蚀。(The invention provides an automatic target dissolving device and method for an accelerator radionuclide solid target, which comprises the following steps: the dissolving tank assembly comprises a dissolving tank base and a dissolving tank upper cover which are arranged in parallel, wherein one side, close to the dissolving tank upper cover, of the dissolving tank base is inwards recessed to form a first groove, the position, corresponding to the first groove, of the dissolving tank upper cover is inwards recessed to form a second groove, a liquid hole and a gas hole which penetrate through the dissolving tank upper cover are formed in the tank bottom of the second groove, and a guide pipe is inserted into the liquid hole; the heating component is arranged in the first groove, and a plane is formed on one side, close to the second groove, of the heating component; and the lifting component is connected to the upper cover of the dissolving tank. All links of the target dissolving process can be automatically completed, waste gas can be intensively treated, an operator does not need to directly contact the target dissolving device and the target piece assembly, and the harm of radioactive substances and the waste gas to the operator and the pollution and corrosion to the operating environment are reduced.)

1. An accelerator radionuclide solid target automatic target dissolving device, which is characterized by comprising:

the dissolving tank assembly comprises a dissolving tank base and a dissolving tank upper cover which are arranged in parallel, wherein one side, close to the dissolving tank upper cover, of the dissolving tank base is inwards recessed to form a first groove, the position, corresponding to the first groove, of the dissolving tank upper cover is inwards recessed to form a second groove, a liquid hole and a gas hole which penetrate through the dissolving tank upper cover are formed in the tank bottom of the second groove, and a guide pipe is inserted into the liquid hole;

the heating component is arranged in the first groove, and a plane is formed on one side, close to the second groove, of the heating component;

the lifting assembly is connected with the upper cover of the dissolving tank and is suitable for switching the upper cover of the dissolving tank between a first position state and a second position state;

in the first position state, the second groove is hermetically connected to the dissolving tank base;

in the second position, a space is arranged between the second groove and the dissolving tank base.

2. The accelerator radionuclide solid target automatic target dissolving device according to claim 1, wherein an inner container is provided on an inner wall of the second groove.

3. The accelerator radionuclide solid target automatic target dissolving device according to claim 2, wherein one end of the inner container near the heating assembly protrudes outwards to form a boss.

4. The accelerator radionuclide solid target automatic target dissolving device according to claim 1, wherein the lifting assembly comprises a bottom plate and a top plate arranged in parallel and a side plate connected to the same side of the bottom plate and the top plate;

the dissolving tank base is connected to one side, close to the top plate, of the bottom plate, the dissolving tank upper cover is arranged between the dissolving tank base and the top plate, and a driving mechanism is arranged between the top plate and the dissolving tank upper cover.

5. The accelerator radionuclide solid target automatic target dissolving device according to claim 1, wherein a buffer is provided between the dissolving tank base and the dissolving tank upper cover.

6. The accelerator radionuclide solid target automatic target dissolving device according to claim 1, wherein the heating assembly comprises a heating plate and a heating rod, a heating hole is formed in the heating plate, and the heating rod is inserted into the heating hole.

7. The accelerator radionuclide solid target auto-targeting device according to claim 1, wherein the heating assembly further comprises a temperature sensor.

8. The automatic target dissolving device for the radionuclide solid target according to any one of claims 1 to 7, wherein an ejection assembly is arranged on the side plate, and the ejection assembly comprises an ejection cylinder and an ejector rod connected to the ejection cylinder;

a top hole is formed in the position, located between the side plate and the first groove, of the dissolving tank bottom seat, the hole bottom of the top hole is flush with the plane, and the top rod is movably inserted into the top hole;

the bottom seat of the dissolving tank is provided with a notch at a position between the first groove and one side far away from the side plate, and the bottom surface of the notch is flush with the plane.

9. An automatic target dissolving method for an accelerator radionuclide solid target is characterized by comprising the following steps:

putting the target sheet and the target dissolving solution into a dissolving tank, continuously ventilating and stirring at a first temperature and collecting waste gas in the target dissolving process;

collecting reaction solution after a first time interval, washing the target sheet and the dissolving tank by using ultrapure water, and collecting washed liquid;

and drying the dissolving tank and the target piece under a second temperature condition, continuously ventilating the dissolving tank and collecting gas passing through the dissolving tank in the drying process, and taking out and collecting the target piece.

10. The method of claim 9, wherein the step of placing the target piece and the target solution into the dissolution tank further comprises:

and detecting the vacuum degree of the dissolving tank and preheating to the initial temperature.

Technical Field

The invention relates to the technical field of production of radionuclides of a cyclotron, in particular to an automatic target dissolving device and method for a radionuclides solid target of an accelerator.

Background

Cyclotron can use charged particles to cause nuclear reactions to produce radionuclides, which are the main source of nuclides for radiopharmaceuticals. Radionuclides produced by cyclotrons are generally neutron-deficient nuclides, mostly with electron capture or emission of beta⁺The decay of the ion form is of special significance in the diagnosis and treatment of medical problems such as cancer. Classical radionuclides include:¹⁸F、⁵⁷Co、⁶⁴Cu、⁶⁷Ga、⁸⁹Zr、¹⁰³Pd、¹¹¹In、¹²³I、²⁰¹tl, and the like. The target of the accelerator is a core component for producing nuclide, and the target sheet generates nuclear reaction in the accelerator to generate the required nuclide product. The target can be classified into a solid target, a liquid target and a gas target according to the material form of the target, wherein the solid target is the target form commonly used for producing nuclide. The solid target completes nuclear reaction in an accelerator, the product nuclide is remained on the target sheet, and the next separation and purification work can be carried out only after the target sheet is dissolved, so that the target with higher purity is obtainedA pure product of the target nuclide. When dissolving the target, the target needs to be dissolved in a target solution in a dissolution tank. The target sheet is made of simple substance metal, and the chemical property of the simple substance metal of most solid target sheets is inactive, so that the target sheet can be completely dissolved by heating and proper stirring.

The process of dissolving the target should be as short as possible, on one hand, the target dissolving time is too long, which may result in the decay of the target product and decrease of yield, and on the other hand, the time for handling the radioactive material should be as short as possible. In the existing method for dissolving the target plate, in order to ensure the dissolving efficiency, the heating and dissolving of the target plate are realized by manual operation in a relatively open environment. Wherein, the heating is water bath heating generally, and the by-product hydrogen generated by the dissolution reaction can realize bubbling stirring, and the aggregation of hydrogen and acid gas can not occur under the ventilation state. However, the drawbacks of manual operations, as well as relatively open operations, are also evident, both as injuries to the operator and as pollution and corrosion to the operating environment.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an automatic target dissolving device for an accelerator radionuclide solid target. The target sheet is placed in the dissolving tank and heated by the heating component, and the heating process can be remotely controlled. The bottom of the second groove is provided with a liquid hole and a gas hole, a guide pipe is inserted in the liquid hole and used for adding a target dissolving solution and collecting a reaction solution, and waste gas generated in the target dissolving process is collected through the gas hole. All links of the target dissolving process can be automatically completed, waste gas can be treated in a centralized manner, and the harm of radioactive substances and the waste gas to operators and the pollution and corrosion to the operating environment are reduced.

Meanwhile, the invention also provides an automatic target dissolving method of the radionuclide solid target of the accelerator.

According to the embodiment of the first aspect of the invention, the automatic target dissolving device for the radionuclide solid target of the accelerator comprises:

the dissolving tank assembly comprises a dissolving tank base and a dissolving tank upper cover which are arranged in parallel, wherein one side, close to the dissolving tank upper cover, of the dissolving tank base is inwards recessed to form a first groove, the position, corresponding to the first groove, of the dissolving tank upper cover is inwards recessed to form a second groove, a liquid hole and a gas hole which penetrate through the dissolving tank upper cover are formed in the tank bottom of the second groove, and a guide pipe is inserted into the liquid hole;

the heating component is arranged in the first groove, and a plane is formed on one side, close to the second groove, of the heating component;

the lifting assembly is connected with the upper cover of the dissolving tank and is suitable for switching the upper cover of the dissolving tank between a first position state and a second position state;

in the first position state, the second groove is hermetically connected to the dissolving tank base;

in the second position, a space is arranged between the second groove and the dissolving tank base.

According to one embodiment of the invention, an inner container is arranged on the inner wall of the second groove.

According to one embodiment of the invention, one end of the inner container close to the heating assembly protrudes outwards to form a boss.

According to one embodiment of the invention, the lifting assembly comprises a bottom plate and a top plate which are arranged in parallel and a side plate which is connected to the same side of the bottom plate and the top plate;

the dissolving tank base is connected to one side, close to the top plate, of the bottom plate, the dissolving tank upper cover is arranged between the dissolving tank base and the top plate, and a driving mechanism is arranged between the top plate and the dissolving tank upper cover.

According to one embodiment of the invention, a buffer is arranged between the dissolving tank base and the dissolving tank upper cover.

According to one embodiment of the invention, the heating assembly comprises a heating plate and a heating rod, wherein a heating hole is formed in the heating plate, and the heating rod is inserted into the heating hole.

According to an embodiment of the invention, the heating assembly further comprises a temperature sensor.

According to one embodiment of the invention, the side plate is provided with an ejection assembly, and the ejection assembly comprises an ejection cylinder and an ejector rod connected with the ejection cylinder;

a top hole is formed in the position, located between the side plate and the first groove, of the dissolving tank bottom seat, the hole bottom of the top hole is flush with the plane, and the top rod is movably inserted into the top hole;

the bottom seat of the dissolving tank is provided with a notch at a position between the first groove and one side far away from the side plate, and the bottom surface of the notch is flush with the plane.

According to the accelerator radionuclide solid target automatic target dissolving method provided by the embodiment of the second aspect of the invention, the accelerator radionuclide solid target automatic target dissolving device provided by the embodiment of the first aspect of the invention comprises the following steps:

putting the target sheet and the target dissolving solution into a dissolving tank, continuously ventilating and stirring at a first temperature and collecting waste gas in the target dissolving process;

collecting reaction solution after a first time interval, washing the target sheet and the dissolving tank by using ultrapure water, and collecting washed liquid;

and drying the dissolving tank and the target piece under a second temperature condition, continuously ventilating the dissolving tank and collecting gas passing through the dissolving tank in the drying process, and taking out and collecting the target piece.

According to an embodiment of the present invention, before placing the target piece and the target dissolving solution into the dissolving tank, the method further comprises:

and detecting the vacuum degree of the dissolving tank and preheating to the initial temperature.

One or more technical solutions in the present invention have at least one of the following technical effects:

the automatic target dissolving device for the accelerator radionuclide solid target comprises a dissolving tank assembly, a heating assembly and a lifting assembly. A first groove is constructed on a dissolving tank base of the dissolving tank assembly, a second groove is constructed on an upper cover of the dissolving tank, and the dissolving tank is formed after the first groove and the second groove are buckled. The heating component is arranged in the first groove, and a plane is formed on one side of the heating component close to the second groove and used for placing the target plate. The bottom of the second groove is provided with a liquid hole and a gas hole for conveying solution and gas. The lifting component is connected to the upper cover of the dissolving tank and used for controlling the upper cover of the dissolving tank to be close to or far away from the base of the dissolving tank. During the use, the target piece is placed on heating element's plane, and the second recess butt forms inclosed target environment of dissolving in the edge of target piece, and the joining of dissolving the target liquid and the collection of reaction solution can be gone on through the liquid hole, and the waste gas that produces in the reaction passes through the gas hole and collects the processing in unison. After the target plate is dissolved, ultrapure water is injected into the liquid hole to wash the dissolving tank and the target plate. The dissolving tank and the target are dried by the cooperative work of the heating component, the liquid hole and the gas hole. All links of the target dissolving process can be automatically completed, waste gas can be intensively treated, operators do not need to directly contact the target dissolving device and target pieces, and the harm of radioactive substances and waste gas to the operators and the pollution and corrosion to the operating environment are reduced.

Drawings

Fig. 1 is a first cross-sectional view of an accelerator radionuclide solid target automatic target dissolving device according to an embodiment of the invention;

FIG. 2 is a second cross-sectional view of an automatic target-dissolving device for radionuclide solid targets of an accelerator according to an embodiment of the present invention;

FIG. 3 is a first flowchart of an automatic target-dissolving method for an accelerator radionuclide solid target according to an embodiment of the present invention;

fig. 4 is a second flowchart of an automatic target dissolving method for an accelerator radionuclide solid target according to an embodiment of the present invention.

Reference numerals:

11. a dissolving tank base; 12. the upper cover of the dissolving tank; 111. a first groove; 112. a buffer member; 121. a second groove; 122. a liquid port; 123. a gas hole; 124. a conduit; 125. an inner container; 1251. a boss; 31. a base plate; 32. a top plate; 33. a side plate; 34. a drive mechanism; 21. heating plates; 22. a heating rod; 23. a temperature sensor; 4. ejecting the assembly; 41. ejecting out the cylinder; 42. and a push rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The process of dissolving the target should be as short as possible, on one hand, the target dissolving time is too long, which may result in the decay of the target product and decrease of yield, and on the other hand, the time for handling the radioactive material should be as short as possible. In the existing method for dissolving the target plate, in order to ensure the dissolving efficiency, the heating and dissolving of the target plate are realized by manual operation in a relatively open environment. Wherein, the heating is water bath heating generally, and the by-product hydrogen generated by the dissolution reaction can realize bubbling stirring, and the aggregation of hydrogen and acid gas can not occur under the ventilation state. However, the drawbacks of manual operations and of relatively open operations are also evident, on the one hand causing both injury to the operators and pollution and corrosion to the operating environment, and on the other hand impurities which are easily introduced into the environment, reducing the quality of the target product.

In a first aspect, an embodiment of the present invention provides an automatic target dissolving device for an accelerator radionuclide solid target, referring to fig. 1 to 2, including a dissolving tank assembly, a heating assembly, and an elevating assembly.

A dissolving tank is constructed in the dissolving tank assembly and used for placing the target sheet and the target dissolving solution, and the reaction solution and the target sheet in the dissolving tank are recovered after the target dissolving is finished.

The dissolving tank component comprises a dissolving tank base 11 and a dissolving tank upper cover 12, wherein the dissolving tank base 11 and the dissolving tank upper cover 12 are arranged in parallel. One side of the dissolving tank base 11 close to the dissolving tank upper cover 12 is recessed inwards to form a first groove 111, and the position of the dissolving tank upper cover 12 corresponding to the first groove 111 is recessed inwards to form a second groove 121. The upper dissolving tank cover 12 is arranged above the upper dissolving tank, and the base dissolving tank 11 is arranged below the upper dissolving tank.

The first groove 111 and the second groove 121 are buckled to form a dissolving tank, and when the first groove 111 and the second groove 121 are far away, the target plate can be placed or taken out.

The bottom of the second groove 121 is provided with a liquid hole 122 and a gas hole 123 penetrating the upper lid 12 of the dissolution tank, and a conduit 124 is inserted into the liquid hole 122.

In use, the target solution is injected into the conduit 124, and the reaction solution after target dissolution is sucked up through the conduit 124. When the target is dissolved, the waste gas generated in the reaction is collected at the gas hole 123, and when the dissolving tank is dried, the gas hole 123 can be ventilated, so that the dissolving tank and the target sheet are dried quickly.

The heating assembly is used for heating the target sheet and the target dissolving solution so as to promote the rapid occurrence of target dissolving reaction. The heating element is placed in the first groove 111, and a side of the heating element close to the second groove 121 forms a plane.

During the use, the target piece subassembly is placed on heating element's plane, and the target piece subassembly includes the target piece and overlaps the sealed pad of establishing target piece edge. The bottom of the inner wall of the second groove 121 is fastened to the sealing pad, and the second groove 121, the sealing pad and the target plate form a closed accommodating space. The containing space is filled with a target solution, and target solution reaction is carried out at a certain temperature.

The lifting component is connected to the upper cover 12 of the dissolving tank and used for driving the upper cover 12 of the dissolving tank to switch position states, and the position states comprise a first position state and a second position state.

In the first position, the second groove 121 is fastened to the dissolution tank base 11, i.e. the bottom of the inner wall of the second groove 121 abuts against the gasket of the target assembly.

In the second position, the second groove 121 is spaced from the dissolution tank base 11 for placing and removing the target assembly.

As described above, the dissolution tank is constructed between the dissolution tank base 11 and the dissolution tank upper cover 12, the heating unit is placed in the first groove 111, and the target assembly is placed on the plane of the heating unit. The lifting assembly drives the upper lid 12 of the dissolution tank to make the bottom end of the inner wall of the second groove 121 abut against the sealing gasket of the target assembly. The gasket, the target piece, and the second groove 121 constitute a receiving space for the target solution, and the target solution is injected into the receiving space through the liquid hole 122. The gas hole 123 is used for collecting waste gas generated during target dissolving, and the waste gas is uniformly injected into the alkali treatment bottle, so that the waste gas is prevented from leaking polluted air or causing damage to operators. After the target dissolving reaction is completed, the reaction solution in the dissolution tank is sucked up through the conduit 124, ultrapure water is added for cleaning, and the cleaned liquid is collected uniformly. And drying the cleaned dissolving tank and the target piece, and taking out the target piece assembly after drying.

All links of the target dissolving process can be automatically completed, waste gas is intensively treated, operators do not need to directly contact the target dissolving device and target pieces, and the harm of radioactive substances and waste gas to the operators and the pollution and corrosion to the operating environment are reduced.

The second groove 121 of the upper lid 12 of the dissolution tank directly contacts the target dissolution solution, which has strong acidity and oxidation, and the target assembly, which has radioactivity.

According to an embodiment of the present invention, the inner container 125 is disposed on the inner wall of the second groove 121, and the inner container 125 is made of an anti-oxidation, anti-acid and anti-radiation material, so as to prevent the second groove 121 or the upper lid 12 of the dissolution tank from directly contacting the target solution or the target assembly.

In one embodiment, the inner container 125 is made of PEEK.

In one embodiment, the entire upper lid 12 of the dissolution tank is made of oxidation-resistant, acid-resistant and radiation-resistant materials.

In one embodiment, to facilitate the proper abutment of the inner container 125 with the target assembly, the end of the inner container 125 adjacent the heating assembly is outwardly convex to form a ledge 1251, and the ledge 1251 extends beyond the bottom edge of the second recess 121.

During the use, the elevating module drive dissolving tank upper cover 12 is close to dissolving tank base 11, and boss 1251 butt in the sealed pad of target piece subassembly, forms inclosed dissolving target space.

According to one embodiment of the present invention, the lifting assembly includes a bottom plate 31, a top plate 32, and side plates 33.

The bottom plate 31 and the top plate 32 are arranged in parallel, the side plate 33 is connected to the same side of the bottom plate 31 and the top plate 32, and a certain distance is reserved between the bottom plate 31 and the top plate 32. The dissolution tank base 11 is mounted on the bottom plate 31 on the side of the bottom plate 31 adjacent to the top plate 32. The dissolution tank upper cover 12 is provided between the dissolution tank base 11 and the ceiling plate 32, and a drive mechanism 34 is provided between the dissolution tank upper cover 12 and the ceiling plate 32.

When the device is used, the bottom plate 31 is used for fixing the dissolving tank base 11, the driving mechanism 34 enables the dissolving tank upper cover 12 to be close to or far away from the dissolving tank base 11, and the lifting assembly can ensure the position stability and accuracy between the dissolving tank base 11 and the dissolving tank upper cover 12.

In one embodiment, the drive mechanism 34 is a cylinder including a cylinder body and a movable end. The cylinder body is connected with the top plate 32, and the movable end is connected with the upper cover 12 of the dissolving tank.

When the cylinder body is arranged above the top plate 32, a through hole is also arranged on the top plate 32, the movable end is inserted into the through hole, and the end part of the movable end is connected to the upper cover 12 of the dissolving tank.

A liquid circulation hole is formed in the top plate 32 at a position corresponding to the liquid hole 122, and a gas circulation hole is formed in the top plate 32 at a position corresponding to the gas hole 123, so that liquid and gas can be circulated.

According to one embodiment of the invention, a buffer member 112 is arranged between the dissolving tank base 11 and the dissolving tank upper cover 12, and the buffer member 112 can relieve the pressure from the lifting assembly on the target assembly, so as to prevent the target assembly from being deformed or damaged under the action of external force.

In one embodiment, the number of the buffering members 112 is four, and the buffering members are uniformly distributed at four corners of the dissolution tank base 11.

When the position is switched to the first position state, the buffer member 112 can reduce the stress difference, ensure the fastening precision, and ensure the position stability and precision between the dissolving tank base 11 and the dissolving tank upper cover 12. Meanwhile, the buffer member 112 can also relieve the pressure from the lifting assembly on the target assembly, so as to avoid damage or deformation of the target.

When the target piece assembly is switched to the second position state, the buffer member 112 elastically resets under the action of self hydraulic pressure or/and a spring, internal pressure is released, the upper cover 12 of the dissolving tank is jacked open, and the target piece assembly is convenient to put in and take out.

In one embodiment, the buffer 112 is a hydraulic buffer, which relies on hydraulic damping to buffer and decelerate the object acting thereon to a stop, thereby providing a certain degree of protection to prevent the mechanism from being damaged due to hard collision during operation. The hydraulic buffer elastically resets under the double elastic action of the hydraulic buffer and the spring, releases the internal pressure and jacks the upper cover 12 of the dissolving tank of the device.

According to one embodiment of the invention, the heating assembly comprises a heating plate 21 and a heating rod 22. A heating hole is formed in the heating plate 21, and a heating rod 22 is inserted into the heating hole. The number of the heating holes can be a plurality of heating holes, and the heating holes are uniformly distributed in the heating plate 21, so that the temperature of all parts of the heating plate 21 is uniformly balanced.

When the device is used, the heating rod 22 is connected with a control circuit, so that the temperature on the heating plate 21 can be remotely adjusted, and the dissolution rate of the target piece can be further adjusted.

In one embodiment, a temperature sensor 23 is also provided on the heating assembly. The temperature sensor 23 is used for monitoring the temperature of the heating assembly and feeding back the temperature of the heating assembly in time so as to facilitate accurate control.

According to an embodiment of the invention, the target assembly needs to be taken out after being dried, and in order to avoid direct contact of an operator with the target assembly, the automatic target dissolving device for the radionuclide solid target of the accelerator further comprises an ejection assembly 4.

In one embodiment, the ejector assembly 4 is mounted on the side plate 33. The ejection assembly 4 comprises an ejection cylinder 41 and an ejector rod 42, and the ejector rod 42 is connected to the ejection cylinder 41.

The dissolving tank base 11 is provided with an ejection hole at a position between the side plate 33 and the first groove 111, and the bottom of the ejection hole is flush with the plane of the heating assembly. A notch is arranged on the dissolving tank base 11 between the first groove 111 and the side far away from the side plate 33, and the bottom surface of the notch is flush with the plane of the heating component or not higher than the plane of the heating component.

In case the heating assembly comprises a heating plate 21, the hole bottom of the ejection hole as well as the bottom surface of the indentation is flush with the plate surface of the heating plate 21.

When the device is used, the ejection air cylinder 41 pushes the ejector rod 42 to move forwards, and the ejector rod 42 contacts the target piece assembly at the plane of the heating assembly to push the target piece assembly out of the notch. When the ejection assembly 4 works, the operation personnel can be prevented from directly contacting the target assembly through remote control, and the radioactive danger is reduced.

The automatic target dissolving method for the radionuclide solid target of the accelerator provided by the embodiment of the second aspect of the invention can be applied to⁵⁷Co、⁶⁴Cu、⁶⁷Ga、⁶⁸Ge、¹⁰⁹Cd、¹¹¹The target dissolving process of In and other nuclides has wide application range. Referring to fig. 3 to 4, the method includes the following steps:

s1, placing the target sheet and the target dissolving solution into a dissolving tank, continuously ventilating and stirring under the first temperature condition, and collecting waste gas in the target dissolving process.

S2, collecting the reaction solution after the first time interval, rinsing the target piece and the dissolution tank with ultrapure water, and collecting the rinsed liquid.

And S3, drying the dissolving tank and the target piece under the second temperature condition, continuously ventilating the dissolving tank and collecting gas passing through the dissolving tank in the drying process, and taking out and collecting the target piece.

It is understood that the target assembly is placed in the dissolution tank, and the target solution is injected into the dissolution tank. The selection of the target solution is related to the material of the target piece, and a nitric acid solution or a mixed solution of a hydrochloric acid solution and a hydrogen peroxide solution can be selected. The temperature during target dissolving is related to the material of the target sheet and the selected target dissolving liquid, so that the target dissolving reaction is promoted.

In order to sufficiently contact the target solution with the target piece during the target dissolving process, the target solution needs to be stirred.

In one embodiment, the dissolution tank is in a vacuum state, and the target solution is stirred by bubbling hydrogen gas generated by the reaction.

In another embodiment, a gas is injected into the target solution and stirred by gas bubbling.

Waste gases such as hydrogen, acid gas and the like can be generated in the reaction process, and the waste gases are uniformly collected and then introduced into the alkali treatment bottle, so that the pollution of the waste gases to the environment is avoided, and the damage to operators can be reduced.

Controlling the target dissolving process within 3-10min, and collecting the reaction solution in the dissolving tank after the target dissolving process is finished.

After the reaction solution is collected, the reaction product still adheres to the dissolution tank and the target plate, and the reaction product is radioactive. The reaction product needs to be fully collected and utilized to increase the production efficiency.

After the reaction solution in the dissolving tank is collected, the dissolving tank and the target piece assembly are cleaned through ultrapure water, and the cleaned liquid is collected into the reaction solution in a unified manner.

After the dissolution tank and the target piece are cleaned, the automatic radionuclide solid target dissolution device of the accelerator needs to be cleaned. And drying the dissolving tank and the target sheet, and continuously ventilating in the drying process. The gas passing through the dissolving tank is uniformly collected to the alkali treatment bottle, so that leakage is avoided. The target assembly is then removed and collected.

In order to shorten the target dissolving time and reduce the time occupied by the temperature rising process of the target dissolving solution and the target piece in the dissolving tank, the method also comprises the following steps before the target piece and the target dissolving solution are placed in the dissolving tank:

and S10, detecting the vacuum degree of the dissolving tank and preheating to the initial temperature.

It will be appreciated that preheating the dissolution tank prior to placing the target pellet reduces the time taken for the temperature rise of the target pellet in the dissolution tank. After the target sheet and the target dissolving solution are placed in the dissolving tank, the temperature is quickly raised to the first temperature at the preheating temperature, so that the target dissolving time is saved.

The vacuum degree of the dissolving tank is detected before the target sheet is placed, the vacuum degree is between 0 and 30kpa, the tightness of the dissolving tank can be detected, leakage in the target dissolving process is avoided, and the influence of radioactive leakage on the environment and operators is avoided.

The following describes the operation of the accelerator radionuclide solid target automatic target dissolving method with reference to two embodiments:

example one

Radioactivity¹¹¹The In nuclide is generated by plating cadmium on a copper target sheet serving as a substrate and then bombarding the copper substrate by particles of a cyclotron¹¹²Cd(p,2n)¹¹¹In nuclei are generated.

Step 1, checking the integrity of the target dissolving device, enabling the operation software to be in a state of being arranged in a target piece assembly, and placing the target piece into a dissolving tank.

And 2, detecting the vacuum degree of the dissolving tank to ensure that no gas leaks during reaction.

And 3, extracting 4-9mol/L nitric acid solution as target dissolving solution, wherein the target dissolving temperature is controlled at 18-25 ℃. In the target dissolving process, the target dissolving tank is in a vacuum state, and hydrogen generated by reaction is utilized to stir the reaction solution, so that the reaction efficiency is increased. And introducing gas generated in the reaction process into an alkali treatment bottle to carry out recovery treatment on the waste gas.

And 4, dissolving the target for 3-10 minutes, then collecting the reaction solution, washing the target sheet and the dissolving tank by using 5mL of ultrapure water, and recycling the washed liquid into the reaction solution to avoid the loss of the radionuclide.

And 5, drying the dissolving tank and the target sheet at 80-120 ℃, keeping the drying time for 3-10min, continuously ventilating the dissolving tank in the drying process, collecting the gas passing through the dissolving tank to an alkali treatment bottle, and recovering and treating the waste gas. Finally, the target piece is taken out of the dissolution tank.

Example two

The target sheet is a copper substrate, gold is plated on the copper substrate, then nickel is plated, and the nickel plating layer is generated after bombardment of particles generated by a cyclotron⁶⁴Ni(p,n)⁶⁴And (4) carrying out Cu nuclear reaction.

Step 1, checking the integrity of the target dissolving device, enabling the operation software to be in a state of being arranged in a target piece assembly, and placing the target piece into a dissolving tank.

And 2, detecting the vacuum degree of the dissolving tank to ensure that no gas leaks during reaction. Then, the dissolution tank is preheated, and the preheating temperature is controlled at 80 ℃.

And 3, preparing a target solution by using a 5mol/L hydrochloric acid solution and a hydrogen peroxide solution, and controlling the target solution temperature to be 100 ℃. In the target dissolving process, the target dissolving tank is in a vacuum state, and hydrogen generated by reaction is utilized to stir the reaction solution, so that the reaction efficiency is increased. And introducing gas generated in the reaction process into an alkali treatment bottle to carry out recovery treatment on the waste gas.

And 4, dissolving the target for 5 minutes, then collecting the reaction solution, washing the target sheet and the dissolving tank by using 5mL of ultrapure water, and recycling the washed liquid into the reaction solution to avoid the loss of the radionuclide.

And 5, drying the dissolving tank and the target sheet at 100 ℃, keeping the drying time for 5min, continuously ventilating the dissolving tank in the drying process, collecting the gas passing through the dissolving tank to an alkali treatment bottle, and recovering and treating the waste gas. Finally, the target piece is taken out of the dissolution tank.

In summary, the present invention provides an automatic target dissolving device and method for an accelerator radionuclide solid target, wherein the automatic target dissolving device for an accelerator radionuclide solid target includes a dissolving tank assembly, a heating assembly and a lifting assembly. A first groove is constructed on a dissolving tank base of the dissolving tank assembly, a second groove is constructed on an upper cover of the dissolving tank, and the dissolving tank is formed after the first groove and the second groove are buckled. The heating component is arranged in the first groove, and a plane is formed on one side of the heating component close to the second groove and used for placing the target plate. The bottom of the second groove is provided with a liquid hole and a gas hole for conveying solution and gas. The lifting component is connected to the upper cover of the dissolving tank and used for controlling the upper cover of the dissolving tank to be close to or far away from the base of the dissolving tank. During the use, the target piece is placed on heating element's plane, and the second recess butt forms inclosed target environment of dissolving in the edge of target piece, and the joining of dissolving the target liquid and the collection of reaction solution can be gone on through the liquid hole, and the waste gas that produces in the reaction passes through the gas hole and collects the processing in unison. After the target plate is dissolved, ultrapure water is injected into the liquid hole to wash the dissolving tank and the target plate. The dissolving tank and the target are dried by the cooperative work of the heating component, the liquid hole and the gas hole. All links of the target dissolving process can be automatically completed, waste gas can be intensively treated, operators do not need to directly contact the target dissolving device and target pieces, and the harm of radioactive substances and waste gas to the operators and the pollution and corrosion to the operating environment are reduced.

Under the condition that the inner container is arranged in the second groove, the oxidation resistance, the acid resistance and the radiation resistance of the automatic target dissolving device for the radionuclide solid target of the accelerator are improved, and the service life of the device is prolonged.

In the case where the elevating assembly includes a bottom plate, a top plate, side plates, and a driving mechanism, accuracy and stability of the position between the second recess and the target assembly can be ensured.

Under the condition that the buffer member is arranged between the dissolving tank base and the dissolving tank upper cover, the buffer member buffers and decelerates an object acting on the buffer member to stop by means of damping, a certain degree of protection is achieved, and the mechanism can be prevented from being damaged due to hard collision in the working process.

Under the condition that the heating assembly is provided with the temperature sensor, the temperature sensor is used for monitoring the temperature of the heating assembly and feeding back the temperature of the heating assembly in time so as to be convenient for accurate control.

Under the condition that the ejection assembly is installed on the side plate, the ejection cylinder pushes the ejector rod to move forwards, the ejector rod contacts the target piece assembly at the plane of the heating assembly, and the target piece assembly is pushed out from the notch. When the ejection assembly works, the ejection assembly can be remotely controlled, so that an operator is prevented from directly contacting the target assembly, and the radioactive danger is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.