阅读说明：本技术 可控210Po-Be同位素中子源的生产方法及可控210Po-Be同位素中子源 (Controllable210Production method and controllable Po-Be isotope neutron source210Po-Be isotope neutron source ) 是由 石夏青 苏耿华 于 2018-10-16 设计创作，主要内容包括：本发明提供了一种可控~(210)Po-Be同位素中子源的生产方法,包括如下的依次步骤：(1)提供容器、驱动件、圆柱金属基体和Be靶；(2)在圆柱金属基体侧面的部分区域设置含~(209)Bi的化合物；(3)对圆柱金属基体进行辐照处理；(4)将Be靶和圆柱金属基体隔离放置于容器内,启动驱动件并使圆柱金属基体于驱动件的作用旋转并改变圆柱金属基体设置含~(209)Bi的化合物的区域与Be靶的相对位置。本发明在圆柱金属基体的侧面设置的是含~(209)Bi的化合物,该设置不涉及放射性操作,操作方便且能确保操作人员的安全,且可通过控制圆柱金属基体的旋转角度和驱动件输出轴的转速来控制中子发射的强度以及频率,从而解决现有的同位素中子源存在的中子发射难以控制、结构复杂和使用不便等问题。(The invention provides a controllable 210 The production method of the Po-Be isotope neutron source comprises the following steps in sequence: (1) providing a container, a driving member, a cylindrical metal substrate and a Be target; (2) the partial area of the side surface of the cylindrical metal substrate is provided with a groove 209 A compound of Bi; (3) carrying out irradiation treatment on the cylindrical metal matrix; (4) placing the Be target and the cylindrical metal matrix in a container in an isolated manner, starting the driving member, rotating the cylindrical metal matrix under the action of the driving member and changing the setting of the cylindrical metal matrix 209 Relative position of a region of Bi compound to Be target. The invention is arranged on the side surface of a cylindrical metal matrix and comprises 209 The Bi compound is not involved in radioactive operation, is convenient to operate, can ensure the safety of operators, and can control the intensity and frequency of neutron emission by controlling the rotation angle of the cylindrical metal matrix and the rotation speed of the output shaft of the driving piece, thereby solving the problems that the neutron emission of the existing isotope neutron source is difficult to control and has a complex structureand inconvenience in use.)

1. Controllable²¹⁰The production method of the Po-Be isotope neutron source is characterized by comprising the following steps in sequence:

(1) Providing a container, a driving member, a cylindrical metal substrate and a Be target;

(2) A part of the area of the side surface of the cylindrical metal substrate is provided with a groove²⁰⁹A compound of Bi;

(3) Carrying out irradiation treatment on the cylindrical metal matrix;

(4) Placing the Be target and the cylindrical metal matrix in the container in an isolated manner, starting the driving piece, rotating the cylindrical metal matrix under the action of the driving piece and changing the setting of the cylindrical metal matrix²⁰⁹Relative position of a region of a compound of Bi to the Be target.

2. Controllable according to claim 1²¹⁰The production method of the Po-Be isotope neutron source is characterized in that the step (3) is to send the cylindrical metal matrix into a reactor for irradiation.

3. Controllable according to claim 1²¹⁰a production method of a Po-Be isotope neutron source is characterized in that the distance between the cylindrical metal matrix and the Be target in the step (4) is less than²¹⁰Range of the Po isotope alpha particle emitter.

4. Controllable²¹⁰The Po-Be isotope neutron source is characterized by comprising a container, a driving piece, a cylindrical metal matrix and a Be target, wherein the cylindrical metal matrix and the Be target are arranged in the container in an isolated mode, an output shaft of the driving piece is fixed on the cylindrical metal matrix and can drive the cylindrical metal matrix to rotate, and partial area of the side face of the cylindrical metal matrix is provided with a driving component²¹⁰Po.

5. Controllable according to claim 4²¹⁰The Po-Be isotope neutron source is characterized in that partial areas of the side surface of the cylindrical metal substrate are continuously provided with a catalyst²¹⁰po.

6. Controllable according to claim 4²¹⁰The Po-Be isotope neutron source is characterized in that the cylindrical metal matrix is a cylindrical zirconium alloy matrix.

7. Controllable according to claim 4²¹⁰The Po-Be isotope neutron source is characterized in that a fixing hole is formed in the center of the cylindrical metal base body, and an output shaft of the driving piece is fixed with the fixing hole.

8. Controllable according to claim 4²¹⁰The Po-Be isotope neutron source is characterized in that the surface of the Be target, which is opposite to the cylindrical metal substrate, is in a circular arc surface shape or a polygonal shape.

9. Controllable according to claim 8²¹⁰The Po-Be isotope neutron source is characterized in that the surface of the Be target opposite to the cylindrical metal base body is in an arc surface shape, and the symmetry axis of a cylinder which can Be formed by the arc surface shape of the Be target is overlapped with the symmetry axis of the cylindrical metal base body.

10. Controllable according to claim 4²¹⁰The Po-Be isotope neutron source is characterized in that the Be target is a Be metal sheet or a metal sheet plated with Be metal.

Technical Field

the invention relates to the technical field of isotope neutron source production, in particular to a controllable isotope neutron source²¹⁰Production method and controllable Po-Be isotope neutron source²¹⁰A Po-Be isotope neutron source.

Background

Neutron sources are devices that release neutrons, with a wide variety of sources ranging from hand-held radioactive sources to research piles and fission sources in neutron research facilities. Depending on differences in neutron energy, neutron fluence rates, equipment size, cost, and government regulations, different specifications of neutron sources can be widely used in the physical, engineering, medical, nuclear weapons, oil exploration, biological, chemical, nuclear power, and other industries.

neutron sources typically include isotope neutron sources, accelerator neutron sources, reactor neutron sources, and plasma neutron sources. Wherein the isotope neutron source is mainly based on the following three nuclear reactions: (α, n) reaction, (γ, n) reaction and spontaneous fission. The first two are the radioactive rays which emit certain energy when the radioactive nuclide decays and bombard some target substances to generate nuclear reaction and emit neutrons.

The traditional (alpha, n) type isotope neutron source has the advantages of small volume, long service life, low dosage rate of accompanying gamma rays and high neutron energy, but the traditional (alpha, n) type isotope neutron source is that a heavy-core alpha particle emitter and Be powder are mixed tightly, and the heavy-core alpha particle emitter and the Be powder cannot Be separated after being mixed, so that neutron emission cannot Be controlled. Because the neutron emission is uncontrollable and interrupted, a heavy shielding layer must be added around the neutron source, which brings inconvenience to the movement and use of the neutron source; also, an uncontrollable neutron source can cause more radiation dose to personnel in use, and can also cause more serious radiation safety risks once lost. Therefore, the isotope neutron source is made into a controllable device with light structure, low cost, high safety, good stability and adjustable neutron flux, and has gradually become one of the important development directions of the isotope neutron source.

Disclosure of Invention

It is an object of the invention to provide an improved controllable²¹⁰Production method of Po-Be isotope neutron source and production method thereof²¹⁰A Po-Be isotope neutron source aims to solve the problems that neutron emission is difficult to control, the structure is complex, the use is inconvenient and the like in the existing isotope neutron source.

To achieve the above object, the present invention provides a controllable²¹⁰the production method of the Po-Be isotope neutron source comprises the following steps in sequence:

(1) Providing a container, a driving member, a cylindrical metal substrate and a Be target;

(2) The partial area of the side surface of the cylindrical metal substrate is provided with a groove²⁰⁹A compound of Bi;

(3) Carrying out irradiation treatment on the cylindrical metal matrix;

(4) Placing the Be target and the cylindrical metal matrix in a container in an isolated manner, starting the driving member, rotating the cylindrical metal matrix under the action of the driving member and changing the setting of the cylindrical metal matrix²⁰⁹Relative position of a region of Bi compound to Be target. Wherein, the driving piece can be a motor, and the irradiation treatment is neutron irradiation treatment.

Preferably, step (2) may be performed by continuously disposing the metal substrate on a half area of the side surface of the cylindrical metal substrate²⁰⁹A compound of Bi. Can be combined with²⁰⁹The Bi compound is arranged on the side surface of the cylindrical metal substrate through coating, film plating and other fixing modes. Due to the fact that²⁰⁹bi is generated after being irradiated by neutrons²¹⁰Bi，²¹⁰Bi decay to²¹⁰Po，²¹⁰The decay of Po emits alpha particles which,²¹⁰Alpha particles emitted by Po react with Be target to generate neutrons, and the side surface of the cylindrical metal matrix is fully utilized to Be provided with more neutrons²⁰⁹Bi compound can enhance the intensity of the neutron beam pulse.

Preferably, step (3) is to feed the cylindrical metal matrix into the reactor for irradiation, in particularAnd (3) encapsulating the cylindrical metal matrix in a cladding tube, inserting the cladding tube into a control rod guide tube or an instrument tube of a nuclear power plant reactor fuel assembly for irradiation, wherein the irradiation treatment is neutron irradiation treatment. Can be safely and conveniently arranged on the side surface of a cylindrical metal matrix in a fuel assembly of a nuclear power station reactor²⁰⁹The compound of Bi is subjected to irradiation treatment.

Preferably, the distance between the cylindrical metal matrix and the Be target in the step (4) is less than²¹⁰the distance between the cylindrical metal matrix and the Be target is less than²¹⁰At the range of the Po isotope alpha particle emitter,²¹⁰The alpha particles emitted by Po can interact with the Be target to produce neutrons.

The invention also provides a controllable device²¹⁰A Po-Be isotope neutron source comprises a container, a driving part, a cylindrical metal base body and a Be target, wherein the cylindrical metal base body and the Be target are arranged in the container in an isolated mode, an output shaft of the driving part is fixed on the cylindrical metal base body and can drive the cylindrical metal base body to rotate, and partial area of the side face of the cylindrical metal base body is provided with a containing part²¹⁰Po. Controllable²¹⁰The Po-Be isotope neutron source refers to²¹⁰The neutron beam pulse intensity and frequency of the Po-Be isotope neutron source and the on-off control of neutron emission are controllable, the on-off control of neutron emission refers to that when the cylindrical metal matrix contains²⁰⁹When the Bi region is separated from the Be target, no neutrons are emitted.

Preferably, a partial region of the side of the cylindrical metal substrate is continuously provided with²¹⁰Po.

Preferably, the cylindrical metal matrix is a cylindrical zirconium alloy matrix. The cylindrical zirconium alloy matrix has weak absorption capacity to neutrons, and the absorption to the generated neutrons is reduced.

Preferably, a fixing hole is formed in the center of the cylindrical metal base, and the output shaft of the driving member is fixed to the fixing hole. The inner wall of the fixing hole may be provided with a screw thread.

Preferably, the surface of the Be target opposite to the cylindrical metal substrate is in the shape of an arc surface or a polygon, and when the surface of the Be target opposite to the cylindrical metal substrate is in the shape of an arc surface, the symmetry axis of a cylinder formed by the arc surface of the Be target can Be overlapped with the symmetry axis of the cylindrical metal substrate, so that the distance between the cylindrical metal substrate and the Be target is constant.

Preferably, the Be target is a Be metal sheet or a metal sheet plated with Be metal.

Compared with the prior art, the controllable device of the invention²¹⁰The production method of Po-Be isotope neutron source adopts cylindrical metal base body and partial region of its side surface is equipped with a catalyst²⁰⁹A compound of Bi containing²⁰⁹The treatment of the Bi compound does not involve radioactive operation, so the operation is convenient and the safety of operators can be ensured,²⁰⁹Production of Bi by neutron irradiation²¹⁰Bi，²¹⁰Easy decay of Bi to form²¹⁰Po，²¹⁰The Po decays to emit alpha particles. Due to the side of the cylindrical metal substrate²⁰⁹The Bi compound is finally decayed into²¹⁰Po, when the driving member is started and the cylindrical metal substrate is rotated under the action of the driving member and the arrangement of the cylindrical metal substrate is changed²⁰⁹The relative position of the region of Bi compound to the Be target, the side of the cylindrical metal substrate is regularly close to and away from the Be target,²¹⁰Alpha particles emitted by Po and Be target act to generate neutrons, the intensity of the neutron emission is controlled by controlling the rotation angle of the cylindrical metal matrix, stable neutron beam pulses with different frequencies can Be obtained by controlling the rotation speed of the output shaft of the driving part, and the controllable neutron beam pulse is controlled according to the invention²¹⁰Controllable production method of Po-Be isotope neutron source²¹⁰The Po-Be isotope neutron source has the advantages of simple structure, controllable neutron beam pulse intensity, frequency and neutron emission switch, stable performance, convenient movement, safety, reliability and the like.

Drawings

FIG. 1 is a view showing the controllability²¹⁰A partial cross-sectional view of a Po-Be isotope neutron source;

FIG. 2 is a schematic structural view of a cylindrical metal substrate;

Fig. 3 is a partial cross-sectional view of the assembly of a cylindrical metal base with a cladding tube.

Detailed Description

in order to explain the technical contents and structural features of the present invention in detail, the following description is given with reference to the embodiments.

the invention is controllable²¹⁰An embodiment of a method for producing a Po-Be isotope neutron source comprises the following sequential steps:

(1) Providing a container, a driving member, a cylindrical metal substrate and a Be target;

(2) Continuously arranging a metal layer on a half area of the side surface of the cylindrical metal substrate²⁰⁹A compound of Bi;

(3) Performing neutron irradiation treatment on the cylindrical metal matrix;

(4) Placing Be metal sheet and cylindrical metal matrix in a container in an isolated manner, starting a driving piece, rotating the cylindrical metal matrix under the action of the driving piece and changing the content of the cylindrical metal matrix²⁰⁹Relative position of the region of Bi compound to the Be metal sheet.

wherein the cylindrical metal matrix is a cylindrical zirconium alloy matrix, the step (3) is to encapsulate the cylindrical metal matrix in a cladding tube, insert the cladding tube into a control rod guide tube or an instrument tube of a nuclear power plant reactor fuel assembly for irradiation, and the distance between the cylindrical metal matrix and the Be target is less than²¹⁰Range of the Po isotope alpha particle emitter.

The controllable device of the present invention will be further explained with reference to the accompanying drawings²¹⁰A Po-Be isotope neutron source.

Please refer to fig. 1, which is a view illustrating the control²¹⁰The Po-Be isotope neutron source device 100 comprises a container 1, a driving part 2, a cylindrical metal matrix 3 and a Be target 4, wherein the cylindrical metal matrix 3 and the Be target 4 are arranged in the container 1, an output shaft 21 of the driving part 2 is fixed on the cylindrical metal matrix 3 and can drive the cylindrical metal matrix 3 to rotate, specifically, the output shaft 21 of the driving part 2 penetrates through the container 1 to Be fixed with the cylindrical metal matrix 3 and can drive the cylindrical metal matrix 3 to rotate, and partial areas on the side surface of the cylindrical metal matrix 3 are continuously provided with a driving liquid²¹⁰po, coating layer 31. Specifically, the driving member 2 may be a motor, and the driving member 2 drives the output shaft 21 to rotate and further drives the cylindrical metal substrate 3 to rotate, and the cylindrical metal substrate 3 includes²¹⁰The sides of the coating 31 of Po are regularly close to and away from the Be target 4 so that²¹⁰intermittent interaction between Po and Be target 4，²¹⁰Alpha particles emitted by Po and in Be target 4⁹Be acts to generate neutrons. The intensity of neutron emission is controlled by controlling the rotation angle of the cylindrical metal matrix 3, and stable neutron beam pulses with different frequencies can be obtained by controlling the rotation speed of the output shaft 21 of the driving part 2.

Referring to fig. 1 and 2, the output shaft 21 of the driving member 2 is fixed to the cylindrical metal base 3, specifically, a fixing hole 32 is formed in the center of the cylindrical metal base 3, and the output shaft 21 of the driving member 2 is fixed to the fixing hole 32. The inner wall of fixed orifices 32 can set up the screw thread, and fixed orifices 32 is located the one end of cylinder metal base member 3, and fixed orifices 32 is the through-hole in this embodiment, and output shaft 21 of driving piece 2 passes the top of container 1 and is fixed with the through-hole of cylinder metal base member 3, and driving piece 2 can drive output shaft 21 rotatory, and then drives cylinder metal base member 3 rotatory, and half regional continuous setting of cylinder metal base member 3 side contains²¹⁰coating layer 31 of Po, containing²¹⁰alpha particles capable of emitting by Po coating 31 and in Be target 4⁹Be acts to generate neutrons.²¹⁰The Po-Be isotope neutron source 100 can Be controlled by controlling the content of the isotope²¹⁰The rotation angle of the cylindrical metal matrix 3 of the Po coating layer 31 is used for controlling the intensity of neutron emission, and stable neutron beam pulses with different frequencies can be obtained by controlling the rotation speed of the output shaft 21 of the driving part 2, and the controllable neutron beam pulse device is controllable²¹⁰the Po-Be isotope neutron source 100 has the advantages of simple structure, stable performance, convenient movement, safety, controllability and the like.

Specifically, the cylindrical metal matrix 3 may be a cylindrical zirconium alloy matrix, and the absorption capability of the cylindrical zirconium alloy matrix to neutrons is weak, so that the absorption of the generated neutrons is reduced.

It should Be further noted that the Be target 4 may Be a Be metal sheet or a metal sheet plated with Be metal, the side surface of the Be target 4 opposite to the cylindrical metal base 3 is arc-surface-shaped or polygonal, in this embodiment, the Be target 4 is a circular arc-surface-shaped Be metal sheet, and the symmetry axis of the cylinder formed by the arc-surface shape of the Be target 4 overlaps with the symmetry axis of the cylindrical metal base 3 (as shown in fig. 1), so that the distance between the cylindrical metal base 3 and the Be target 4 is constant. Be target 4 is fixed to the bottom of container 1 by support 41, the side of cylindrical metal substrate 3Opposite to the Be target 4, the distance between the cylindrical metal base 3 and the Be target 4 is preferably smaller than²¹⁰The range of the Po isotope alpha particle emitter is provided with a cylindrical metal matrix 3 on the side surface²¹⁰The coating layer 31 of Po may be a layer containing²¹⁰The coating 31 of Po is continuously distributed on a part of the side of the cylindrical metal matrix 3, or may be intermittently distributed, depending on the neutron pulse to be generated, and this embodiment includes²¹⁰The coating layer 31 of Po is continuously distributed over a half area of the side surface of the cylindrical metal base body 3. For the side surface of the cylindrical metal substrate 3²¹⁰The coating layer 31 of Po is formed by first providing a coating layer containing Po on a partial region of the side surface of the cylindrical metal substrate 3²⁰⁹The setting of the compound of Bi can be carried out by coating, plating and other fixing modes, which do not involve radioactive operation, are convenient to operate and can ensure the safety of operators, after neutron irradiation treatment,²⁰⁹bi formation²¹⁰Bi，²¹⁰easy decay of Bi to form²¹⁰Po, which forms inclusions on the side of the cylindrical metal substrate 3²¹⁰Po, coating layer 31.

For a partial region of the side of the cylindrical metal base body 3²⁰⁹Referring to FIG. 3, after the neutron irradiation treatment with the Bi compound, a catalyst containing element is provided in a partial region of the side surface of the cylindrical metal substrate 3²⁰⁹After the Bi compound is added, the cylindrical metal matrix 3 is sent into a reactor for irradiation, specifically, the cylindrical metal matrix 3 is placed in a cladding tube 5, the inner diameter of the cladding tube 5 is slightly larger than or equal to the outer diameter of the cylindrical metal matrix 3, and a plurality of cylindrical metal matrices 3 can be accommodated in the cladding tube 5 to increase the content²¹⁰The manufacturing rate of the cylindrical metal matrix 3 of the Po coating 31, the upper end plug 51 and the lower end socket 52 are respectively and fixedly arranged at the two ends of the cladding tube 5 so as to seal the cladding tube 5, the fixing modes of the upper end plug 51 and the lower end socket 52 and the cladding tube 5 can be screw thread fixing, helium arc welding or clamping fixing and the like, and then the cladding tube 5 is inserted into a control rod guide tube or an instrument tube of a reactor fuel assembly of a nuclear power station for irradiation treatment.

The above disclosure is only a preferred embodiment of the present application and should not be taken as limiting the scope of the present application, so that the claims of the present application are covered by the appended claims.