阅读说明：本技术 一种dd中子发生器屏蔽装置 (DD neutron generator shielding device ) 是由 张凯 陈红涛 赵芳 阮锡超 刘世龙 侯龙 龚新宝 刘邢宇 张坤 于 2020-05-26 设计创作，主要内容包括：本发明属于中子发生器屏蔽技术领域,具体涉及一种DD中子发生器屏蔽装置,包括由第一屏蔽体(1)和第二屏蔽体(2)合拢组成的密封的立方体型的屏蔽体,第一屏蔽体(1)内部设置第一空腔(3),第二屏蔽体(2)内部设置第二空腔(4),第一屏蔽体(1)和第二屏蔽体(2)合拢时,第一空腔(3)和第二空腔(4)共同构成设置中子发生器的主体部分的设备舱；中子发生器的主体部分用于通过DD反应产生中子。本发明实现了DD中子发生器在普通环境中的使用,无需建造中子屏蔽厅。对于DD中子产额为1E8的中子发生器,在离屏蔽体外表面1米处的总剂量水平小于1μSv/h,工作人员可在此工作5000小时/年。中子发生器与屏蔽体可以良好结合,维护维修便捷。(The invention belongs to the technical field of neutron generator shielding, and particularly relates to a DD neutron generator shielding device which comprises a sealed cube-type shielding body formed by folding a first shielding body (1) and a second shielding body (2), wherein a first cavity (3) is formed in the first shielding body (1), a second cavity (4) is formed in the second shielding body (2), and when the first shielding body (1) and the second shielding body (2) are folded, the first cavity (3) and the second cavity (4) jointly form an equipment cabin for arranging the main body part of a neutron generator; the main body portion of the neutron generator is used to generate neutrons by the DD reaction. The invention realizes the use of the DD neutron generator in a common environment without building a neutron shielding hall. For the neutron generator with DD neutron yield of 1E8, the total dose level at 1 meter of the external surface of the ion shield is less than 1 μ Sv/h, and the worker can work for 5000 hours/year. The neutron generator and the shielding body can be well combined, and the maintenance is convenient.)

1. A DD neutron generator shielding device is characterized in that: the shielding body is a sealed cubic shielding body formed by folding a first shielding body (1) and a second shielding body (2), a first cavity (3) is arranged inside the first shielding body (1), a second cavity (4) is arranged inside the second shielding body (2), and when the first shielding body (1) and the second shielding body (2) are folded, the first cavity (3) and the second cavity (4) jointly form an equipment cabin for arranging the main body part of a neutron generator; the main body portion of the neutron generator is for generating neutrons by a DD reaction.

2. The DD neutron generator shielding device of claim 1, wherein: the first shielding body (1) and the second shielding body (2) are cubic, and the first cavity (3) and the second cavity (4) are oppositely arranged; the first shielding body (1) and the second shielding body (2) are arranged on a movable platform provided with a sliding rail (5), and the first shielding body (1) and the second shielding body (2) are moved through the sliding rail (5), so that the first shielding body (1) and the second shielding body (2) are folded and separated.

3. The DD neutron generator shielding device of claim 1, wherein: a bracket (6) is arranged in the first cavity (3), and the main body part of the neutron generator is arranged on the bracket (6) through a clamp; the height of the bracket (6) can be adjusted.

4. The DD neutron generator shielding device of claim 1, wherein:

a first neutron channel collimation hole (7) is formed in the first shielding body (1), and a second neutron channel collimation hole (8) is formed in the second shielding body (2); the first neutron channel collimation hole (7) is coaxial with the second neutron channel collimation hole (8);

the device also comprises a boron-containing polyethylene rod for detachably plugging the first neutron channel collimation hole (7) and the second neutron channel collimation hole (8);

the device also comprises a detachable boron-containing polyethylene pipe with different apertures arranged in the first neutron channel collimation hole (7) and the second neutron channel collimation hole (8), and is used for adjusting the apertures of the first neutron channel collimation hole (7) and the second neutron channel collimation hole (8) to realize the function of collimation holes;

the first neutron channel collimation hole (7) and the second neutron channel collimation hole (8) are aligned with a target center position of the main body part of the neutron generator, wherein the target center position generates the neutrons;

and a high-voltage wire threading hole (9) is designed at the upper part of one side of the first shield (1) and used for realizing the DD reaction by accelerating a high-voltage wire which is used for providing high voltage electricity for the main body part of the neutron generator.

5. The DD neutron generator shielding device of claim 1, wherein: a groove (10) is formed in the edge of the first cavity (3), a flange (11) is formed in the edge of the second cavity (4), the groove (10) and the flange (11) can be matched with each other, and sealing connection is achieved when the first shielding body (1) and the second shielding body (2) are folded; the mating surfaces of the recess (10) and the flange (11) reduce the chance of neutron and gamma ray leakage from the gap at the interface of the recess (10) and the flange (11).

6. The DD neutron generator shielding device of claim 1, wherein: the shielding thickness of the first shielding body (1) and the shielding thickness of the second shielding body (2) in each direction are more than or equal to 40.6 cm; the shielding layers of the first shielding body (1) and the second shielding body (2) comprise a boron-containing polyethylene layer, a lead layer and a stainless steel plate from inside to outside; the boron-containing polyethylene layer is used for shielding and absorbing neutrons, the lead layer is used for shielding gamma rays, and the stainless steel plate is used for outer protection.

7. The DD neutron generator shielding device of claim 1, wherein: at the bottom of the first shielding body (1), a plurality of through holes (12) are arranged for the communication of pipelines between the main body part of the neutron generator and the accessory part of the neutron generator; the accessory part of the neutron generator is positioned outside the first shield body (1) and the second shield body (2) and is used for providing a high-voltage power supply, a device power supply, cooling liquid and control signals required by the DD reaction for the main body part; the pipeline is led out from a gap between the bottom of the first shielding body (1) and the platform after passing through the through hole (12) and is connected with the accessory part of the neutron generator.

8. The DD neutron generator shielding device of claim 7, wherein: a conversion connecting plate (13) is arranged on the outer side of the first shielding body (1), a plurality of joints (14) are arranged on the conversion connecting plate (13), the pipelines are connected to the corresponding joints (14), and the equipment of the accessory part of the neutron generator is correspondingly connected with the joints (14).

9. The DD neutron generator shielding device of claim 1, wherein: the outer surfaces of the first shielding body (1) and the second shielding body (2) are provided with handles (15) for manually folding or separating the first shielding body (1) and the second shielding body (2).

10. The DD neutron generator shielding device of claim 1, wherein: the bottom of the platform is provided with a plurality of universal wheels (16) for moving the platform.

Technical Field

The invention belongs to the technical field of neutron generator shielding, and particularly relates to a DD neutron generator shielding device.

Background

For many colleges and universities, scientific research institutions and related enterprises, scientific research and neutron activation analysis and detection and other works need to be carried out by neutrons generated by a neutron generator, and due to strong radiation of neutrons and deep penetrability of fast neutrons, a special shielding workshop needs to be built to shield neutrons, so that radiation influence of neutrons on surrounding environment and personnel is avoided. For neutrons generated by a DD neutron generator with neutron yield of 1E8 and energy of 2.5MeV, the wall and the roof of a factory building need to be subjected to solid pouring by adopting concrete, the thickness of the wall and the roof of the factory building needs more than half a meter to meet the environmental evaluation requirement, the factory building has large floor area, long construction period and high construction cost, and a plurality of units cannot bear the neutrons.

Disclosure of Invention

Aiming at the ring evaluation requirement of a small DD neutron generator, the invention aims to provide a self-shielding device which is small in size, good in shielding effect and convenient to use.

In order to achieve the above object, the technical solution adopted by the present invention is a DD neutron generator shielding device, including a sealed cubic shielding body formed by folding a first shielding body and a second shielding body, wherein a first cavity is arranged inside the first shielding body, a second cavity is arranged inside the second shielding body, and when the first shielding body and the second shielding body are folded, the first cavity and the second cavity jointly form an equipment compartment for arranging a main body part of a neutron generator; the main body portion of the neutron generator is for generating neutrons by a DD reaction.

Further, the first shield and the second shield are cubic, and the first cavity and the second cavity are oppositely arranged; the first shielding body and the second shielding body are arranged on a movable platform provided with a sliding rail, and the first shielding body and the second shielding body can move through the sliding rail, so that the first shielding body and the second shielding body can be folded and separated.

Further, a support is arranged in the first cavity, and the main body part of the neutron generator is arranged on the support through a clamp; the height of the bracket can be adjusted.

Further, in the present invention,

a first neutron channel collimation hole is formed in the first shielding body, and a second neutron channel collimation hole is formed in the second shielding body; the first neutron channel collimation hole is coaxial with the second neutron channel collimation hole;

the device also comprises a boron-containing polyethylene rod for detachably plugging the first neutron channel collimation hole and the second neutron channel collimation hole;

the device also comprises a detachable boron-containing polyethylene pipe with different apertures, which is arranged in the first neutron channel collimation hole and the second neutron channel collimation hole, and is used for adjusting the apertures of the first neutron channel collimation hole and the second neutron channel collimation hole to realize the function of collimation holes;

the first and second neutron channel alignment apertures are aligned with a bullseye location of the body portion of the neutron generator that produces the neutrons;

and a high-voltage wire threading hole is designed at the upper part of one side of the first shield body and is used for realizing the DD reaction by accelerating a high-voltage wire which is used for providing high voltage electricity for the main body part of the neutron generator.

Furthermore, a groove is formed in the edge of the first cavity, a flange is formed in the edge of the second cavity, the groove and the flange can be matched with each other, and sealing connection is achieved when the first shielding body and the second shielding body are folded; the mating surfaces of the recess and the flange reduce the chance of neutron and gamma ray leakage from the gap at the interface of the recess and the flange.

Further, the shielding thickness of the first shielding body and the shielding thickness of the second shielding body in each direction are both more than or equal to 40.6 cm; the shielding layers of the first shielding body and the second shielding body comprise a boron-containing polyethylene layer, a lead layer and a stainless steel plate from inside to outside; the boron-containing polyethylene layer is used for shielding and absorbing neutrons, the lead layer is used for shielding gamma rays, and the stainless steel plate is used for outer protection.

Further, a plurality of through holes are formed in the bottom of the first shielding body and are used for communicating pipelines between the main body part of the neutron generator and the accessory part of the neutron generator; the accessory part of the neutron generator is positioned outside the first shielding body and the second shielding body and is used for providing a high-voltage power supply, a device power supply, cooling liquid and control signals required by the DD reaction for the main body part; the pipeline is led out from a gap between the bottom of the first shielding body and the platform after passing through the through hole and is connected with the accessory part of the neutron generator.

Furthermore, a conversion connecting plate is arranged on the outer side of the first shielding body, a plurality of joints are arranged on the conversion connecting plate, the pipelines are connected to the corresponding joints, and the equipment of the accessory part of the neutron generator is correspondingly connected with the joints.

Further, handles are arranged on the outer surfaces of the first shielding body and the second shielding body and used for manually folding or separating the first shielding body and the second shielding body.

Further, the bottom of the platform is provided with a plurality of universal wheels for moving the platform.

The invention has the beneficial effects that:

1. realizes the use of the DD neutron generator in the common environment (in the common environment)The floor is just needed to be opened in a room, and the floor area is only 2m²) And a neutron shielding hall does not need to be separately built.

2. For the neutron generator with DD neutron yield of 1E8, the total dose level at 1 meter of the outer surface of the ion shield is less than 1 μ Sv/h, where the radiologist can work for 5000 hours/year.

3. The neutron generator and the shielding body can be well combined, and the maintenance is convenient.

Drawings

FIG. 1 is a schematic view of a DD neutron generator shield apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view of a first shield 1 according to an embodiment of the invention;

FIG. 3 is a view from the direction A of FIG. 2;

fig. 4 is a schematic view of a second shield 2 (disposed on a platform) according to an embodiment of the present invention;

FIG. 5 is a view from the direction B of FIG. 2;

FIG. 6 is a schematic view of a transition web 13 according to an embodiment of the present invention;

in the figure: 1-a first shield, 2-a second shield, 3-a first cavity, 4-a second cavity, 5-a slide rail, 6-a support, 7-a first neutron channel collimation hole, 8-a second neutron channel collimation hole, 9-a high-voltage wire threading hole, 10-a groove, 11-a flange, 12-a through hole, 13-a conversion connecting plate, 14-a joint, 15-a handle, 16-a universal wheel and 17-a standby power socket.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1 to 4, the shielding device for a DD neutron generator according to the present invention includes a first shielding body 1 and a second shielding body 2. The first shield 1 and the second shield 2 are folded to form a sealed cubic shield. A first cavity 3 is arranged in the first shielding body 1, a second cavity 4 is arranged in the second shielding body 2, and when the first shielding body 1 and the second shielding body 2 are folded, the first cavity 3 and the second cavity 4 jointly form an equipment cabin provided with a main body part of a neutron generator; the main body part of the neutron generator is used for generating neutrons through DD reaction and comprises an ion source, a vacuum cavity, a high-pressure unit, a molecular pump unit and a gas supply device.

The first shield 1 and the second shield 2 are cubic, and the first cavity 3 and the second cavity 4 are oppositely arranged; the first shielding body 1 and the second shielding body 2 are arranged on a movable platform provided with a sliding rail 5, and the first shielding body 1 and the second shielding body 2 are moved through the sliding rail 5, so that the first shielding body 1 and the second shielding body 2 are folded and separated.

As shown in fig. 3, a bracket 6 is arranged in the first cavity 3, and the main body part of the neutron generator is arranged on the bracket 6 through a clamp; the height of the bracket 6 can be adjusted. The neutron generator is installed or overhauled when the shielding body is in a separated state, and the neutron generator operates when the shielding body is in a closed state. The main body portion of the neutron generator is mounted vertically inside the shield.

A first neutron channel collimation hole 7 is arranged on the first shielding body 1, a second neutron channel collimation hole 8 is arranged on the second shielding body 2, and the aperture is 100 mm; the first neutron channel collimation hole 7 is coaxial with the second neutron channel collimation hole 8;

the device also comprises a boron-containing polyethylene rod for detachably plugging the first neutron channel collimation hole 7 and the second neutron channel collimation hole 8, wherein the boron-containing polyethylene rod is plugged when the first neutron channel collimation hole 7 and the second neutron channel collimation hole 8 are not used and is detached when the first neutron channel collimation hole 7 and the second neutron channel collimation hole 8 are used;

the device also comprises detachable boron-containing polyethylene pipes with different apertures, which are arranged in the first neutron channel collimation hole 7 and the second neutron channel collimation hole 8 and are used for adjusting the apertures of the first neutron channel collimation hole 7 and the second neutron channel collimation hole 8 to realize the function of collimation holes;

the first neutron channel collimation hole 7 and the second neutron channel collimation hole 8 are aligned with the target center position of the main body part of the neutron generator for generating neutrons;

the upper part of one side of the first shielding body 1 is provided with a high-voltage wire threading hole 9 for providing high-voltage electricity for the main part of the neutron generator through an accelerating high-voltage wire, so as to realize DD reaction.

The edge of the first cavity 3 is provided with a groove 10, the edge of the second cavity 4 is provided with a flange 11, the groove 10 and the flange 11 can be matched with each other, and the first shielding body 1 and the second shielding body 2 are in sealed connection when being folded; the mating surfaces of the recess 10 and the flange 11 reduce the chance of neutron and gamma ray leakage from the gap at the interface of the recess 10 and the flange 11.

The shielding thickness of the first shielding body 1 and the second shielding body 2 in each direction is more than or equal to 40.6 cm; the shielding layers of the first shielding body 1 and the second shielding body 2 comprise a boron-containing polyethylene layer, a lead layer and a stainless steel plate from inside to outside; the thickness of the boron-containing polyethylene layer is 40cm, the thickness of the lead layer is 3mm, and the thickness of the stainless steel plate is 3 mm; the boron-containing polyethylene layer is used for shielding and absorbing neutrons, the lead layer is used for shielding gamma rays, and the stainless steel plate is used for outer layer protection and decoration.

The overall dimensions of the first shield 1 and the second shield 2 after being folded are as follows: length × width × height is 2m × 1.2m × 2.4 m.

The size of the cavity (equipment compartment) after the first shielding body 1 and the second shielding body 2 are folded is as follows: length × width × height is 40cm × 30cm × 100 cm.

As shown in fig. 3 and 5, at the bottom of the first shielding body 1, a plurality of through holes 12 are provided for the communication of the pipeline between the main body part of the neutron generator and the accessory part of the neutron generator; the accessory part of the neutron generator is positioned outside the first shield 1 and the second shield 2 and is used for providing a high-voltage power supply, a device power supply, cooling liquid and control signals required by the DD reaction for the main body part; the pipeline is led out from the gap between the bottom of the first shielding body 1 and the platform after passing through the through hole 12 and is connected with the accessory part of the neutron generator.

As shown in fig. 1, 3, 5 and 6, a conversion connection board 13 is provided on the outer side of the first shielding body 1, a plurality of connectors 14 are provided on the conversion connection board 13, the pipelines are connected to the corresponding connectors 14, and the devices of the accessory part of the neutron generator are correspondingly connected to the connectors 14.

The outer surfaces of the first shield 1 and the second shield 2 are provided with handles 15 for manual folding or unfolding of the first shield 1 and the second shield 2.

The bottom of the platform is provided with a plurality of universal wheels 16 for moving the platform.

The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.