Multi-window gamma ray source irradiation device

Abstract

The invention discloses a multi-window gamma source irradiation device, which belongs to the technical field of radiation experiments and comprises an upper shielding box and a lower shielding box. A radioactive source cavity is formed in the upper shielding box, and an irradiation window and a first vertical channel which are communicated with the radioactive source cavity are formed in the side wall and the bottom of the upper shielding box respectively; a storage cavity is formed in the lower shielding box, and a second vertical channel communicated with the storage cavity is formed in the top of the lower shielding box; a first telescopic air cylinder is arranged on the lower side of the lower shielding box, and the telescopic end of the first telescopic air cylinder extends into the containing cavity and is fixedly connected with a radioactive source tray; second telescopic air cylinders are arranged on the outer side walls of the upper shielding box, and attenuators are arranged at the telescopic ends of the second telescopic air cylinders. The beneficial effects of the scheme are that when a radiation source radiation test is carried out, a plurality of radiation windows carry out verification and calibration on a plurality of detection instruments at the same time, and the use efficiency of the radiation source is maximized; the attenuator can be adjusted according to needs, coverage of different dosage rates is achieved, efficiency is improved, and cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of radiation experimental technology, and specifically to a multi-window gamma source irradiation device. Background Technology

[0002] Gamma rays (or gamma rays) are high-energy electromagnetic radiation released during the decay of atomic nuclei or subatomic particles. Due to their extremely high energy, they have strong penetrating power and can penetrate most substances. They are commonly used in various radiation experiments and for the verification and calibration of various radiation monitoring instruments.

[0003] Currently, the design of gamma source irradiation tanks in China adopts a method of placing one radiation source monitoring instrument in a single shielded room and one radiation source device corresponding to one irradiation window. This method can only be used in a single direction and lacks the function of adjusting the radiation dose rate, resulting in low utilization of the radiation source and reducing the verification and calibration efficiency of gamma radiation monitoring instruments. If multiple radiation sources are added and arranged in multiple shielded rooms to generate standard reference radiation fields with different dose rate ranges in order to improve verification efficiency, it will significantly increase construction costs; it will also increase the costs of subsequent replacement, disposal, and decommissioning of radiation sources. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is: how to improve the utilization efficiency of existing radioactive sources and reduce costs.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a multi-window gamma source irradiation device, comprising an upper shielding box and a lower shielding box, both filled with lead material; a radiation source cavity is formed in the upper shielding box, and at least two irradiation windows are formed on the side wall of the upper shielding box corresponding to the position of the radiation source cavity, the irradiation windows being connected to the radiation source cavity through a transverse channel, each transverse channel being provided with a tungsten alloy collimator; a first vertical channel is formed in the upper shielding box, communicating with the radiation source cavity and penetrating the bottom surface of the upper shielding box; a receiving cavity is formed in the lower shielding box, and a second vertical channel is formed in the lower shielding box, communicating with the receiving cavity and penetrating the top surface of the lower shielding box, and the second vertical channel is connected to the first vertical channel; a first telescopic cylinder is provided on the lower side of the lower shielding box, the telescopic end of the first telescopic cylinder passing through the bottom of the lower shielding box and extending into the receiving cavity and being fixedly connected to a radiation source tray; when the telescopic end of the first telescopic cylinder rises, it can push the radiation source tray along the second vertical channel and the first vertical channel to move into the radiation source cavity; On the outer wall of the upper shielding box where the irradiation window is located, there is a second telescopic cylinder corresponding to the irradiation window. The telescopic direction of the second telescopic cylinder is perpendicular to the opening direction of the irradiation window on that side, and the telescopic end is equipped with an attenuator. When the telescopic end of the second telescopic cylinder extends, it can push the attenuator to move to the irradiation window and block the irradiation window.

[0006] The beneficial effects of this solution are as follows: during radiation source irradiation testing, multiple irradiation windows can simultaneously verify and calibrate multiple testing instruments, maximizing the utilization efficiency of the radiation source; the attenuator can be adjusted as needed to achieve coverage of different dose rates, avoiding problems such as deploying multiple radiation sources of different sizes and the need to replace or scrap radiation sources that do not meet verification requirements after attenuation, thus improving efficiency and reducing costs.

[0007] Preferably, the outer wall of the upper shielding box with the irradiation window is fixedly provided with a mounting seat corresponding to the second telescopic cylinder, and the second telescopic cylinder is installed on the upper side of the mounting seat; the upper side of the mounting seat is also provided with a slide rail, the length direction of the slide rail is parallel to the telescopic direction of the second telescopic cylinder, a slider is slidably provided on the slide rail, and the attenuator is fixedly installed on the slider; the telescopic end of the second telescopic cylinder is fixedly connected to the slider.

[0008] The advantages of adopting the above-mentioned preferred solution are: the attenuator is automatically pushed by the second telescopic cylinder to shield or expose the irradiation window, which has a high degree of automation and fast response speed.

[0009] Preferably, the tungsten alloy collimator includes a cylinder, the inner wall of which is provided with internal threads, and a plurality of apertures are provided along the central axis of the cylinder, the outer wall of which is threadedly connected to the inner wall of the cylinder.

[0010] The advantages of adopting the above preferred scheme are: multiple apertures can reduce scattering and constrain the radiation beam; and the constraining effect can be adjusted by moving their installation position via threads.

[0011] Preferably, the number of apertures is five, and their apertures increase sequentially in the direction away from the radiation source cavity.

[0012] The advantages of adopting the above preferred scheme are: the aperture adopts a multi-plate descattering structure, which fully meets the radiation angle requirements.

[0013] Preferably, the top surface of the upper shielding box is provided with a lifting ring.

[0014] The advantages of adopting the above-mentioned preferred solution are that the upper and lower shielding boxes can be moved by lifting rings to adjust their placement.

[0015] Preferably, the bottom surface of the lower shielding box is provided with a column.

[0016] The advantages of adopting the above-mentioned preferred solution are: the support column prevents the entire device from tipping over, raises the foundation height of the lower shielding box, and adapts to the irradiation height requirements.

[0017] Preferably, the piston rod of the first telescopic cylinder is provided with a magnetic ring, and magnetic switches are provided at both the upper and lower ends of the first telescopic cylinder.

[0018] The advantages of adopting the above preferred solution are: it makes it easier for users to understand the status of the first telescopic cylinder and identify whether the radiation source has been pushed out. Attached Figure Description

[0019] Appendix Figure 1 This is a cross-sectional view of the upper and lower shielding boxes of the present invention; Appendix Figure 2 This is a horizontal sectional view of the upper shielding box of the present invention; Appendix Figure 3 This is a three-dimensional schematic diagram of the present invention; Appendix Figure 4 This is a schematic diagram of the tungsten alloy collimator of the present invention; Appendix Figure 5 This is a schematic diagram of the shielded room of the present invention.

[0020] Explanation of reference numerals in the attached diagram: 1. Upper shielding box; 2. Lower shielding box; 3. Irradiation window; 4. Horizontal channel; 5. Tungsten alloy collimator; 6. First vertical channel; 7. Second vertical channel; 8. First telescopic cylinder; 9. Radiation source tray; 10. Second telescopic cylinder; 11. Attenuator; 12. Mounting base; 13. Slide rail; 14. Slider; 15. Lifting ring; 16. Column; 17. Magnetic switch; 18. Shielded room; 19. Shielded door; 20. Detection window; 501. Cylinder body; 502. Aperture. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] Example 1 like Figures 1 to 4As shown, a multi-window gamma source irradiation device includes an upper shielding box 1 and a lower shielding box 2, both filled with lead. The upper shielding box 1 has a radiation source cavity, and at least two irradiation windows 3 are provided on its side wall corresponding to the radiation source cavity. These irradiation windows 3 communicate with the radiation source cavity via transverse channels 4, each containing a tungsten alloy collimator 5. A first vertical channel 6, communicating with the radiation source cavity and penetrating the bottom surface of the upper shielding box 1, is also provided within the upper shielding box 1. The lower shielding box... The lower shielding box 2 has a storage cavity inside, and a second vertical channel 7 that communicates with the storage cavity and extends through the top surface of the lower shielding box 2 is provided inside the lower shielding box 2. The second vertical channel 7 is also connected to the first vertical channel 6. A first telescopic cylinder 8 is provided on the lower side of the lower shielding box 2. The telescopic end of the first telescopic cylinder 8 extends through the bottom of the lower shielding box 2 into the storage cavity and is fixedly connected to a radioactive source tray 9. When the telescopic end of the first telescopic cylinder 8 rises, it can push the radioactive source tray 9 to move along the second vertical channel 7 and the first vertical channel 6 into the radioactive source cavity. On the outer wall of the upper shielding box 1 where the irradiation window 3 is opened, there is a second telescopic cylinder 10 corresponding to the irradiation window 3. The telescopic direction of the second telescopic cylinder 10 is perpendicular to the opening direction of the irradiation window 3 on that side, and the telescopic end is provided with a plurality of attenuators 11. When the telescopic end of the second telescopic cylinder 10 extends, it can push the attenuator 11 to move to the irradiation window 3 and block the irradiation window 3.

[0023] In the field of radiation experimental technology, radiation sources have a wide range of applications. Different radiation sources, such as gamma sources and neutron sources, are selected according to experimental needs. They can be used for the calibration and verification of various radiation detection equipment, as well as for the interference immunity and radiation resistance testing of various electronic products (such as neutron probes, gamma probes, cameras, etc.) under radiation environments. Current technology typically employs a single radiation source monitoring instrument placed in a shielded room, with one radiation source corresponding to one illumination window. This method allows for use in only one direction, resulting in low utilization of the radiation source and lacking the ability to adjust its radiation dose rate.

[0024] In this embodiment, the upper shielding box 1 and the lower shielding box 2 are fixedly connected; the number of irradiation windows 3 is four, arranged at a 90° angle (other numbers and angles can also be selected according to experimental needs). In the initial state, the radiation source is placed on the radiation source tray 9 and located in the storage cavity of the lower shielding box 2. Each of the second telescopic cylinders 10 pushes the attenuator 11 to block each irradiation window 3; the attenuator 11 and the lead material in the upper shielding box 1 and the lower shielding box 2 are used to prevent radiation leakage.

[0025] During the radiation source irradiation test, the first telescopic cylinder 8 operates, pushing the radiation source tray 9 upward and moving it along the second vertical channel 7 and the first vertical channel 6 to the position of the radiation source cavity. The gamma rays from the radiation source pass through the transverse channel 4. The tungsten alloy collimator 5 in the transverse channel 4 controls the irradiation range of the rays and guides the rays to propagate along a specific route. Finally, the gamma rays are emitted from the irradiation window 3.

[0026] The attenuator 11 is a tungsten alloy block that functions to shield radiation. Its cross-sectional area is larger than that of the irradiation window 3, effectively blocking it. The thicker the attenuator 11, the better the shielding and attenuation effect. Based on the required radiation dose rate for each irradiation window 3, operators pre-select tungsten alloy blocks of different thicknesses and install them on the second telescopic cylinder 10. The second telescopic cylinder 10 moves according to a pre-programmed sequence, either exposing the attenuator 11 to the irradiation window 3 or continuing to block it, ultimately achieving different radiation dose rates at the irradiation window 3. This allows for simultaneous radiation irradiation experiments in multiple directions and adjustment of the radiation dose rate in each direction; it improves the utilization rate of the radiation source, fully meets various experimental needs, and reduces experimental costs and subsequent issues related to radiation source recovery and disposal.

[0027] Based on this embodiment, such as Figure 5 As shown, the device is placed in an experimental room. Multiple shielded rooms 18 are arranged around the room. The shielded rooms 18 are connected to the experimental room through detection windows 20. The position of the detection windows 20 corresponds to the irradiation window 3 of the shielding box 1. A shielding door 19 is also provided on the outside of the shielded room 18. The shielding door 19 is equipped with an electric latch. The electric latch and the second telescopic cylinder 10 are both equipped with position sensors, and the position sensors are electrically connected to each other. The electric latch can only be opened when the second telescopic cylinder 10 extends and the attenuator 11 blocks the irradiation window 3 to prevent radiation leakage.

[0028] Example 2 like Figures 1 to 3 As shown, on the outer wall of the upper shielding box 1 where the irradiation window 3 is opened, there are fixed mounting seats 12 corresponding to the second telescopic cylinders 10. The second telescopic cylinders 10 are installed on the upper side of the mounting seats 12. The upper side of the mounting seats 12 is also provided with a slide rail 13. The length direction of the slide rail 13 is parallel to the telescopic direction of the second telescopic cylinders 10. A slider 14 is slidably mounted on the slide rail 13. The attenuator 11 is fixedly installed on the slider 14. The telescopic end of the second telescopic cylinder 10 is fixedly connected to the slider 14.

[0029] In this embodiment, the second telescopic cylinder 10 pushes the slider 14, the slider 14 slides on the slide rail 13, and drives the attenuator 11 to move to the irradiation window 3. The slide rail 13 is used for guidance to prevent the attenuator 11 from deviating and failing to properly shield the irradiation window 3.

[0030] As a parallel technical solution in this embodiment, multiple (one row) attenuators 11 of different thicknesses can be arranged on the slider 14 along the length direction of the slide rail 13. The specific extension stroke of the second telescopic cylinder 10 can be adjusted according to experimental needs to push different attenuators 11 to block the irradiation window 3 in order to obtain different radiation dose rates.

[0031] As a parallel technical solution in this embodiment, a placement groove can also be opened on the top surface of the slider 14. Multiple parallel storage grooves can be opened on one side wall perpendicular to the length direction of the slide rail 13. Each storage groove can hold a tungsten alloy sheet of different thicknesses. Each storage groove is also equipped with an electric telescopic rod, with the telescopic end of the electric telescopic rod pointing towards the placement groove. When attenuators 11 of different thicknesses are needed, the electric telescopic rod is controlled to extend and push out the tungsten alloy sheet, which then falls into the placement groove. The thickness of multiple tungsten alloy sheets is stacked to achieve adjustable shielding effect.

[0032] like Figure 4 As shown, the tungsten alloy collimator 5 includes a cylindrical body 501. The inner wall of the cylindrical body 501 is provided with an internal thread. At least one aperture 502 is provided inside the cylindrical body 501 along its central axis. The outer wall of the aperture 502 is threadedly connected to the inner wall of the cylindrical body 501.

[0033] In this embodiment, the aperture 502 refers to an entity in the optical system that restricts the light beam, with a hole in the center for the light to pass through. The aperture 502 can reduce the scattering of radiation rays and constrain the direction of the radiation beam; and the outer circumference of the aperture 502 is provided with external threads, which are threaded to the inner side wall of the cylinder 501. By rotating the aperture 502, its position within the cylinder 501 can be helically moved, thereby adjusting the radiation beam constraint effect.

[0034] like Figure 4 As shown, there are five apertures 502, and their apertures increase sequentially in the direction away from the radiation source cavity.

[0035] In this embodiment, Figure 4 The corresponding apertures 502 in the middle Figure 1 The cylinders of the tungsten alloy collimator 5; the aperture 502 is an aperture diaphragm, and multiple apertures 502 can form a multi-plate descattering structure. The design of its radiation angle should meet the requirement that the diameter of the radiation beam cross section is not less than 600 mm when the distance from the radiation source is 3 m, which complies with the requirements of GB / T 12162.

[0036] like Figure 3 As shown, the top surface of the upper shielding box 1 is provided with a lifting ring 15.

[0037] In this embodiment, the upper shielding box 1 and the lower shielding box 2 can be moved by lifting ring 15 to adjust their placement.

[0038] like Figure 3 As shown, the bottom surface of the lower shielding box 2 is provided with a column 16.

[0039] In this embodiment, the lower end of the column 16 is fixed to the ground with expansion bolts to prevent the entire device from tipping over; and it can raise the base height of the lower shielding box 2 to meet the requirements of the irradiation height.

[0040] like Figure 1 As shown, the piston rod of the first telescopic cylinder 8 is provided with a magnetic ring, and magnetic switches 17 are provided at both the upper and lower ends of the first telescopic cylinder 8.

[0041] In this embodiment, a magnetic ring is installed on the piston rod of the first telescopic cylinder 8. When the piston rod of the first telescopic cylinder 8 moves, the magnetic ring also moves accordingly. Magnetic switches 17 are installed at two fixed positions above and below the first telescopic cylinder 8. When the magnetic ring approaches the magnetic switch 17, the magnetic switch 17 outputs a signal, thereby detecting the position of the cylinder piston. This allows the user to understand the status of the first telescopic cylinder 8 and identify whether the radiation source tray 9 has been pushed out.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A multi-window gamma source irradiation device, characterized in that, It includes an upper shielding box (1) and a lower shielding box (2), both of which are filled with lead material; the upper shielding box (1) has a radiation source cavity, and at least two irradiation windows (3) are provided on the side wall of the upper shielding box (1) corresponding to the position of the radiation source cavity. The irradiation windows (3) are connected to the radiation source cavity through a transverse channel (4), and each transverse channel (4) is provided with a tungsten alloy collimator (5); the upper shielding box (1) has a first vertical channel (6) that is connected to the radiation source cavity and penetrates the bottom surface of the upper shielding box (1); the lower shielding box (2) has a receiving... The lower shielding box (2) has a second vertical channel (7) that communicates with the storage cavity and penetrates the top surface of the lower shielding box (2), and the second vertical channel (7) communicates with the first vertical channel (6); the lower side of the lower shielding box (2) is provided with a first telescopic cylinder (8), the telescopic end of the first telescopic cylinder (8) passes through the bottom of the lower shielding box (2) and extends into the storage cavity and is fixedly connected to a radioactive source tray (9); when the telescopic end of the first telescopic cylinder (8) rises, it can push the radioactive source tray (9) to move along the second vertical channel (7) and the first vertical channel (6) into the radioactive source cavity; On the outer wall of the upper shielding box (1) where the irradiation window (3) is opened, there is a second telescopic cylinder (10) corresponding to the irradiation window (3) one by one. The telescopic direction of the second telescopic cylinder (10) is perpendicular to the opening direction of the irradiation window (3) on that side, and the telescopic end is provided with an attenuator (11). When the telescopic end of the second telescopic cylinder (10) extends, it can push the attenuator (11) to move to the irradiation window (3) and block the irradiation window (3).

2. The multi-window gamma source irradiation device according to claim 1, characterized in that, On the outer wall of the upper shielding box (1) with the irradiation window (3), there are fixed mounting seats (12) corresponding to the second telescopic cylinder (10). The second telescopic cylinder (10) is installed on the upper side of the mounting seat (12). The upper side of the mounting seat (12) is also provided with a slide rail (13). The length direction of the slide rail (13) is parallel to the telescopic direction of the second telescopic cylinder (10). A slider (14) is slidably provided on the slide rail (13). The attenuator (11) is fixedly installed on the slider (14). The telescopic end of the second telescopic cylinder (10) is fixedly connected to the slider (14).

3. The multi-window gamma source irradiation device according to claim 1, characterized in that, The tungsten alloy collimator (5) includes a cylindrical body (501), the inner wall of the cylindrical body (501) is provided with an internal thread, and a plurality of apertures (502) are provided along the central axis inside the cylindrical body (501), the outer wall of the apertures (502) is threadedly connected to the inner wall of the cylindrical body (501).

4. The multi-window gamma source irradiation device according to claim 3, characterized in that, The number of apertures (502) is five, and their apertures increase sequentially in the direction away from the radiation source cavity.

5. The multi-window gamma source irradiation device according to claim 1, characterized in that, The top surface of the upper shielding box (1) is provided with a lifting ring (15).

6. The multi-window gamma source irradiation device according to claim 1, characterized in that, The bottom surface of the lower shielding box (2) is provided with a column (16).

7. The multi-window gamma source irradiation device according to claim 1, characterized in that, The piston rod of the first telescopic cylinder (8) is provided with a magnetic ring, and magnetic switches (17) are provided at both the upper and lower ends of the first telescopic cylinder (8).

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