CN-121978745-A - Gamma-ray irradiation device for calibrating nuclide identifier

CN121978745ACN 121978745 ACN121978745 ACN 121978745ACN-121978745-A

Abstract

The invention discloses a gamma-ray irradiation device for calibrating a nuclide identifier, which is characterized by comprising a radioactive source shielding container, a radioactive source selecting device, a gas path opening and closing device, a pneumatic transmission air inlet pipeline and a radioactive source pneumatic transmission channel, wherein the radioactive source selecting device comprises a radioactive source rotary table, a control motor, a rotary table origin and a radioactive source bearing structure, an output shaft of the control motor is fixedly connected with the end part of a central shaft of the radioactive source rotary table, the radioactive source rotary table is provided with a plurality of source positions, the radioactive source bearing structure is arranged in the source positions, the radioactive source bearing structure is used for placing radioactive sources, the rotary table origin is used for calibrating and feeding back initial positions, the radioactive source shielding container is sleeved outside the radioactive source rotary table and used for shielding radioactive rays generated by the radioactive sources in the radioactive source rotary table, and the pneumatic transmission air inlet pipeline is arranged below the radioactive source rotary table and is communicated with the radioactive source rotary table.

Inventors

WANG YUQING
WEI YINGJING
LI ZHIGANG
TANG ZHIHUI
FANG DENGFU
DUAN JIAYU
CHEN SHUANGQIANG
LIU XINHAO
FENG MEI
ZHANG TINGTING

Assignees

中国辐射防护研究院

Dates

Publication Date: 20260505
Application Date: 20260109

Claims (10)

1. The gamma-ray irradiation device for calibrating a nuclide identifier is characterized by comprising a radioactive source shielding container (1), a radioactive source selecting device (2), a gas path opening and closing device (3), a pneumatic transmission air inlet pipeline (4) and a radioactive source pneumatic transmission channel (5), wherein: The radioactive source selecting device (2) comprises a radioactive source rotary table (201), a control motor (202), a rotary table origin (203) and a radioactive source bearing structure (204), wherein an output shaft of the control motor (202) is fixedly connected with the end part of the central shaft of the radioactive source rotary table (201), the radioactive source rotary table (201) is provided with a plurality of source positions, the radioactive source bearing structure (204) is arranged in the source positions, the radioactive source bearing structure (204) is used for placing a radioactive source, and the rotary table origin (203) is used for calibrating and feeding back an initial position; The radioactive source shielding container (1) is sleeved outside the radioactive source turntable (201) and is used for shielding radioactive rays generated by a radioactive source in the radioactive source turntable (201); the pneumatic transmission air inlet pipeline (4) is positioned below the radioactive source turntable (201), and the pneumatic transmission air inlet pipeline (4) is communicated with the radioactive source turntable (201); The radioactive source pneumatic transmission channel (5) is positioned above the radioactive source turntable (201), the radioactive source pneumatic transmission channel (5) passes through the radioactive source shielding container (1) to be communicated with the radioactive source turntable (201), and the pneumatic transmission air inlet pipeline (4) and the central axis of the radioactive source pneumatic transmission channel (5) are in the same straight line; when the pneumatic transmission air inlet pipeline (4) is filled with high-pressure air, the air in the pneumatic transmission air inlet pipeline (4) is pushed to move the radioactive source bearing structure (204) in the radioactive source turntable (201) to the top along the radioactive source pneumatic transmission channel (5), so that the radioactive source can be conveniently irradiated; The gas circuit opening and closing device (3) comprises a gas circuit opening and closing electric pushing cylinder (301), an electric pushing cylinder position sensor (302), a gas circuit opening and closing pushing cylinder gripper (303) and lifting pipes (304), wherein the two lifting pipes (304) are respectively positioned in the pneumatic transmission channel (5) of the radioactive source and the pneumatic transmission air inlet pipeline (4), the two lifting pipes (304) are respectively in sliding connection with the pneumatic transmission channel (5) of the radioactive source and the pneumatic transmission air inlet pipeline (4), so that the lifting pipes (304) can slide in the pneumatic transmission channel (5) of the radioactive source or the pneumatic transmission air inlet pipeline (4), and the end part, close to the radioactive source turntable (201), of the lifting pipe (304) can be in butt joint with the radioactive source turntable (201); The gas circuit opening and closing electric pushing cylinder comprises a gas circuit opening and closing electric pushing cylinder (301), wherein two symmetrically arranged connecting rods are rotatably arranged at the output end of the gas circuit opening and closing electric pushing cylinder (301), two gas circuit opening and closing pushing cylinder grippers (303) are arranged, one end of each connecting rod, far away from the gas circuit opening and closing electric pushing cylinder (301), is respectively in rotary connection with one gas circuit opening and closing pushing cylinder gripper (303), the two gas circuit opening and closing pushing cylinder grippers (303) are respectively inserted into two lifting pipes (304), when the gas circuit opening and closing electric pushing cylinder (301) is opened, the gas circuit opening and closing electric pushing cylinder (301) pushes the connecting rods, the gas circuit opening and closing pushing cylinder gripper (303) drives the lifting pipes (304) to be far away from a radioactive source turntable (201) so that the radioactive source turntable (201) can rotate, and when the gas circuit opening and closing electric pushing cylinder (301) is closed, the lifting pipes (304) are abutted against the radioactive source turntable (201) to fix the radioactive source turntable (201).
2. The gamma-ray irradiation device for calibrating a nuclide identifier according to claim 1, wherein a lifting interface sealing ring (305) is fixedly arranged at a contact position of the lifting tube (304) and the radioactive source turntable (201).
3. The gamma-ray irradiation device for calibrating a nuclide identifier according to claim 1, further comprising an irradiation device housing (6), wherein the radioactive source shielding container (1), the radioactive source selecting device (2) and the gas path opening and closing device (3) are all arranged inside the irradiation device housing (6), the pneumatic transmission air inlet pipeline (4) penetrates through the bottom of the irradiation device housing (6), and the radioactive source pneumatic transmission channel (5) penetrates through the top of the irradiation device housing (6).
4. A gamma-ray irradiation device for calibration of a nuclear species identifier according to claim 3, wherein the bottom of the irradiation device housing (6) is rotatably provided with a pulley (601).
5. A gamma-ray irradiation device for nuclide identifier calibration as in claim 1 wherein at least one of the plurality of source positions of the radioactive source carousel (201) is free of radioactive sources.
6. The gamma-ray irradiation device for calibrating a nuclide identifier according to claim 1, wherein a part of the gas path opening and closing pushing cylinder gripper (303) inserted into the lifting pipe (304) is provided with a protrusion, the protrusion and the lifting pipe (304) form a clamping connection, and the connection between the gas path opening and closing pushing cylinder gripper (303) and the lifting pipe (304) is enhanced.
7. A gamma-ray irradiation device for calibration of a nuclear species identifier according to claim 3, characterized in that the part of the radioactive source pneumatic transmission channel (5) located outside the irradiation device housing (6) and connected to the irradiation device housing (6) is provided with a connection flange for increasing the connection rigidity of the radioactive source pneumatic transmission channel (5) and the irradiation device housing (6), and the part of the radioactive source pneumatic transmission channel (5) located outside the irradiation device housing (6) is provided with a viewing window (503).
8. The gamma-ray irradiation device for calibrating a nuclide identifier according to claim 1, wherein an air hole (501) is formed in the top of the radioactive source pneumatic transmission channel (5).
9. The gamma-ray irradiation device for calibrating a nuclide identifier according to claim 1, wherein a silica gel pad (502) is fixedly arranged on the inner side of the top of the radioactive source pneumatic transmission channel (5).
10. A gamma-ray irradiation device for calibration of a nuclear species identifier according to claim 1, wherein the top of the radioactive source pneumatic transmission channel (5) is detachably provided with a steel shield (504).

Description

Gamma-ray irradiation device for calibrating nuclide identifier Technical Field The invention relates to the field of gamma-ray irradiation, in particular to a gamma-ray irradiation device for calibrating a nuclide identifier. Background The use of nuclear technology is becoming an increasingly critical support for industrial production, public safety and everyday life. However, as the use of nuclear energy increases, the risk of nuclear accidents also increases. Therefore, nuclear energy safety has become a focus of public attention, and research on monitoring and identification technology of nuclear materials has become a hot spot in the scientific research field. The portable nuclide identifier has a key effect in the aspect of detecting radioactive substances, can rapidly locate and qualify radioactive materials and provide instant information for emergency response, so that an assistance commander can make a precise decision, and the accident handling efficiency is remarkably improved. The method is applied to the fields of nuclear laboratories, nuclear medicine, anti-terrorism, customs inspection, mineral resource development, waste metal recovery, building material radioactivity detection and the like. The portable nuclide identifier needs to be calibrated regularly to ensure long-term stability of the performance. According to the requirements of the hand-held radiation monitor calibration Specification for detecting and identifying radionuclides (JF 1687-2018), the nuclide identification rate of a nuclide identifier needs to be measured, including the measurement of a single radionuclide identification rate and a mixed radionuclide identification rate. The calibration standard recommends that gamma radioactive reference source nuclides for nuclide identification measurement be 241Am、60Co、137Cs、226Ra、232Th、133 Ba and the like, and the activity range be 10 4~107 Bq. The radioactive source in the activity range is of a V type and an exemption level, so that the damage to experimental staff is small, but a certain risk still exists in long-term contact. At present, when the nuclide identifier is calibrated, no gamma-ray irradiation device is specially calibrated and used for the nuclide identifier, an experimenter is usually required to manually take the radioactive source, and although the radioactive source is in a V type and an exemption level, the damage to the experimenter is small, and a certain risk still exists in long-term contact. Therefore, the invention provides the gamma-ray irradiation device for calibrating the nuclide identifier, which can prevent the experimenter from contacting with the radionuclide in a short distance and reduce the working dose of the experimenter. Disclosure of Invention To achieve the above and other related objects, the present invention discloses a gamma-ray irradiation device for calibrating a nuclide identifier, comprising a radioactive source shielding container, a radioactive source selecting device, a gas path opening and closing device, a pneumatic transmission air inlet pipe and a radioactive source pneumatic transmission channel, wherein: The radioactive source selecting device comprises a radioactive source rotary table, a control motor, a rotary table origin, a radioactive source bearing structure and a central shaft, wherein the central shaft is positioned at the central position of the radioactive source rotary table and is fixedly connected with the radioactive source rotary table, the central shaft is used for driving the radioactive source rotary table to rotate, and an output shaft of the control motor is fixedly connected with the end part of the central shaft; The radioactive source shielding container is sleeved outside the radioactive source turntable and is used for shielding radioactive rays generated by the radioactive source; the pneumatic transmission air inlet pipeline is positioned below the radioactive source turntable and is communicated with the source position of the radioactive source turntable; The radioactive source pneumatic transmission channel is positioned above the radioactive source turntable and is communicated with the source phase of the radioactive source turntable; when the pneumatic transmission air inlet pipeline is filled with high-pressure gas, the gas in the pneumatic transmission air inlet pipeline is pushed, and a radioactive source bearing structure in the radioactive source turntable is moved upwards to the top along the pneumatic transmission channel of the radioactive source, so that the radioactive source can be conveniently irradiated; The gas circuit opening and closing device comprises a gas circuit opening and closing electric pushing cylinder, an electric pushing cylinder position sensor, a gas circuit opening and closing pushing cylinder gripper and two lifting pipes, wherein the two lifting pipes are respectively positioned in the pneumatic transmission channel of the radioactive source and the pneu