关键词: 热释光剂量计, 脉冲X射线发生装置, 放射防护检测与评价

Abstract: Objective The feasibility of using thermoluminescence dosimeter for radiation protection detection and evaluation of industrial pulsed X-ray generator is discussed. Methods Arrange thermoluminescence dosimeters and AT1123 X/γ radiation dose rate meters at key points in the workplace of the pulsed X-ray generator.Trigger the exposure of the pulsed X-ray generator, and read the test results of the AT1123 X/γ radiation dose rate meters on site.The thermoluminescence dosimeters are taken back to the laboratory for reading. Result By thermoluminescence method, the cumulative doses of the no.1 pulsed X-ray generator are 620.9 μSv, 71.3 μSv and 22.5 μSv at 1 m, 3 m and 5.6 m from the center of the radiation beam axis, respectively. The highest cumulative dose is 199.5 μSv at 1.0 m on the left and right sides of the pulsed X-ray tube (near the target) and 14.6 μSv at 1 m behind the tube.The cumulative dose of 4 exposures outside the shielding wall is between 8.2 μSv and 1.0 μSv. The radiation dose distribution around the X-ray tube of no. 2 pulsed X-ray generator is basically consistent with that of No.1 generator. AT1123 X/γ radiation dose rate meter shows that the dose equivalent rate is 18.8 mSv/h around the center 1 m of the beam axis at the instant of exposure. Conclusion The detection results obtained by the thermoluminescence method are in good agreement with the theoretically calculated values, which can meet the requirements of radiation protection testing for industrial pulse X-ray generator. The test result evaluation method adopted in this paper can give a quantitative evaluation conclusion on the radiation protection effect of the pulse X-ray generator workplace, and the evaluation method has certain feasibility.

Key words: Thermoluminescence dosimeter, Pulsed X-ray generator, Radiation protection detection and evaluation