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| Measurement and protection evaluation of pulsed X-ray radiation field induced by a certain equipment |
| LI Dawei, JI Yunlong, ZHOU Hongmei, XIE Xiangdong, WANG Changzhen, DONG Guofu, ZHAO Xuelong, WANG Qi, NING Jing |
| Institute of Radiation Medicine, Academy of Military Medicine Sciences, Academy of Military Sciences, Beijing 100850 China |
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Abstract Objective To investigate the ionizing radiation levels of pulsed X-ray at different positions under experimental conditions of a certain equipment, and to propose appropriate protective suggestions.Methods Thermoluminescence measurement method is adopted. Thermoluminescence dosimeters were set up in different directions and distances around the equipment cabin, and were measured after a certain amount of pulsed radiation was accumulated. X-ray and gamma ray ionizing chamber dosimeter (FJ-347A) was used for real-time measurement of the dose rate of ionizing radiation at different distances. Recommendations on radiation protection at different working positions were made according to the individual dose limits for occupational exposure personnel and members of the public stipulated in the “Basic standards for protection against ionizing radiation and for the safety of radiation sources” (GB 18871—2002).Results Thermoluminescence dosimeters received 3000 radiation pulses accumulatively. The dose received by the thermoluminescence dosimeters on the outside wall of the equipment cabin ranged from 0.01 mGy to 8.98 mGy, the roof ranged from 0.01 mGy to 15.67 mGy, 1～12 meters from the outside wall ranged from 0.01 mGy to 2.18 mGy, and work stations was 0 mGy. Under the working condition, the range of air kerma rate measured by the X-ray dosimeter between 1～20 meters from the outside wall of the equipment cabin was 0.26～16 mGy/h.Conclusion The results of thermoluminescence dosimeters and ionizing chamber dosimeter are basically consistent, indicating that both methods can be used for pulsed X-ray measurement. In working condition, the radiation dose rates in short distance outside the cabin of the equipment are relatively high. Radiation protection requirements can be met by taking safety protection measures or limiting the workload of personnel.
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Received: 18 September 2019
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