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| Discussion on some key issues in radiation environmental impact assessment of high energy proton therapy system |
| JIN Xiao, YAN Yuan, HAN Chuncai |
| China Institute of Atomic Energy, Beijing 102413 China |
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Abstract Objective To analyze some key issues in radiation environmental impact assessment of high energy proton therapy system and present the proposals for the reference of environmental impact assessment of such nuclear technology utilization activities.Methods Taking a recent radiation environmental impact of proton therapy system as a case study, the key issues and corresponding proposals were present from the aspects of radiation pollution source items, radiation shielding calculation and evaluation, induced radioactivity analysis, and exposure dose calculation of pesonnel.Results In radiation environmental impact assessment of proton therapy system, more emphasis should be placed on the entrance of the inner maze wall and gantry area of the gantry room that lies next to the rotating beam therapy room when determining the dose rate limits of area outside the shielding of radiation workplace. In addition to common factors such as air, cooling water, structure items, concrete walls, soil and underground water, it is also important to pay attention to patient-induced radioactivity in treatment room when analyzing the induced activity. Besides the external irradiation dose, the dose contribution of induced radioactivity in treatment room should be taken into account when estimating the exposure dose of the radiation workers.Conclusion As a large-scale medical equipment, environmental impact assessment of high energy proton therapy system should be done scientifically and objectively, taking various influence factors into consideration.
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Received: 11 June 2019
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