| Shan Chao,Xu Kun,Tian Yuan,Lu Xiaoming.Shielding design scheme for proton therapy treatment rooms: Comparison between Chinese and international radiation shielding standards for radiotherapy facilities[J].Chinese Journal of Radiological Medicine and Protection,2020,40(12):911-918 |
| Shielding design scheme for proton therapy treatment rooms: Comparison between Chinese and international radiation shielding standards for radiotherapy facilities |
| Received:July 07, 2020 |
| DOI：10.3760/cma.j.issn.0254-5098.2020.12.004 |
| KeyWords:Proton therapy Radiation protection Shielding design Standard |
| FundProject: |
| Author Name | Affiliation | E-mail | | Shan Chao | Department of Radiation Oncology, Hefei Ion Medical Center, Hefei 230038, China | | | Xu Kun | Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China | | | Tian Yuan | Department of Radiation Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences(CAMS) and Peking Union Medical College(PUMC), Beijing 100021, China | | | Lu Xiaoming | Ion Medical Research Institute, University of Science and Technology of China, Hefei 230026, China | hmlu@himc.org.cn |
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| Abstract:: |
| Objective To explore the impacts of different foreign and domestic radiation shielding standards on the shielding design of proton therapy treatment rooms. Methods A multi-room proton therapy center was taken as an example. Different shielding schemes were determined for the center according to different radiation shielding limits stipulated in NCRP Report No.151, the Singapore Radiation Protection Act, the UK Approved Code of Practice and Guidance, and the national standard in China GBZ/T 201.5-2015. Afterwards, the thickness of the walls between two adjacent treatment rooms and the walls between the control room and its adjacent treatment room were compared. Meanwhile, the differences among the four radiation shielding schemes were discussed in terms of effective usable areas and the construction cost of concrete on the premise that each room's design size remains the same in these four schemes. Results The calculation result revealed that the concrete shielding walls (A-F) of the treatment rooms determined according to NCRP Report No.151 were the thinnest. In contrast, the walls of the treatment rooms determined according to GBZ/T 201.5-2015 were the thickest, among which the wall between the two adjacent gantry rooms was more than doubled in thickness. As a result, the total usable area of the four treatment rooms decreased by 17.69%, and the total construction cost increased by 440 thousand yuan. Conclusions Compared with other regulations and standards listed in this paper, the current national standard in China is the strictest in terms of radiation shielding criteria. This will notably increase the shielding wall thickness and will have certain impacts on the development of domestic proton therapy technology and the possible upgrade to ultra-high dose rate treatment mode in the future. Therefore, it is recommended that the threshold of the instantaneous dose rate (IDR) should be appropriate improved and the limit of the time-averaged dose rate (TADR) that can better reflect actual treatment conditions be added by referring to the standards and experience of countries with mature proton therapy technologies. In this way, the shielding for proton therapy treatment rooms can be designed optimally. |
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