| Yu Lang,Yang Bo,Sun Xiansong,Feng Zechen,Qiu Jie.Comparison of Chinese and international radiation shielding standards in application for after loading bunker shielding design[J].Chinese Journal of Radiological Medicine and Protection,2021,41(7):529-533 |
| Comparison of Chinese and international radiation shielding standards in application for after loading bunker shielding design |
| Received:December 28, 2020 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.07.010 |
| KeyWords:Afterloader 192Ir source Shielding Design Instantaneous dose-equivalent rate Standard |
| FundProject:“十三五”国家重点研发计划项目（2016YFC0105206，2016YFC0105207） |
| Author Name | Affiliation | E-mail | | Yu Lang | Department of Radiation Oncology, Beijing Center for Radiotherapy Quality Control, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College Hospital (PUMCH), Beijing 100730, China | | | Yang Bo | Department of Radiation Oncology, Beijing Center for Radiotherapy Quality Control, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College Hospital (PUMCH), Beijing 100730, China | | | Sun Xiansong | Department of Radiation Oncology, Beijing Center for Radiotherapy Quality Control, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College Hospital (PUMCH), Beijing 100730, China | | | Feng Zechen | Institute of Radiological Protection, Beijing Centers for Disease Prevention and Control, Beijing 100013, China | | | Qiu Jie | Department of Radiation Oncology, Beijing Center for Radiotherapy Quality Control, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College Hospital (PUMCH), Beijing 100730, China | ww_qj@139.com |
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| Abstract:: |
| Objective To compare the calculation result and analyzes the reasons for their differences so as to provide reference for the revision and improvement of the current national standards on radiation shielding design for the room of brachytherapy. Methods For the initial activity 10 Ci (1 Ci=3.7×1010 Bq) of radioactive sources, the shielding schemes of brachytherapy room were designed in accordance with UK Institnte of Physics and Engineering in Medicine(IPEM) Report 75, USA NCRP Report 151 and the national standard GBZ/T 201.3-2014, respectively. The differences in shielding limits, occupancy factors and other relevant factors are compared in detail. Results The annual exposure time in a typical brachytherpy room was about 330 h. The point-specific concrete thickness were 70, 65, 61, 70, 50 cm as required by NCRP Report 151, 41, 43, 30, 40, 39 cm by IREM regulations and 84, 79, 46, 88, 39 cm by GBZ/T 201.3,respectively. The concerned concrete shielding thickness calculated under the GBZ/T 201.3-2014 was generally thicker, with lesser difference from NCRP Report 151 result, whereas that from the IPEM75 report was thinnest. The equivalent lead shielding thicknesses of the protective doors calculated using the three method are 1.170, 0.854 and 1.040 cm,respectively. Conclusions The shielding thickness calculated using the calculation method and evaluation index recommended by the current Chinese shielding standards for brachytherapy bunker is similar to that reported in NCRP151, but is conservative. In particular, the evaluation index of instantaneous dose equivalent rate required by the current national standards and the relative conservative value of occupancy factor will significantly increase the shielding thickness required by the main shielding area. |
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