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| Study on the Radiation Shielding Calculation of Therapeutic Room Door of Medical Accelerator by Two Methods |
| ZHAO Xin-Chun1, ZHOU Yan1, CHEN Zhang-Fan1, ZHANG Hui-Min1, XIE Ping1, SU Xu2 |
1. Guangxi Zhuang Autonomous Region Center for Disease Control and Prevention, Nanning 530028 China;
2. National Institute for Radiological Protection, China CDC |
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Abstract Objective To seek simple and reliable optimization calculation method for the radiation shielding thickness of the therapeutic room door of medical accelerator. Methods To calculate radiation shielding thickness of the therapeutic room door of a 15 MV medical accelerator by using simple method and the IAEA Safety Report Series No. 47 method. Results According to the national standard dose limit, Using IAEA 47 report accounting machine door shield thickness for nominal energy ≥ 10 MV accelerator,the total shielding thickness of Gamma ray and leak radiation is greater than that obtained by simple method, but the neuron shielding thickness value is not always greater. For nominal energy < 10 MV accelerator (No shielding neutron),the neuron shielding thickness value is not always greater than that obtained by simple method. Conclusion Because of the complex calculation, many parameters and data (not always accurate) are used; the calculation is easy to make booboo. Thus, we use two Methods to calculate and select a greater value of them to design. The Results show that the radiation shielding is feasible to meet the requirements of national standard in the subsequent accelerator workplace protection acceptance testing.
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Received: 17 November 2013
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