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| Special Considerations about Designing and Protection Measurements of Radiotherapy Facilities |
| GUO Zhao-hui, LIU Li-ming, LIU Ya, CHENG Jin-sheng |
| National Institute for Radiological Protection, China CDC, Beijing 100088 China |
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Abstract Objective Some radiation facilities are designed with little shielding in the ceiling above the accelerator. This paper is to calculate and mesure skyshine and side-scattered for these accelerator facilities, and to study the caution required for the calculation and measurement. Methods The examples are based on two medical linear accelerator room with little shielding in the ceiling. To compare skyshine and side-scattered measurements with values calculated using the techniques presented in NCRP Report No. 151. Results There is difference between the calculated and measured values of skyshine. It gets an rough order of magnitude between the calculation and measurement of side-scattered. Conclusion For radiation therapy rooms with thin roof barriers, we should consider skyshine and side-scattered. The calculation equation of skyshine given by NCRP Report No. 151 exists limitation.
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Received: 27 May 2016
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