Influence of dose rate reference control level on the design of accelerator shielding

VernacularTitle:剂量率参考控制水平对加速器屏蔽设计的影响
Author: Yaqin ZHENG ; Yajun KANG ; Xuegang CHU ; Fang GUO
Publication Type:Journal Article
Keywords: Accelerator; Shielding; Dose rate reference control level
From: Chinese Journal of Radiological Medicine and Protection 2015;35(2):139-141
CountryChina
Language:Chinese
Abstract: Objective To explore the influence of dose rate reference control level on the design of accelerator shielding.Methods According to the standards of GBZ 126-2011,GBZ/T 201.1-2007 and GBZ/T 201.2-2011,two different shielding calculation methods,based on the dose rate reference control level and week dose control level,were used to calculate and compare the thickness of accelerator room shielding.Results Under the same condition of maximum weekly workload,the obtained results were different when the calculated dose rate reference control value was larger than dose rate reference control level (2.5 μSv/h).The maximum difference of shielding thickness reached 64 cm.Meanwhile,considering dose rate reference control level,the different accelerator rates could lead to different radiation shielding thickness.Conclusions The dose rate at reference point must be first calculated before calculating shielding thickness.The calculation should be made on the premise that dose rate reference control level is met.