论文部分内容阅读
目的对某医院电子加速器建设项目屏蔽防护进行职业病危害分析和评价。方法选取广东省某三甲医院电子加速器建设项目作为评价对象,采用451P电离室巡测仪和6150AD6/H+6150AD-n中子巡视仪对直线加速器工作场所进行防护检测。通过理论计算和现场检测两种方法,将所得数据与标准要求进行比较。结果该项目加速器机房外30 cm处周围剂量当量率在0.15~0.95μSv/h,低于限值要求。结合工作人员和公众在机房外各区域居留因子估算得出:工作人员周剂量最大值为1.75μSv;公众周剂量最大值为2.31μSv,均低于标准限值要求。结论该电子加速器建设项目屏蔽防护能满足国家标准要求,在正常情况下发生放射损伤的可能性较小。结合理论计算法和现场检测法共同验证了该医院电子加速器机房屏蔽防护是可行的。同时,也验证了利用理论计算法给出的屏蔽设计方案能从源头上控制射线泄漏。
Objective To analyze and evaluate the occupational hazards of shielding shielding in the construction project of a hospital electronic accelerator. Methods The construction project of electronic accelerator in a top three hospital in Guangdong Province was selected as the evaluation object. The 451P ionization chamber tourimeter and the 6150AD6 / H + 6150AD-n neutron analyzer were used to test the linear accelerator workplace. Through theoretical calculation and on-site detection of two methods, the data obtained are compared with the standard requirements. Results The dose equivalent ratio around the accelerator room at 30 cm was 0.15 ~ 0.95μSv / h, which was lower than the limit value. The combination of staff and the public in the area outside the engine room to estimate the residence factor: the weekly staff maximum dose of 1.75μSv; public weekly maximum dose of 2.31μSv, are lower than the standard limit requirements. Conclusion The shield construction of this accelerator can meet the requirements of national standards and is less likely to cause radiation damage under normal conditions. Combined with theoretical calculation and field detection methods to jointly verify the hospital electronic accelerator screen shielding is feasible. At the same time, it is also verified that the shielding design scheme given by the theoretical calculation method can control the radiation leakage from the source.