有用线束朝向迷路内墙的加速器机房辐射屏蔽计算

Radiation shielding for medical linear accelerator room with useful beam towards its maze

目的 探讨有用线束朝向迷路内墙的放射治疗机房的辐射屏蔽计算方法.方法 根据国家职业卫生标准GBZ/T 201.2对某改建机房进行屏蔽计算,并与实际检测结果进行比较.结果 迷路入口处瞬时剂量率的理论计算结果和实际检测结果,防护门内分别为89和86 μSv/h,防护门外分别为5.7和6.2 μSv/h,理论计算结果与实际检测结果具有较好的一致性.结论 通过理论计算结果与检测结果的比较,验证了理论计算方法的准确性.

Objective To study the calculational method for the radiotherapy facilities of the medical linear accelerator＇ s useful beam towars its maze.Methods The shielding calculation was made under the relevant national standards for a radiotherapy treatment room and compared with the test results.Results The dose rates at the maze entrance as calculated and measured were 89 and 86 μSv/h inside the maze door,as well as 5.7 and 6.2 μSv/h outside the maze door,respectively.The calculated results were consistent with measured results.Conclusions By comparison of calculated results with measured results,the accuracy of the theoretical calculation method could be verified.