γ射线移动探伤的防护距离估算  

Estimation of the Protection Distance in Mobile Gamma-ray Radiography

作　　者：韦正[1] 刁端阳[1] 张平[1] 

机构地区：[1]江苏省辐射环境监测管理站,江苏南京210019

出　　处：《中国辐射卫生》2010年第3期277-278,共2页Chinese Journal of Radiological Health

基　　金：环境保护部"工业γ射线探伤的辐射防护要求"项目资助

摘　　要：目的探讨γ射线移动探伤时无屏蔽射线的防护距离,有利于探伤人员划分控制区和监督区边界时参考。方法利用点源公式,考虑空气对不同能量γ射线的吸收影响,估算符合边界剂量率要求的控制区和监督区边界距离。结果给出了不同活度60Co、192Ir、75Se三种探伤常用放射源对应的控制区和监督区边界距离。结论考虑空气吸收时控制区距离缩短约10%~20%,监督区距离缩短20%以上,便于探伤人员更加快捷、准确的划定合适的控制区和监督区。Objective To discuss the protection distance of unshielded γ ray in industrial radiography in open areas,and help the radiation workers to divide the boundary of controlled area and supervised area.Methods The distance was estimated by using the point-source formula and considering the absorption of air on different energy γ-ray.It＇s in line with the dose-rate limit of the control area and supervised area boundary.Rusults The controlled area and supervised area distance of commonly used radioactive sources 60Co,192Ir and 75Se with different activity was given.Conclusion The distance of controlled area was reduced about 10% to 20% while considering the air absorption,the supervised area was reduced more than 20%.The radiation workers can use it to ensure the barriers fast and accurate.

关 键 词：Γ射线 移动探伤 防护距离 

分 类 号：TL77[核科学技术—辐射防护及环境保护]