强源倒装中的安全防护与辐射监测

SAFETY PROTECTION AND RADIATION MONITORING IN STRONG SOURCE RELOCATION OPERATION

本文介绍上海辐射技术推广应用中心1986—1988年进行的三次强源(3.7—7.9×10^(15)Bq)倒装的操作程序、安全措施和倒源过程中的辐射监测。监测结果表明:运输铅容器表面的照射量率最大为17mR·h^(-1);工作人员在一次倒源操作中接受的剂量当量最大为9.1×10^(-2)mSv;钴元件污染或泄漏的放射性活度的检测值最大为42Bq/支,低于 ISO 规定的限值(185Bq/支);装源后辐照室周围环境的照射量率最大为17μ·h^(-1)。

This article descricas the whole process,safety measures and radiation monitoring in threestrong source(3.7—7.9×10^(15)Bq)operations in 1986.The monitoring result are as follows:themaximum exposurerate on the surface of transportation plumbic-container is 17 mR/h.The highestdose equivalent that received by the operators at one operation is about 0.91 μSv.The monitoring valueof pollution or leakege radioactivity from the cobalt element is 42 Bq/element which is lower than theISO limit(185 Bq/element).After the source has been placed in the irradiation room,the exposurerate around the room is 17 μR/h.