1997年9月29日我站接到某锅炉厂报告：该厂一钴-60探伤机作业时发生卡源，无法回收，放射源连同探伤机等部件现均封闭在探伤机房内。接报后我们当即到达现场进行处理。据了解，该探伤机于1992年3月购入，当时放射源活度为1．41TBq，现有活度约0．67TBq，1997年9月28日操作人员 On September 29, 1997, I received a report from a boiler factory that the source of a cobalt -60 flaw detector could not be recovered during the operation of the plant. The radioactive sources, together with the flaw detector and other components, are now sealed in the flaw detection engine room. After receiving the report, we immediately arrived at the scene for handling. It is understood that the flaw detection machine was purchased in March 1992, when radioactive source activity was 1.41TBq, the existing activity of about 0.67TBq, September 28, 1997 operating personnel