本文报道一起~(192Ir)γ射线探伤时放射源脱落事故的调查分析。对事故受照者作了医学检查并估算了受照剂量,分析讨论了事故发生原因,提出了修改事故分级标准的建议。 This paper reports a ~ (192Ir) gamma ray flaw detection accident investigation and analysis of radioactive sources. Medical accident victims were inspected and the doses were estimated. The causes of the accidents were analyzed and discussed, and some suggestions for revising the grading standards were put forward.