随着放射性同位索与射线装置的广泛应用，放射事故亦时有发生。本文通过对一例放射事故原因的分析，发现其原因除设备故障或制度不完善外，放射工作人员的心理紧张因素也不能忽视。1误入事故的经过1985年6月22日下午，我省某单位职工×××在辐照室内（钻源活度为0．17PBq，于 With the widespread use of radioisotopes and ray devices, radiological accidents have occurred from time to time. In this paper, through an analysis of the causes of a radiological accident, it is found that the causes of the accidents can not be neglected except the equipment failure or the imperfect system. 1 strayed into the accident after June 22, 1985 afternoon, a unit of workers in our province × × × in the irradiation room (drilling activity of 0.17PBq, at