Abstract: POLLUTION AND LEAKAGE EXAMINATION OF SEALEDRADIOACTIVE SOURCE FOR WELL LOGGINGXu Tonglin(Shengli Petroleum Administrative Bureau， Dongying 257096)Su Qong(Industrial Health Lab of Ministry of Health, Beijing 100088)Abstract The examination of surface pollution and leakage to part of sealed radioactive source commonly used in logging and experiment are carried out by Well Logging Company of Shengli Petroleum Administrative Bureau.The practice indicates that it is necessary for safe operation in well logging to examine regularly the seal performance of radioactive sources.Key words sealed radioactive source pollution examination\ leakage examination