摘要
为了控制粒子源植入组织间实施近距离放射治疗的质量,防范医疗照射事故的发生,按照国际原子能机构1274号技术报告要求,对同一批次(50枚)放射源的10%(5枚)进行检测,并要求测得的粒子源的表观活度与厂家给出值的相对偏差在5%以内。本文介绍了我院临床上使用的125I粒子源(6711型)的活度的测定方法。采用井型电离室测定125I粒子源的空气比释动能率,进而估算出125I粒子源的表观活度(又称等效活度),并对结果进行了分析。结果表明,该批125I粒子源的活度合格率达到80%。
For controlling the quality of the radiotherapy in which seed sources are implanted in the tissue to treat the cancer and avoiding the medical accident of exposure. 10% （5 seeds） of 50 seeds are checked and it is required that the relative deviation of apparent activity of seed sources between measured value and vendor＇s is within the range of 5%. The paper introduces the calibration method of ^125I sources used in clinic of our hospital. The Air Kenna Rate of ^125I sources is determined by the well-type ionization chamber. Thereafter the apparent activity of ^125I sources is calculated and measured results are anylyzed. The results show that 80% of ^125I sources are up to grade.
出处
《辐射防护》
CAS
CSCD
北大核心
2007年第3期181-183,共3页
Radiation Protection
