^(125)I粒子源径向剂量的模拟测量研究  

Study of Analog Measurement Dose Distribution of ^(125)I Seed Source

作　　者：马蕊[1] 苑淑渝[1] 孔令海[1] 张良安[1] 

机构地区：[1]中国医学科学院北京协和医学院放射医学研究所天津市分子核医学重点实验室,天津300192

出　　处：《中国辐射卫生》2011年第1期26-27,共2页Chinese Journal of Radiological Health

摘　　要：目的研究放射性125I粒子源在肌肉组织等效材料模体中的剂量分布。方法研制肌肉组织等效模体,应用热释光剂量学方法和美国医学物理学家协会43报告工作组(AAPM TG-43)推荐的理论计算公式(理论计算法)对125I粒子源进行二维径向的剂量分布研究。结果在0.5cm处,TLD在0°、45°、90°、135°、180°、225°、270°、315°时测得的剂量率分布为9.61、5.72、9.33、5.05、10.65、5.15、10.7、5.74cGyh-1,理论计算值为3.94 cGyh-1。结论 125I粒子源的径向剂量率随距离增加快速下降。Objective To study the dose distribution of 125I seed source in the muscle tissue equivalent materials model. Methods Developing muscular tissue equivalent model, and studying radiation dose distribution of 125I seed source in two - dimensional radial with the method of thermoluminescence dosimetry and the theoretical formula （ calculation method） recommended by American Association of Physicists in Medicine Report of Working Group 43 （ AAPM TG - 43 ） . Results At 0.5cm point, When the angle is 0°,45° ,90°,135° ,180° ,225° ,270° ,315° ,TLD measured dose rate is 9.61,5.72,9.33, 5.05,10.65,5.15,10.7,5.74 cGyh -1, Theoretical calculation is 3.94 cGyh -1. There is a good agreement between The TLD measured and theoretically calculated result. Conclusions The radial dose of lzsI seed is attenuated very rapidly with radial distance.

关 键 词：近距离放射治疗 热释光剂量学 前列腺肿瘤 模体 

分 类 号：R144[医药卫生—公共卫生与预防医学]