高剂量率铱-192微型源在水模中的剂量分布计算  

Calculation on the Dose Distribution in Water Phantom of High-dose-rate Iridium-192

作　　者：程品晶[1] 宦琰[1] 凌球[1] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001

出　　处：《核电子学与探测技术》2007年第6期1132-1134,共3页Nuclear Electronics & Detection Technology

摘　　要：根据核通公司提供的高剂量率(HDR)微型铱源(Ir-192)的结构,计算其在水模体中的剂量分布情况,为后装治疗中的物理剂量优化提供数据。方法是采用蒙特卡罗程序(EGSnrc)计算源中垂轴上(径向)的剂量分布和中心轴方向紧靠不锈钢外壳处的剂量分布。计算结果表明源中垂轴上剂量随离轴距离的增加递减,中垂轴外的剂量分布呈各项异性,不锈钢外壳对剂量计算的影响可以忽略。To provide the dose data needed for optimizing treatment in afterloading therapy, the dose distribution was calculated in water phantom for high-dose-rate iridiurn-192 with Monte Carlo approach based the Ir source structure of Nucletron Corporation. The code EGSnrc was used when the dose was calculated at the outside of stainless steel shell along the perpendicular and the central axis. The results show that the dose along the perpendicular becomes lower with the rising of distance to the steel shell, the dose beyond the perpendicular appears anisotropy and the impact of steel shell on the calculation of dose can be ignored.

关 键 词：铱源 蒙特卡罗方法 水模 剂量分布 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]