铱-192工业探伤源对典型居民区的剂量计算

摘要

根据中国原子能科学研究院铱- 192工业探伤源物理参数,采用蒙特卡罗方法程序(MCNP)计算了铱-192源在典型居民区的空间剂量分布和居民的吸收剂量率.结果表明:水平方向1200 cm处在“有”和“无”混凝土墙防护情况下的吸收剂量率分别为12.2000和2090.0000μGy/h,垂直方向吸收剂量率随位置呈指数衰减；铱-192源所存放2#居民楼3楼层以上住户的吸收剂量率低于USNRC限值.计算结果将为铱- 192放射源事故的评估和受照人群的医学治疗提供参考.%Space dose distribution and inhabitant absorbed dose rate in typical residential area induced by indium - 192, which based on physics parameter of China Institute of Atomic Energy industrial radiography indium -192 source is calculated by Monte Carlo methods code MCNP. Results show that horizontal absorbed dose rate with concrete wall is 12.200 0 μGy/h and without it is 2 090.000 0 μGy/h, vertical absorbed dose rate attenuates with exponential law, that absorbed dose rate of inhabitant who bide over 3 floor in 2# dwelling house is under the limit value of USNRC. The calculated results will provide a reference for evaluation of indium -192 source accident and therapeutic treatment of irradiated crowd.