无源效率刻度方法在中子剂量估算中的应用  

Application of laboratory sourceless object counting for the estimation of the neutron dose

作　　者：成杰[1] 南宏杰 宁静[1] 张晓敏[1] 曲德成[1] 谢向东[1] 

机构地区：[1]军事医学科学院放射与辐射医学研究所,北京100850 [2]防化学院二系,北京102205

出　　处：《军事医学》2011年第10期773-775,共3页Military Medical Sciences

摘　　要：目的在意外中子照射情况下,快速给出探测器的探测效率,利用24Na能谱分析法估算中子剂量。方法使用Genius-2000 GeomComposer软件实现对探测器的效率刻度。结果可快速给出探测器对3 ml血样中1.368 MeV能量的γ光子的探测效率,其数值为4.05271×10-2,软件给出的误差为4.0%。对中子照射样品的剂量估算值为1.94～2.82 Gy,算术平均值为2.38 Gy,剂量值的不确定度约为20.07%。结论将无源效率刻度方法应用在人体血液24Na能谱分析法中,可提高估算速度。ObjectiveTo estimate the neutron dose using 24Na energy spectrum analysis method.MethodsGenius-2000 GeomComposer software package was used to calibrate the efficiency of the detector.Results The detection efficiency of the detector toward γ photon with an energy of 1.368 MeV was quickly found to be 4.05271×10-2 while the error of the software was 4.0%.The estimated dose value of the neutron irradiation samples was between 1.94 Gy and 2.82 Gy,with an arithmetic mean value of 2.38 Gy.The uncertainty of the dosimetry was about 20.07%.ConclusionThe application of efficiency calibration without a radioactive source to the energy spectrum analysis of the 24Na contained in human blood will accelerate the estimation process.

关 键 词：辐射损伤 无源效率刻度 中子剂量 估算 应用 

分 类 号：R144[医药卫生—公共卫生与预防医学]