不同体模校准眼晶状体H_p(3)剂量计的研究  

Study of Calibration the Dosemeter for Measuring Eye Lens Dose in Terms of H_P(3) with Different Phantoms

作　　者：李海亮[1,2] 王仲文[1] 朱建国[2] 许家昂[2] 杨迎晓[2] 张琳[2] 李福生[2] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]山东省医学科学院放射医学研究所

出　　处：《中国辐射卫生》2016年第2期129-133,共5页Chinese Journal of Radiological Health

基　　金：山东省自然科学基金资助项目(ZR2013AM018);山东省医药卫生科技发展项目(2015WS0200)

摘　　要：目的对眼晶体Hp（3）剂量计进行校准，研究剂量计的批均匀性、探测阈、线性、能量响应和各向同性等性能指标。方法根据ISO12794（2000）标准的要求，采用板状水体模与正圆柱注水体模两种体模相比较的方法，选择ISO4037中的窄束x射线辐射质（N60～N120）进行实验。结果剂量计的批均匀性，变异系数为5．7％；探测阈，小于0．1mSv；线性，对两种体模，剂量的响应均小于10％；能量响应，对两种体模均为-20％〈R〈40％；各向同性，响应平均值与垂直入射响应的差别，板状水体模为（1．05±0．03），正圆柱注水体模为（0．99±0．08）。结论在所选择的实验条件下，两种体模都适合于眼晶体剂量计的校准。剂量计的校准结果符合ISO 12794的要求，适合用于介入放射学工作场所中的测量。Objective To calibrate the dosemeter for measuring eye lens dose in terms of Hp （3） and study the performance of the dosemeter, such as batch homogeneity, detection threshold,linearity, energy response,isotropy. Methoods The standard for calibration is based on ISO 12794 （2000） , phantoms are slab phantom and cylindrical phantom ,radiation quality is the narrow beam X - ray（ N60 - N120） taken from ISO 4037. Results The performance of the dosemeter,as batch homogeneity, the coefficient of variation is 5.7%. The detection threshold is less than 0.1 mSv. As linearity, for two phantoms, response are both less than 10%. The energy responses to both phantoms, are in the range of 20% -40%. As isotropy,mean value of the response differ from the response of normal incidence is （ 1.05 ± 0.03 ） for the slab phantom, and （0.99 ± 0.08 ）for the cylin- drical phantom. Conclusion For selected experimental conditions, both phantoms are suitable for eye lens dosemeter calibration, the calibration results conform to the requirements of ISO 12794, the dosemeter is suitable for using in interventional radiology.

关 键 词：眼晶状体 剂量 热释光剂量计 转换系数 校准 

分 类 号：TL816.7[核科学技术—核技术及应用]