惰性气体流出物离线监测仪的三种效率校准方法研究  

Investigation of Three Efficiency Calibration Methods for Off-line Noble Gas Effluent Monitor

作　　者：陈立[1,2] 唐智辉 李强[2] 王斌 韦应靖[2] 张庆利[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]中国辐射防护研究院,山西太原030006 [3]中核核电运行管理有限公司,浙江海盐314300

出　　处：《原子能科学技术》2016年第9期1706-1712,共7页Atomic Energy Science and Technology

摘　　要：介绍了3种替代的效率校准方法,并分别用它们计算1台HPGe谱仪测量1枚等效气体源时的探测效率曲线。蒙特卡罗（MC）法建立的探测器模型中所用尺寸参数为厂商提供的值,其计算结果不可靠,与实验值的最大相对偏差达130%。数值积分法和代表点法皆用了1枚多γ核素标准点源,同时还借助了MC模拟计算。当γ射线能量在60～1 836keV范围时,代表点法计算结果的相对偏差≤±6%,数值积分法计算结果的相对偏差≤±4%,这两种方法均能满足现场工作对不确定度的要求,其中代表点法更易实施。Three alternative efficiency calibration methods were introduced and employed to calculate the efficiency curve for detecting a simulated gas source with known activity by a HPGe detector.The dimension parameters of the model utilized by Monte Carlo（MC）method were based on the parameter values supplied by its manufactory.The result of MC method is unreliable and its maximal relative deviation reaches 130%compared with the experimental results.Both numerical integration（NI）method and representative point（RP）method utilized a multi-γpoint-like standard source as well as MC simulation.When the energy range ofγ-ray is 60-1 836 keV,the relative deviations of RP method are within±6% while those of NI method are within±4%.The NI and RP methods satisfy the uncertainty requirement in field work,while RP method is mucheasier to be implemented.

关 键 词：惰性气体流出物监测 探测效率校准 蒙特卡罗 

分 类 号：TL84[核科学技术—核技术及应用]