核电站β表面污染监测仪校准源的选取  

Choice of Calibration Source for β Surface Contamination Monitor in Nuclear Power Plant

作　　者：韦应靖[1] 崔伟[1] 黄亚雯[1] 唐智辉 商洁[1] 谷伟刚 

机构地区：[1]中国辐射防护研究院,山西太原030006

出　　处：《原子能科学技术》2016年第9期1713-1716,共4页Atomic Energy Science and Technology

摘　　要：通过对3种堆型核电站大修期间现场系统设备辐射测量,确定了核电站主要存在的放射性核素种类及伴随β射线能量范围。实验测量了核电站目前使用的部分β表面污染监测仪对不同能量β射线的表面活度响应特性,发现核电站β表面污染监测仪测量结果使用^(90)Sr-^(90)Y放射源的表面活度响应或校准因子修正,会导致测量的表面污染水平偏低。根据核电站存在的β射线能量分布范围,建议核电站β表面污染监测仪测量结果采用^(204)Tl或^(36)Cl的表面活度响应值或校准因子修正。Through radiation measurement of in-site system equipment in three types of reactors during overhauling,the typical types of radio-nuclides and the energy range ofβray existed in nuclear power plants（NPPs）were obtained.The surface activity responses toβrays with different energy of some common-usedβsurface contamination monitors were experimentally investigated.It is found that using the surface activity response of ^（90）Sr-^（90）Y plane source to calibrate these monitors would underestimate the real level of surface contamination.With respect to the energy range ofβray in NPPs,it is suggested that ^（204）Tl or ^（36）Cl would be employed to calibrate the surface activity response ofβsurface contamination monitors.

关 键 词：β表面污染监测仪 表面活度响应 90Sr-90 Y 36Cl 204Tl 

分 类 号：O571.322[理学—粒子物理与原子核物理]