基于Fe(OH)3-CaCO3载带的水中^228Ra的γ能谱分析方法  

γSpectrometry Analysis Method for ^228Ra in Water Based on Fe(OH)3-CaCO3 Carrier

作　　者：夏明明 梁永广 於国兵 陈志 XIA Mingming;LIANG Yongguang;YU Guobing;CHEN Zhi(School of Physics Sciences,University of Science and Technology of China,Hefei 230027,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China;Anhui Radiation Environment Supervision Station,Hefei 230071,China)

机构地区：[1]中国科学技术大学物理学院,安徽合肥230027 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213 [3]安徽省辐射环境监督站,安徽合肥230071

出　　处：《原子能科学技术》2020年第9期1699-1703,共5页Atomic Energy Science and Technology

摘　　要：建立了一种基于Fe(OH)3-CaCO3载带的水中^228Ra的γ能谱分析方法,适用于环境水中^228Ra的分析。采用Fe(OH)3-CaCO3共沉淀法富集水中的^228Ra,将富集后的^228Ra采用Ba(Ra)SO4共沉淀法进一步载带,133Ba示踪法确定^228Ra的全程回收率,使用高纯锗γ谱仪测量与^228Ra达到放射性平衡的衰变子体^228Ac的特征γ能量,从而获得^228Ra的分析结果。通过对5 L水样的加标验证可知,^228Ra回收率为81.8%~87.5%,加标水样测量结果与添加量的相对偏差为1.7%~5.3%,此方法的探测限为57.2 mBq/L。Theγspectrometry analysis method for ^228Ra in water based on Fe(OH)3-CaCO3 carrier was developed,which is suitable for the analysis of ^228Ra in environmental water.The enrichment method of ^228Ra in water was carried out by Fe(OH)3-CaCO3 co-precipitation method.The enriched ^228Ra was further loaded by Ba(Ra)SO4 co-precipitation method,and ^228Ra was determined by 133Ba tracer method.The full recovery rate was measured using high-purity Geγspectrometer to measure the characteristicγenergy of the decaying daughter ^228Ac,which reached the radioactive equilibrium with ^228Ra,thereby obtaining the analysis result of ^228Ra.Through the calibration of 5 L water sample,it is known that the recovery rate of ^228Ra is in the range of 81.8%-87.5%.The relative deviation of the water sample measurement is 1.7%-5.3%,and the detection limit of this method is 57.2 mBq/L.

关 键 词：^228Ra γ能谱分析 方法回收率 探测限 

分 类 号：TL99[核科学技术—核技术及应用] O657.4[理学—分析化学]