铒掺杂钨酸铋对低能伽马射线屏蔽性能研究  

Study on the Shielding Property of Er3+Doped Bi2WO6 Against Low Energγ-rays

作　　者：王国伟 张海涛 毛楚元 吴正新[1] 刘永 颜强 刘国卿[1] WANG Guowei;ZHANG Haitao;MAO Chuyuan;WU Zhengxin;LIU Yong;YAN Qiang;LIUGuoqing(Institute for Advanced Study in Nuclear Energy&Safety,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学中国核能与安全高等研究院,深圳518060

出　　处：《核电子学与探测技术》2023年第4期778-783,共6页Nuclear Electronics & Detection Technology

基　　金：深圳市科技创新委技术攻关重点项目(JSGG20210713091539014);中核集团领创科研基金项目(20221024000072F6);上海航天科技创新基金(SAST2021-023)。

摘　　要：采用水热法合成了Er^(3+)掺杂钨酸铋(Bi_(2)WO_(6))纳米晶体,并通过X射线衍射仪(XRD)、扫描电镜(SEM)、X射线能谱仪(EDS)等手段进行了表征,利用高纯锗伽马能谱仪,研究了其对低能伽马射线的屏蔽性能。结果表明,Er^(3+)被成功掺杂到Bi_(2)WO_(6)中,且Er^(3+)掺杂并未改变钨酸铋的晶体结构;另外,随着Er^(3+)掺杂比例的增加,钨酸铋的形貌从片层堆积结构变为更为紧密聚集的花球状。研究发现,掺杂Er^(3+)后Bi_(2)WO_(6)对低能伽马射线(59.5 keV)的屏蔽性能显著增加,当掺杂的摩尔分数为12.5%时,其质量减弱系数达到了12.6 cm2/g,较未掺杂的Bi_(2)WO_(6)的屏蔽性能提高了25%。研究结果可为无毒、环保、高效的伽马射线屏蔽材料的开发提供有益参考。Er^(3+)doped bismuth tungstate(Bi_(2)WO_(6))nanocrystals were synthesized by hydrothermal method and characterized by X-ray diffract ometer(XRD),scanning electron microscopy(SEM)and X-ray energy dispersive spectroscopy(EDS).The shielding performance of the nanocrystals for low-energy gamma rays was tested via HPGe detector.The results showed that Er^(3+)was successfuly doped into Bi,WO,and Er^(3+)doping did not change the crystal structure of Bi,WO.In addition,with the increasing of Er^(3+)doping ratio,the morphology of bismuth tungstate changed from a lamellar stacking structure to a more closely clustered flower ball shape.It is indicated that the shielding performance of Bi_(2)WO_(6)against low-energy gamma rays(59.5 keV)is significantly improved after doping Er^(3+),the mass reduction coefficient was 12.6 cm²/g with 12.5%of mole fraction Er^(3+)doping,which is 25%higher than that of pure Bi_(2)WO_(6)The results of this study can provide a useful reference for the development of non-toxic,environmentally friendly and efficient gamma ray shielding materials.

关 键 词：钨酸铋 铒掺杂 伽马射线 屏蔽性能 无铅材料 

分 类 号：TL84[核科学技术—核技术及应用]