电沉积法制备^226Raα样品源的优化研究  

Optimization for Preparation of Plating ^226Ra for α Spectrometry

作　　者：徐平[1] 於国兵 梁永广 顾先宝 闻德运 龚籽月 陈志[1] XU Ping;YU Guobing;LIANG Yongguang;GU Xianbao;WEN Deyun;GONG Ziyue;CHEN Zhi(University of Science and Technology of China,Hefei 230027,China;Anhui Radiation Environmental Supervision Station,Hefei 230071,China)

机构地区：[1]中国科学技术大学,安徽合肥230027 [2]安徽省辐射环境监督站,安徽合肥230071

出　　处：《原子能科学技术》2021年第2期343-347,共5页Atomic Energy Science and Technology

摘　　要：α能谱法是一种直接测量α衰变的方法,具有探测限低、分析时间相对较短等优点。电沉积法制备的α样品源均匀且厚度可忽略,是目前最理想的制备^226Ra的α样品源的方法。为制得较高电沉积率的^226Ra的α样品源,本文对草酸氨/盐酸电沉积液中氯铂酸用量、电流密度、电沉积时间、草酸氨溶液的初始pH值和浓度等条件对^226Ra电沉积率的影响进行了优化研究。结果表明,在氯铂酸用量为700μg、电流密度为0.225 A/cm^2、电沉积时间为60 min、草酸氨溶液浓度为0.05~0.13 mol/L、草酸氨溶液的初始pH值为1.0~2.5等电沉积条件下,^226Ra电沉积样品源的电沉积率大于95%。α spectrometry is a direct method to measureα-emitting radionuclides,which has the advantages of low detection limit and short time-consuming.The electrodeposition method is the most ideal technique for preparation of source forαspectrometry,by which the source is homogeneous and self-absorbance negligible.To obtain high quality of electrodeposition sample of^226Ra,the effects of the quality of chloroplatinic acid,current density,electrodeposition time,initial pH and concentration of ammonia oxalate on electrodeposition yield of^226Ra were investigated on the base of the ammonia oxalate/hydrochloric acid electrolytes.The results show that under the conditions of chloroplatinic acid doseage of 700μg,the current density of 0.225 A/cm 2,the electrodeposition time of 60 min,the concentration of ammonia oxalate of 0.05-0.13 mol/L,the initial pH of ammonia oxalate of 1.0-2.5,the electrodeposition yield of^226Ra is over 95%.

关 键 词：电沉积法 226 Ra α样品源 氯铂酸 

分 类 号：O657.13[理学—分析化学] TL84[理学—化学]