^(142)La活度及主要γ射线发射几率实验测量  

Radioactivity and Mainγ-ray Emission Probability Measurements of Short Half-Life Nuclide ^(142)La

作　　者：汪建清[1] 姚顺和[1] 杨丽艳[2] 袁大庆[1] 郑艳明[1] 郭晓清[1] 

机构地区：[1]中国原子能科学研究院放射性计量测试部,北京102413 [2]四川大学物理科学与技术学院,四川成都610064

出　　处：《原子能科学技术》2010年第9期1025-1030,共6页Atomic Energy Science and Technology

摘　　要：利用数字符合方法对短寿命核素142La的活度和641 keV的γ射线绝对发射几率进行了实验测量。142La活度测量结果的合成标准不确定度小于0.46%,641.285 keV的γ射线发射几率测量结果为0.473±0.005(k=1),与《同位素表》第8版推荐数据0.474±0.005的相对偏差为-0.24%。此外,还依据γ射线发射几率测量工作中获取的数据,得到了142La的半衰期为(91.0±0.7)min,与《同位素表》第8版推荐数据(91.1±0.5)min的相对偏差小于0.2%。The radioactivity and the absolute gamma emission probability for the 641 keV main gamma ray of the short half nuclide ^142La were measured by DCC on a 4πβ-4πγ and a 4πβ-4πγ coincidence counting devices,and the standard uncertainty for the radioactivity measurement result is 0.46%,the emission probability of the 641 keV gamma ray is 0.473±0.005,which is only 0.24%lower than the data 0.474±0.005 proposed by the Table of Isotopes,8th edition.The relative emission probabilities of the other main gamma rays were measured by another HPGe gamma spectrometer, which relative efficiency is above 60%,the measurement results are good.The half life of ^142La was calculated to be（91.0±0.7）min,which has a lower deviation of 0.2% than（91.1±0.5）min proposed by the Table of Isotopes,8th edition.

关 键 词：放射性活度 短寿命核素 γ射线发射几率 

分 类 号：TL84[核科学技术—核技术及应用]