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.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2010年第9期1025-1030,共6页
Atomic Energy Science and Technology
关键词
放射性活度
短寿命核素
γ射线发射几率
radioactivity
short half-life nuclide
γ-ray emission probability
