89Rb半衰期测量

摘要

89 Rb is an important fission product used for monitoring possible release of fission products from fuel element .The half-life is one of important nuclear parameters . The half-life of 89 Rb was determined using reference source method with two sets of HPGe detectors by place-relay way .In reference source method ,the ratio of net full-energy peak areas from the measure nuclide and the reference source was used to avoid the count correction caused by dead time and pileup .For the very short half-life of 89 Rb , the half-life iterative method was used in data analysis and the translation method was used in data unification .Finally ,the measured half-life of 89 Rb is (14.41 ± 0.04) min .%89 Rb是重要的裂变产物核素，半衰期是其一项非常重要的核参数。本文采用参考源法，运用双HPGe探头距离接续测定了89 Rb的半衰期。参考源法利用待测源和参考源的γ射线全能峰之比消除了测量过程中死时间和脉冲堆积带来的计数修正影响。由于89 Rb半衰期较短，数据分析运用了半衰期迭代法，并用平移法归一探头测量数据，最终实验测得89 Rb半衰期为（14.41±0.04） min。