Half-life measurement of ⁸⁹Rb

⁸⁹Rb 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 ⁸⁹Rb 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 ⁸⁹Rb, 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 ⁸⁹Rb is (14.41±0.04) min. (authors)