Half-Life Measurement of ¹⁷⁵Hf

The existing data of ¹⁷⁵Hf half-life are few and have large differences, which is unfavorable to use nuclear parameters accurately. In this experiment, ¹⁷⁵Lu was bombarded by accelerator proton beam and purified by HDEHP extraction leaching resin. Then high purity ¹⁷⁵Hf was obtained，which is free carrier and no interference of ¹⁸¹Hf. Decontamination factors for ⁶⁵Zn and ⁵⁶Co respectively are 5.2×10³ and 2.3×10³. ¹³⁷Cs, as a supervision source, was measured lasting 40 days with ¹⁷⁵Hf. The half-life value of ¹⁷⁵Hf is (70.73±0.25) d obtained by fitting the relation between the ratio of 343 keV and 661 keV γ-ray counting rate and time.