Isomeric Transition of Hf¹⁷⁹

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Decay of Hf^179m was investigated by a well type scintillation counter. Half-lives of peaks which were seen in sum spectra were determined as 19±2 sec. The K internal conversion coefficient of the 161 keV transition was also determined as 17±2. E4 mixing ratio to the M3 component was, therefore, 0.14±0.14.