In the recent charts of the nuclides an accepted half-life of ^(79)Se is only an upper limit,<6.5×10^(4)a.In this letter,A new half-life of ^(79)Se has been measured tobe(1.13±0.17)×10^(6)a.The number of ^(79)Se atoms was determined from measured ^(79)Se/Se ratios with the accelerator mass spectrometry technique and the decay rate of ^(79)Se was determined by counting the emitted β rays with a liquid scintillationspectrorneter.
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