Half-life of Sm151 remeasured

The half-life of Sm151 was redetermined and compared with literature values. A ¹⁵¹Sm₂O₃ sample was produced by exposing ¹⁵⁰Sm₂O₃ to the high neutron flux of the heavy water research reactor at the China Institute of Atomic Energy (CIAE). The number of atoms and the activity of Sm151 in the sample were measured by thermal ionization mass spectrometry (TIMS) and liquid scintillation counting (LSC), respectively. The half-life of Sm151 determined in this work is 96.6 yr, with a standard uncertainty of 2.4 yr based on a quadratic summation of the uncertainty components from the measurements of the number of atoms and the activity of Sm151.