Measurement of the 117mSn, 125mTe, 135mBa and 195mPt half-lives for reactor dosimetry application.

Nuclear isomers are investigated to perform precise epithermal neutron dosimetry. One key physical property for reactor dosimetry is the precise knowledge of the isomer half-life. In the list of potential candidates, the half-life values available in the literature or in the recommended database for reactor dosimetry for 117mSn, 125mTe, 135mBa and 195mPt show some discrepancy. New half-life measurements are presented in this work. Those isomers were produced by neutron activation at the JSI TRIGA Reactor from tin, tellurium, barium (all three of them enriched in their parent of interest) and natural platinum dosimeters. Precise half-lives measurements were performed at the MADERE platform using gamma and X-ray spectrometry. Special care has been taken on the uncertainty determinations. • New elements for fast neutron dosimetry are currently under investigation. • Metastable states of Tellurium, Tin, Barium, and Platinum are promising candidates. • Half-lives are key elements in reactor dosimetry. • For nuclear data assessment, uncertainties must be determined with high accuracy. • Good agreement of the measurement with the litterature. [ABSTRACT FROM AUTHOR]