DDEP re-evaluation of the radioactive decay scheme of 137Cs

Sylvain Leblond

doi:10.1016/j.apradiso.2024.111191

DDEP re-evaluation of the radioactive decay scheme of ¹³⁷Cs

Appl Radiat Isot. 2024 Apr:206:111191. doi: 10.1016/j.apradiso.2024.111191. Epub 2024 Jan 17.

Author

Sylvain Leblond¹

Affiliation

¹ Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120 Palaiseau, France. Electronic address: sylvain.leblond@cea.fr.

PMID: 38290201
DOI: 10.1016/j.apradiso.2024.111191

Abstract

A complete re-evaluation of the ¹³⁷Cs β^‒ decay scheme has been performed within the scope of the Decay Data Evaluation Project (DDEP), taking full advantage of the most recent measurements. An evaluated half-life of 30.018 (22) years is recommended, along with a full revision of the β^‒ decay branching ratios that also results in a re-evaluation of the absolute emission probability of the 662-keV gamma ray to give a value of 85.01 (20)%. Recommendations for new measurements are also suggested.

Keywords: (137)Cs; DDEP; Evaluated decay data; Half-life; β(‒) decay; γ decay.