Evaluation of 234Th nuclear decay data.

(234)Th is a naturally occurring radionuclide being the daughter of (238)U. This paper presents the results obtained in a new evaluation of the nuclear data characterizing the (234)Th radioactive decay. The following decay characteristics have been evaluated: half-life, energies and probabilities of beta and gamma-ray transitions, internal conversion coefficients, energies and emission probabilities of gamma-rays, X-rays, conversion and Auger electrons. Some evaluation difficulties encountered have been pointed out. A new recommended absolute emission probability of 3.75 (8)% has been proposed for the main 63.3-keV gamma-ray in the (234)Th decay. Some practical considerations of the (234)Th activity determination by gamma-ray spectrometry are also presented.