title: Standardization of 134Cs by three methods.
abstract: The nuclide 34Cs decays by beta-emission followed by gamma-deexcitation to 134Ba with a half-life T(1/2) = 2.065 a. It has been standardized by three methods: liquid scintillation counting (LSC), 4pi beta-gamma coincidence counting and 4pi gamma counting. In the LSC measurements, the CIEMAT/NIST method was used to calculate the efficiency. For the coincidence measurements, a conventional 4pi beta (proportional counter)-gamma(NaI) system was used. For the 4pi gamma standardization, a well-type Nal(Tl) detector was modeled with the Monte Carlo package PENELOPE, and the counting efficiency obtained by calculation. Results of the three methods agree within 0.65%.
authors.affiliation: Metrología de Radiaciones Ionizantes, CIEMAT, Departamento de Fusión y Partículas Elementales, Madrid, Spain. e.garciatorano@ciemat.es
authors.forename: E
authors.initials: E
authors.lastname: García-Toraño
authors.forename: Barquero L
authors.initials: BL
authors.lastname: Rodríguez
authors.forename: M
authors.initials: M
authors.lastname: Roteta