title: Disintegration rate measurement of a 152Eu solution.
abstract: The procedure followed by the Laboratório de Metrologia Nuclear at the IPEN-CNEN/SP, in São Paulo, for the standardization of 152Eu is described. The disintegration rate of 152Eu has been measured using the 4pi beta-gamma coincidence technique, using a 4pi proportional counter, filled with P-10 gas and operated at 0.1 MPa, coupled to one HPGe detector for the gamma-ray emission. Two discrimination windows were set in the gamma-channel, one related to the beta branch (344 keV) and the other related to the electron capture events (1408.03 keV), in order to determine the counting efficiencies for beta, X-ray and Auger electron events in the proportional counter. The activity of solution was determined by a biparametric extrapolation curve obtained for the two selected gamma-windows.
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), Laboratório de Metrologia Nuclear-Centro do Reator de Pesquisas-CRPq, São Paulo, SP, Brazil.
authors.forename: Marina F
authors.initials: MF
authors.lastname: Koskinas
authors.forename: Kátia A
authors.initials: KA
authors.lastname: Fonseca
authors.forename: Mauro S
authors.initials: MS
authors.lastname: Dias