title: Standardization of a 204Tl radioactive solution.
abstract: The standardization of 204Tl is described. The efficiency tracing technique was applied using 134Cs as tracer. The 4(pi)beta-gamma coincidence system was used for the calibration. The (Laboratorio de Metrologia Nuclear) has participated in this comparison in collaboration with the Laboratório Nacional de Metrologia das Radiações Ionizantes, from Rio de Janeiro. Independent results using different techniques were developed by each of these laboratories and included in the comparison.
authors.affiliation: Laboratorio de Metrologia Nuclear, Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), Centro do Reator de Pesquisas-CRPq, CP 11049, Pinheiros, São Paulo, Brazil. msdias@net.ipen.br
authors.forename: Mauro S
authors.initials: MS
authors.lastname: Dias
authors.forename: Marina F
authors.initials: MF
authors.lastname: Koskinas