title: Primary activity standardization of (57)Co by sum-peak method.
abstract: The sum-peak method was applied to standardize a (57)Co solution within the framework of an international comparison organized by International Atomic Energy Agency, in 2008, aimed toward international traceability of activity measurements. A planar germanium detector was used with the sources placed on top of the detector for activity determination measurements. An analytical expression for accidental summing correction was derived and the effect of the germanium characteristic KX-ray escape peak of 112keV was taken into account. The standard uncertainty associated to the activity concentration value was 0.37% and the result was compared with other measurement methods.
authors.affiliation: Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI)/Instituto de Radioproteção e Dosimetria (IRD)/Comissão Nacional de Energia Nuclear (CNEN), Rio de Janeiro, Brazil. iwahara@ird.gov.br
authors.forename: A
authors.initials: A
authors.lastname: Iwahara
authors.forename: R
authors.initials: R
authors.lastname: Poledna
authors.forename: C J
authors.initials: CJ
authors.lastname: da Silva
authors.forename: L
authors.initials: L
authors.lastname: Tauhata