Determination of disintegration rates and gamma-ray emission probabilities of 65Zn and 241Am.
Radioactive solutions of (65)Zn and (241)Am were standardized within the frame of the CCRI (II)/BIPM key comparisons carried out recently in 2003. The activity concentrations (in Bqg(-1)) were determined using the 4pi(proportional counter)-gamma coincidence counting method with efficiency extrapolation. Liquid scintillation methods were also used for (241)Am activity determination. The 1115.5 keV of (65)Zn and the 26.35 and 59.54 keV of (241)Am gamma-ray emission probabilities were determined as 0.4971, 0.0206 and 0.3587, respectively, using a planar germanium detector. The associated relative uncertainties were 0.33%, 1.56% and 0.47%, respectively.
Iwahara
Akira
A
Laboratório Nacional de Metrologia das Radiações Ionizantes, Instituto de Radiprotecao e, Ionizantes Instituto Radioprotecao, Dosimetria (LNMRI/IRD/CNEN), Av. Salvador Allende, s/n, Recreio, CEP 22780-160, Rio de Janeiro, Brazil. iwahara@ird.gov.br
Aguiar Leobino da Silva
Mônica
M
Edsom Carvalho Filho
Antônio
A
Bernardes
Estela Maria de Oliveira
EM
Delgado
José Ubiratan
JU