Standardization of (241)Am, (124)Sb and (131)I by live-timed anti-coincidence counting with extending dead time.
The National Metrology Laboratory for Ionizing Radiation (LNMRI)/Brazil has implemented a live-timed anti-coincidence system with extending dead time to complement the existing systems in its Radionuclide Laboratory for activity measurements of radioactive sources. In this new system, the proportional counter has been replaced by a liquid-scintillation-counter for alpha and beta detection. In order to test the performance of the new system, radioactive solutions of (131)I, (124)Sb and (241)Am have been standardized. In this work the measurement method, the results and the associated uncertainties are described and discussed.
da Silva
Carlos J
CJ
Laboratório Nacional de Metrologia das Radiações Ionizantes, Comissão Nacional de Energia Nuclear , Av. Salvador Allende, s/n-Recreio, CEP 22780-160 Rio de Janeiro, Brazil. Carlos@ird.gov.br
Iwahara
A
A
Poledna
R
R
de Oliveira
E M
EM
de Prinzio
M A R R
MA
Delgado
José U
JU
Lopes
Ricardo T
RT