Thermal neutron activation cross section for 48CaGuilherme S. Zahn1, Cibele B. Zamboni1, Laura C. Oliveira1 and Frederico A. Genezini2
1 Instituto de Pesquisas Energéticas e Nucleares, C.P. 11049, 05422-970 São Paulo SP, Brazil
2 Centro Regional de Ciências Nucleares - CRCN-CNEN/PE, Brazil
Published online: 21 May 2008
In this work several certified standard samples with very well-determined Calcium amounts were irradiated in the IEA-R1 nuclear reactor, under a thermal neutron flux of ~1012 n.cm-2.s-1. The samples were then analyzed in a high-resolution gamma spectrometer in order to determine the amount of 49Ca produced in the sample which, in turn, is directly proportional to the thermal neutron absorption cross section for 48Ca. These results allowed the determination of this cross section with an uncertainty that's 6 × lower than the compiled value and approximately half the uncertainty of the best value found in the literature, thus improving the results that can be obtained when measuring Calcium via semi-parametric Neutron Activation Analysis.
© CEA 2008