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Determination of the gamma emission intensities of 61Cu
Frédéric Juget1, L Desorgher1, M Teresa Durán1
1Institute of Radiation Physics (IRA), Lausanne University Hospital (CHUV) and University of Lausanne, Lausanne, Switzerland.
Abstract:
The gamma emission probabilities of 61Cu were determined using a high-purity germanium spectrometer using a sample standardized by Triple to Double Coincidence Ratio (TDCR), CIEMAT/NIST. A total of 24 gamma-ray lines were measured and compared with previous measurements performed more than 35 years ago. Results present a large uncertainty reduction compared to previous evaluations, in particular for the two main lines at 283 and 656 keV going down to 1.3 % and 1.1 % respectively, compared to around 15 % in the databases. Only the intensities for the two lines at 1662 and 1729 keV disagree with previous measurements giving a discrepancy above 20 %. Seven lines were not observed due to their expected low intensities and additional measurements have to be performed. This work improves considerably the emission probabilities values and their uncertainties in comparison with the current available data.
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