Disintegration rate and gamma-ray emission probability per decay measurement of Cu-64
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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This work aims to present the 64Cu standardization method developed in the
Nuclear Metrology Laboratory (LMN) at the IPEN-CNEN/SP, using a 4
coincidence system, and the measurement of the gamma-ray emission probabilities
per decay of 1345.7 keV of 64Cu by means of a REGe gamma-ray spectrometer.
The 4
coincidence system consists of a gas- flow proportional counter with
4 geometry and using 90% Ar + 10% CH4 gas at 0.1 MPa, as the detector,
coupled to two NaI(Tl) crystal for the gamma-ray emission detection. The events
were registered by means of a Time to Amplitude Converter (TAC) associated with
a Multi-Channel Analyzer. Two gamma-ray windows were set for the coincidence
measurements, one including the positron-annihilation quanta and the other located
at the total absorption energy peak of the 1345.7 keV gamma-ray transition. The
64Cu was obtained by irradiating 0.3mg of metallic cooper in the IEA-R1 research
reactor under a 1 1013 cm2 s1 thermal neutrons flux. To obtain the 64Cu solution
the foil irradiated was dissolved in 20 L of HNO3 65% and after that was diluted
in 20 mL of 0.1M HCl. The activity was determined by means of the extrapolation
curve from eight irradiations, normalized by means of the germanium measurements.
The Kawada factor to correct the inefficiency for beta plus and beta minus in the
N4 has been applied. The gamma-ray full efficiency peak curve of the germanium
spectrometer was measured at 17.9 cm of source-detector distance, in the energy
range from 244 keV to 2754 keV, by measuring flamed-sealed ampoules of 24Na, 60Co,
133Ba, 137Cs, and 152Eu standardized at the LMN. The sample for measurement in
the spectrometer was prepared in flame-sealed ampoule with 1 mL of the diluted
solution. The gamma-ray emission probability per decay of the 1345.7 keV transition
of 64 Cu was (0.472 0.010)%, in agreement with the literature.
Como referenciar
KOSKINAS, M.F.; YAMAZAKI, I.M.; MOREIRA, D.S.; TAKEDA, M.N.; DIAS, M.S. Disintegration rate and gamma-ray emission probability per decay measurement of Cu-64. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 55-55. Disponível em: http://repositorio.ipen.br/handle/123456789/28752. Acesso em: 15 Jun 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.