Monte Carlo simulation of activity measurements by means of 4 pi beta-gamma coincidence system
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2003
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LATINAMERICAN SYMPOSIUM ON NUCLEAR PHYSICS, 5th; REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 26
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This work describes the methodology developed by the Nuclear Metrology Laboratory (LMN) from IPEN, in Sio
Paulo, Brazil, for simulating all detection processes in a 47(,X)-y coincidence system by means of the Monte Carlo
technique. In this way, it is possible to predict the behavior of the observed activity as a function of the a 47
detector efficiency.
In this approach, the information contained in the decay scheme is used for determining the contribution of all
radiation emitted by the selected radionuclide, to the measured spectra of each detector. This simulation yields the
shape of the coincidence spectrum, allowing the choice of suitable gamma-ray windows for which the activity can be
obtained with maximum accuracy. Therefore, this simulation shall be able to predict a detailed description of the
extrapolation curve, mainly in the region where the a 47(Þ,X) efficiency approaches 100%, which is experimentally
unreachable due to self absorption of low energy electrons in the radioactive source substrate
The theoretical work is being developed with MCNP Monte Carlo code, applied to a gas-flow proportional counter
of a 47 geometry, coupled to a pair of Nal(Tl) crystals. The calculated efficiencies are compared to experimental
values obtained at the LMN of IPEN. The extrapolation curve will be obtained by means of another Monte Carlo
algorithm, being developed in the present work, to take into account fundamental characteristics of a complex decay
scheme, including different types of radiation and transitions. The present paper shows preliminary calculated values
obtained by the simulation and compared to experimental results.
Como referenciar
TAKEDA, M.N.; DIAS, M.S.; KOSKINAS, M.F. Monte Carlo simulation of activity measurements by means of 4 pi beta-gamma coincidence system. In: LATINAMERICAN SYMPOSIUM ON NUCLEAR PHYSICS, 5th; REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 26, Sept. 1-5, 2003, Santos, SP. Abstracts... p. 41. Disponível em: http://repositorio.ipen.br/handle/123456789/21836. Acesso em: 30 Dec 2025.
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.