Monte Carlo simulation to positron emitter standardized by means of 4'pi''beta'-'gamma' coincidence system
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Applied Radiation and Isotopes
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The present work describes the methodology for predicting the behavior of extrapolation curves obtained in radionuclide standardization by 4pb-g coincidence measurements, applied to 22Na, developed at the Laborato´rio de Metrologia Nuclear of IPEN-CNEN/SP (LMN–Nuclear Metrology Laboratory). The LMN system consists of a proportional counter (PC) in 4p geometry coupled to a single or a pair of NaI(Tl) scintillation crystals. Two standardization techniques were used: the Sum-Peak and the Nuclear-Peak methods. The theoretical response functions of each detector have been calculated using the MCNPX Monte Carlo code. The code ESQUEMA, developed at LMN, has been used for calculating the extrapolation curve in the 4pb-g coincidence experiment. Modifications were performed in order to include response tables for positrons and coincidences with annihilation photons. From the calibration results it was possible to extract both the activity value and the positron emission probability per decay. The latter was compared with results from the literature.
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DIAS, MAURO S.; TONGU, MARGARETH L.O.; TAKEDA, MAURO N.; KOSKINAS, MARINA F. Monte Carlo simulation to positron emitter standardized by means of 4'pi''beta'-'gamma' coincidence system: application to 22Na. Applied Radiation and Isotopes, v. 68, n. 7-8, p. 1362-1366, 2010. DOI: 10.1016/j.apradiso.2009.12.022. Disponível em: http://repositorio.ipen.br/handle/123456789/4596. 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.