Estimation of scattered radiation influence on neutron beams at a calibration laboratory using Monte Carlo simulation of a long counter
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Brazilian Journal of Radiation Sciences
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At the Neutron Calibration Laboratory (LCN) of IPEN/CNEN, a 241AmBe source was used to test and calibrate
neutron detectors. The neutrons emitted by the source reach the detector as intended, but they also scatter
undesirably from the building's floor, ceiling, and walls, leading to indirect detection. A Long Counter (LC)
detector was modeled using the MCNPX Monte Carlo code. The objective of this study was to measure the
contribution of scattered radiation at the LCN / IPEN, and to determine the fluence rate, at different points in
the calibration room at source-to-detector distances of 100 cm and 150 cm; subsequently, the results were
compared with those of the Brazilian Laboratory of Metrology of Ionizing Radiation (LNMRI). The results show
that the fluence rates of LCN / IPEN are comparable to those of this neutron laboratory for the 100 and 150 cm
source-to-detector distances using a 241AmBe source (37 GBq). The results show that the calibration of neutron
detectors should be performed at distances less than 100 cm, where the contribution of scattered radiation is
within the 40% limit recommended by ISO 8529-1.
Como referenciar
ALVARENGA, T.S.; FERNANDES, S.S.; PEREIRA, W.W.; MAYHUGH, M.R.; CALDAS, L.V.E. Estimation of scattered radiation influence on neutron beams at a calibration laboratory using Monte Carlo simulation of a long counter. Brazilian Journal of Radiation Sciences, v. 11, n. 2, p. 1-12, 2023. DOI: 10.15392/2319-0612.2023.2249. Disponível em: http://repositorio.ipen.br/handle/123456789/34218. 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.