Transit dose measurements using alanine and diode-based dosimeters
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2022
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Brazilian Journal of Radiation Sciences
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The growing interest in low-dose (< 100 Gy) radiation processing applications has raised concerns
about accurately measuring the absorbed dose in irradiated materials. Depending on the irradiator
design, the transit time due to the radioactive source movement (or the product itself) until the stable
irradiation position might affect the predicted absorbed dose. This work aims to evaluate the transit
dose in a 60Co Gammacell 220-Nordion irradiator, which has radioactive sources settled at the bottom
of a lead shielding. When the facility is on, the product and the dosimeter are mechanically guided
down to the irradiation position, and hereafter the selected exposure time starts to be counted. At the
end of irradiation, both product and dosimeter rise to the initial position enabling them to be gathered
by the operator. The product is continuously irradiated at different dose rates during its fall and rise
movement, preventing the transit dose from being obtained straightforward. The experimental
approach adopted is to assess the transit time, and thus the transit dose, using an online diode-based
dosimetry system previously calibrated against reference standard alanine dosimeters. The agreement
between the transit doses attained with the diode (0.41 ± 0.02) Gy and alanine (0.38 ± 0.01) Gy
validates the method herein proposed.
Como referenciar
GONCALVES, J.A.C.; SOMESSARI, E.S.R.; SOMESSARI, S.L.; BUENO, C.C. Transit dose measurements using alanine and diode-based dosimeters. Brazilian Journal of Radiation Sciences, v. 10, n. 2A, p. 1-9, 2022. DOI: 10.15392/bjrs.v10i2A.1828. Disponível em: http://repositorio.ipen.br/handle/123456789/33385. Acesso em: 09 May 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.