Dosimetric evaluation of individuals to 238U series, 232Th series and 40K radionuclides present in Brazilian ornamental rocks using computational simulation
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Ecotoxicology and Environmental Safety
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Granites are widely used in construction and they may be potential sources of ionizing radiation, due to the
presence of radionuclides such as 40K and decay products from 238U series and 232Th series. These radionuclides
occur in the minerals constituting the rocks. To evaluate the doses in humans exposed to 40K, and decay products
from 238U series and 232Th series radiation, a room with dimensions of 4.0 × 5.0 × 2.8m3, with uniformly
distributed radiation source on the floor of granitic rocks, was computationally modeled. Adult individuals were
represented in the virtual scenario by two virtual anthropomorphic phantoms FASH3 and MASH3, incorporated
simultaneously in the software MCNPX 2.7.0. The mean energy deposited on each organ and tissue of FASH3 and
MASH3 phantoms was determined using the MCNPX F6 tally (MeV/g/particle), while the photon flux within the
room was calculated with the MCNPX F4 tally (MeV/cm2/particle). The organs that obtained the highest conversion
coefficients CC[HT] (Sv/Gy) were the red bone marrow (0.94), skin (0.90), breast (0.81) and bladder
(0.73) for the FASH3; skin (0.89), gonads (0.88), breast (0.79) and bladder (0.70) for the MASH3. The simulated
air absorbed dose rates varied between 23.4 (11%) and 25.8 (12%) nGy/h, and the annual dose rates were 0.10
(6%) and 0.11 (6%) mSv/year. These results presented acceptable statistical uncertainties and they are in
agreement with the literature. Fluency of photons pointed to the central region of the room floor as the place of
greatest exposure. The results showed that the organs closer to the radiation source had the highest deposited
energy values. Based on the annual effective dose data obtained, it was possible to note that the values are within
the literature. We believe that the methodology used will allow the investigation of any ornamental material that
emits natural radiation.
Como referenciar
PEREIRA, MARCO A.M.; SILVEIRA, LUCAS M.; NANNINI, FELIX; NEVES, LUCIO P.; PERINI, ANA P.; SANTOS, CARLA J.; BELINATO, WALMIR; SANTOS, WILLIAM S. Dosimetric evaluation of individuals to 238U series, 232Th series and 40K radionuclides present in Brazilian ornamental rocks using computational simulation. Ecotoxicology and Environmental Safety, v. 173, p. 401-410, 2019. DOI: 10.1016/j.ecoenv.2019.02.038. Disponível em: http://repositorio.ipen.br/handle/123456789/30408. 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.