Natural radionuclides content and radon exhalation rate from brazilian phosphogypsum piles
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Journal of Radioanalytical and Nuclear Chemistry
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Phosphogypsum is a waste of the wet-acid
process for producing phosphoric acid from phosphate
rock. For every ton of phosphoric acid obtained, from the
reaction of phosphate rock with sulphuric acid, about four
tons of phosphogypsum are produced. The level of radioactivity present in the phosphogypsum, among other
impurities, prevents its reuse for a variety of purposes.
Large quantities of phosphogypsum have been produced
worldwide. In 2006, the annual production was estimated
to be about 170 million tons. Brazilian annual production
of phosphogypsum reaches 5.5 million tons. Brazil, like
other countries that produce phosphate fertilizer, tries to
find solutions for the safe applications of phosphogypsum,
in order to minimize the impact caused by its disposal.
Most of the worldwide phosphogypsum is stockpiled,
posing environmental concerns. The monitoring of air and
groundwater pollution, radon exhalation rate and direct
exposure to gamma radiation for workers should be considered. The aim of this study is to evaluate the natural
radionuclides content and the radon exhalation rate from
phosphogypsum piles from Ultrafertil and Fosfertil fertilizer industries. Samples of this material were analyzed by
gamma ray spectrometry for their radionuclide content.
Radon exhalation rate was measured by the activated
charcoal collector method. A theoretical model for radon
exhalation calculation, suggested by UNSCEAR, was
applied in order to corroborate the experimental results.
Como referenciar
NISTI, MARCELO B.; CAMPOS, MARCIA P. de; MAZZILLI, BARBARA P. Natural radionuclides content and radon exhalation rate from brazilian phosphogypsum piles. Journal of Radioanalytical and Nuclear Chemistry, v. 299, n. 1, p. 261-264, 2014. DOI: 10.1007/s10967-013-2752-z. Disponível em: http://repositorio.ipen.br/handle/123456789/3994. Acesso em: 20 Mar 2026.
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.