Application of semi-empirical model for the evaluation of radium activity in phosphogypsum used as component of clinker
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2019
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
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Phosphogypsum is a residue that has been used by the cement industry as a substitute for the natural gypsum, used
as a clinker additive during the production of Portland cement. There is a potential increase in this residue use
since the large amount of phosphogypsum is generated as outcome of the phosphate fertilizer industries. However,
phosphogypsum can be considered a source of radioactive contamination since it has 226Ra in its composition.
Depending on the concentration of 226Ra, from the radiological protection point of view, this may cause a problem
because this radionuclide and its direct decay product 222Rn along with other decay products, represent the largest
fraction of radiation internal dose received by people. In order to evaluate the level of radiological risk that may
be associated with the use of phosphogypsum, it is necessary to identify the concentration of 226Ra in building
material. The aim of this research is to analyze the samples of phosphogypsum in relation to the concentrations
of 226Ra, determined indirectly through 222Rn activity measurements. This measurement process has the advantage
of being fast, convenient and relatively inexpensive when compared to traditional 226Ra concentration in samples
measurement methods. Proposed physical-mathematical model was used to establish radium concentration from
radon exhalation rate from cement mortar samples. The 222Rn activity measurements were performed with a
portable detector with cubic phosphate samples with dimensions of 50x50x50mm3 allocated in a closed
atmosphere of sampling chamber until secular equilibrium was reached. Obtained concentrations of radium
activity in studied samples of phosphogypsum and cement mortars were found below the limits recommended by
CNEN and international regulation.
Como referenciar
GERALDO, RICARDO R.; PASCHUK, SERGEI A.; BARRETO, RAFAEL C.; ZAHN, GUILHERME S.; SILVA, PAULO S.C. da; SILVA, AMANDA C.M.da; NARLOCH, DANIELLE C.; ARAUJO, ISABELLE C. Application of semi-empirical model for the evaluation of radium activity in phosphogypsum used as component of clinker. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 965-974. Disponível em: http://repositorio.ipen.br/handle/123456789/30540. 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.