Radiation dose assessment from NORM residue used in the circular economy
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2024
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SIMPOSIO REPROLAM, 1st
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Resumo
Biota and human beings are exposed to naturally occurring radionuclides present in several natural
resources [1]. Phosphogypsum (PG) is classified as a Naturally Occurring Radioactive Material (NORM)
residue of the phosphate fertilizer industry. PG residue presents in its composition radionuclides of the
natural U and Th decay series and stored in stacks by the phosphate industries, which can represent risks
to environment and human from the radiological protection point of view, such as: atmospheric
contamination, pollution of groundwater, trace elements and radionuclides, radon emanation, inhalation of
dust and direct exposure to gamma radiation. Some possible applications of this residue are soil
conditioners, resulting in an increase of agriculture productivity, or building materials [2].
The Brazilian regulatory body ruled that PG would only be permitted for use in agriculture if 226Ra and
228Ra activity concentrations do not exceed 1 Bq g-1, for each radionuclide [3]. On the other hand, the
safe reuse of PG residue avoids depletion of non-renewable resources, decreases the stacks and
consequent reduces the possible environmental impact. Also adds value to PG, considering the principles
of sustainable development and the principle of the circular economy.
This study's aims were to evaluate the estimated radiation doses in biotas and humans considering two
scenarios: PG stack and application of PG in agriculture, using the ERICA Tool 2.0 [4] and
NORMALYSA Tool 2.0 [5].
For the PG stack, estimated radiation doses (external and internal) to the worker and biota around the
stack were evaluated.
In the agriculture (soil amended with PG residue), the estimated radiation doses to the farmer (external
and internal), consumers of agricultural products (internal) and biota (external and internal) were
evaluated. In this paper, one application per year of PG residue in the soil and the maximum value of the
Brazilian regulatory were considered.
Como referenciar
NISTI, MARCELO; SAUEIA, CATIA; DAMATTO, SANDRA; MADUAR, MARCELO. Radiation dose assessment from NORM residue used in the circular economy. In: SIMPOSIO REPROLAM, 1st, November 5-8, 2024, Recife, PE. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/48887. Acesso em: 13 Mar 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.