Determination of Natural Radionuclides (Ra-226, Po-210, Ra-228 and K-40) and Cs-137 in Fish Consumed in the City of São Paulo

Andressa Nery; Barbara Paci Mazzilli; Marcelo Bessa Nisti; Catia  Heloisa Rosignoli Saueia

doi:10.15392/2319-0612.2022.1941

Autores

Andressa Nery IPEN , https://orcid.org/0000-0002-1628-8833 (não autenticado)
Barbara Paci Mazzilli ,
Marcelo Bessa Nisti ,
Catia Heloisa Rosignoli Saueia ,

DOI:

https://doi.org/10.15392/2319-0612.2022.1941

Palavras-chave:

alpha spectrometry, gamma spectrometry, natural and artificial radionuclides, marine fish

Resumo

The aim of the study was to determine the activity concentration of the natural radionuclides (²²⁶Ra, ²¹⁰Po, ²²⁸Ra and ⁴⁰K) and artificial radionuclide ¹³⁷Cs in the muscle of the marine fish species most consumed in the city of São Paulo and to evaluate the annual effective dose due to the consumption of the fish. Samples were collected in the supermarket chain Extra and Carrefour and in the distribution center CEAGESP. Six fish species were selected among the most available and consumed in São Paulo city: anchovy, tuna, dogfish, croaker, hake and sardine. After the sample preparation procedures, the determination of ²²⁶Ra, ²²⁸Ra, ⁴⁰K and ¹³⁷Cs was carried out by gamma spectrometry and the determination of ²¹⁰Po by alpha spectrometry. The results obtained for all the species studied are below the limits adopted by the Brazilian Standards for ¹³⁷Cs and, therefore, their consumption offers no risk due to the ingestion of this radionuclide. The concentration obtained for the radionuclides ²²⁶Ra, ²¹⁰Po, ²²⁸Ra and ¹³⁷Cs in the fish samples analized are low and of the same order of magnitude as data from literature. The results obtained for the doses, for all the species studied, showed that their consumption offers no risk of exposure due to the ingestion of the analyzed radionuclides.

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Biografia do Autor

Andressa Nery, IPEN,

Mestranda em Tecnologia Nuclear
Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN/USP

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