Natural radionuclide and 137Cs activity concentration in soils of the Brazilian State of Sergipe and their correlation with environmental characteristics
DOI:
https://doi.org/10.15392/2319-0612.2024.2525Palabras clave:
natural radionuclides, soil radioactivity mapping, external doseResumen
Radionuclides occur naturally in the environment, exposing living organisms to ionizing radiation. In addition, human activities have introduced artificial radionuclides such as 137Cs, among others, into the environment. To better understand the occurrence and behaviour of radionuclides in soil, several countries have developed radiological studies and constructed maps. An effort has been made in Brazil to assess the radioactivity in the soils of the country. In this study, the activity concentrations of natural radionuclides 40K, 226Ra and 228Ra, and artificial 137Cs were determined in samples at a depth of 20 cm collected from the soils of the Brazilian State of Sergipe, in a regular grid of 25 km x 25 km. Samples were analysed by gamma-ray spectrometry with the use of hyperpure germanium detectors. The results were correlated with the type of soil, geology, and climate characteristics of the State. The median activity concentrations of 40K, 226Ra, and 228Ra were 210.4 Bq.kg-1, 12.33 Bq.kg-1, and 18.69 Bq.kg-1, respectively. The results are lower than those reported for soils from other Brazilian States in the same region. The activity concentration of 137Cs was lower than the minimum detectable activity. The activity concentration of 40K in young soils of the semi-arid region was higher than that found in most weathered soils of the rainy regions due to the very low pluviometry of the semi-arid area. Higher activity levels of 226Ra were found in Planosol and for 228Ra it was found in the weathered soils (Acrisol) of the coastal zone. Maps of the distribution of the studied radionuclides were designed. The median value of the outdoor absorbed dose rate in air (Dnat) calculated for the soils of the State of Sergipe is lower when compared with other Brazilian States and the UNSCEAR’s worldwide median value.
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Referencias
United Nations. Sources and Effects of Ionizing Radiation. Sources and Effects of Ionizing Radiation. United Nations Scientific Committee on the Effects of Atomic Radiation, 2000. Report to the General Assembly, with scientific annexes. United Nations sales publication E.00.IX.3. United Nations, New York, ISBN 92-1-142238-8, 2000.
GAVRILESCU, M.; PAVEL L.V.; CRETESCU, I. Characterization and remediation of soils contaminated with uranium. Journal of Hazardous Materials, v. 163, p. 475–510, 2009.
ARNEDO, M. A.; RUBIANO, J.G.; ALONSO, H.; TEJERA, A.; GONZÁLEZ, A.; GONZÁLEZ, J.; GIL, J.M.; RODRÍGUEZ, R.; MARTEL, P.; BOLIVAR; J.P. Mapping natural radioactivity of soils in the eastern Canary Islands. Journal of Environmental Radioactivity, v. 166, p. 242–58, 2017.
CINELLI, G.; TOLLEFSEN, T.; BOSSEW, P.; GRUBER, V.; BOGUCARSKIS, K.; DE FELICE, L., DE CORT, M. Digital version of the European Atlas of natural radiation. Journal of Environmental Radioactivity, v. 196, p. 240–52, 2019.
GARBA, N. N; RAMLI, A. T.; SALEH, M. A.; SANUSI, M. S.; GABDO, H. T. Terrestrial gamma radiation dose rates and radiological mapping of Terengganu state, Malaysia. Journal of Radioanalytical and Nuclear Chemistry, v. 303, p. 1785 - 1792, 2015.
TURHAN, Ş. A. KÖSE, A.; VARINLIOĞLU, A.; ŞAHIN, N.K.; ARIKAN, İ.; OĞUZ, F.; YÜCEL, B.; ÖZDEMIR. T. Distribution of terrestrial and anthropogenic radionuclides in Turkish surface soil samples. Geoderma, v. 187–188, p. 117–24, 2012.
UGUR, F. A.; TURHAN, S.; GOREN, E.; GEZER, F.; YEGINGIL, Z.; SAHAN, H.; SAHAN. M.; TEL, E.; KARAHAN, G. A survey of distribution of terrestrial radionuclides in surface soil samples in and around the Osmaniyeprovince, Turkey. Radiation Protection Dosimetry, v. 154, p. 483-489, 2013.
FILGUEIRAS, R. A.; SILVA, A. X.; RIBEIRO, F. C. A.; LAURIA, D. C.; VIGLIO, A. P. Baseline, mapping and dose estimation of natural radioactivity in soils of the Brazilian State of Alagoas. Radiation Physics and Chemistry, v. 167, 108332, 2020.
GARCÊZ, R. W. D.; LOPES, J. M.; PEREZ, S. S.; LAURIA, D. C.; VIGLIO, E. P.; CUNHA, F. G.; RIBEIRO, F. C. A.; da Silva, A. X. Activity concentration and mapping of radionuclides in Espírito Santo State soils, Brazil. Radiation Physics and Chemistry, v. 167, 108209, 2020
LEAL, A. L. do C.; LAURIA, D. C.; RIBEIRO, F. C. A.; VIGLIO, E. P.; FRANZEN, M. LIMA, E. A. M. Spatial distributions of natural radionuclides in soils of the State of Pernambuco, Brazil: Influence of bedrocks, soils types and climates. Journal of Environmental Radioactivity, V. 211, 106046, 2020,
MALANCA, A.; PESSINA, V.; DALLARA, G. Assessment of the Natural Radioactivity in the Brazilian State of Rio Grande Do Norte: Health Physics, V. 65, P. 298–302, 1993.
SOUZA, E. M. Rastreamento gama terrestre: estimativa da exposição da população à radioatividade em áreas urbanas. 2017. PhD. Thesis. CNEN, IRD
YOSHIMURA, E. M.; OTSUBO, S. M.; OLIVEIRA, R. R. R.; Gamma ray contribution to the ambient dose rate in the city of São Paulo, Brazil. Radiation Measurements, V. 38, P. 51-57, 2004.
PEIXOTO, C. M., FERNANDES, P. M. R.; RODRIGUES, P. C. H.; CARVALHO FILHO, C. A.; FELICIANO, V. M. D. Distribuição das Concentrações de Atividade de 238U e 232Th em Amostras de Solo do Estado de Minas Gerais. Brazilian Journal of Radiation Sciencies, v. 4, n. 2, 2016.
PERES, A. C. Modelo para o estabelecimento de valores orientadores para elementos radioativos no solo. PhD. Thesis. Universidade de São Paulo, 2007.
RIBEIRO, F. C. A.; LAURIA, D. C.; SILVA, J. I. R.; LIMA, E. S. A.; AMARAL SOBRINHO, N. M. B.; PEREZ, D. V. Baseline and quality reference values for natural radionuclides in soils of Rio de Janeiro State, Brazil. Revista Brasileira de Ciência do Solo, v. 42, e0170146, 2018.
IBGE. Estado do Sergipe, IBGE - Instituto Brasileiro de Geografia e Estatistica 2022. https://cidades.ibge.gov.br/brasil/se/panorama (accessed February 24, 2022).
CASTELHANO, F. J.; PINTO, J. E. S. D. S. Tendências e alterações climáticas no Estado de Sergipe, nordeste do Brasil. Revista do Departamento de Geografia, v. 42, e185565, 2022.
GOMES, J. B. V.; ARAÚJO FILHO, J. C. de; SIQUEIRA, O. J. W. de; CARVALHO FILHO, A. de; SOBRAL, L. F. Principais classes de solo do Estado de Sergipe. In: Recomendações para o uso de corretivos e fertilizantes no Estado de Sergipe, 2007.
SANTOS, J. O. S.; GROVES, D. I.; HARTMANN.; L. A.; MOURA, M. A.; MCNAUGHTON. Gold deposits of the Tapajós and Alta Floresta Domains, Tapajós–Parima orogenic belt, Amazon Craton, Brazil. Mineralium Deposita, v. 36, p. 278–99, 2001.
BHATTACHARJEE, S.; GHOSH, S. K.; CHEN, J. Semantic Kriging for Spatio-temporal Prediction. Springer Singapore, 2019.
SAITO, K.; JACOB, P. Gamma ray fields in the air due to sources in the ground. Radiation Protection Dosimetry, v. 58, p. 29–45, 1995.
FILGUEIRAS, R. O.; GARCÊZ, R. W. D.; SILVA, L. B.; LOPES, J. M.; RIBEIRO, F. C. A.; VIGLIO, E. P.; SILVA, A. X. 137Cs activity concentration in soil of Alagoas State, Brazil. Applied Radiation and Isotopes, v. 170, 109607, 2021.
FILGUEIRAS, R. DE A. Padrões de concentrações, mapeamento e estimativa de dose de radionuclídeos naturais em solos do Estado de Alagoas e distribuição da concentração de 137Cs. Ph.D. thesis. Universidade Federal do Rio de Janeiro, 2019.
FILGUEIRAS, R. A.; DA SILVA, A. X.; DOMINGUES, A. M.; RIBEIRO; F. C. A.; VIGLIO, E. P. Relationships between natural radionuclides activity concentration in soils of the State of Alagoas, Brazil and WRB/FAO soil classification, types of parental rocks and rainfall variability. Applied Radiation and Isotopes, v. 187, 110309, 2022.
LINSALATA, P. MORSE, R. S.; FORD, H.; EISENBUD, M.; FRANCA, E. P.; DE CASTRO, M. B.; LOBAO, N.; SACHETT, I.; CARLOS, M. An Assessment of Soil-to-plant Concentration Ratios for Some Natural Analogues of the Transuranic Elements. Health Physics, v. 56, p. 33–46, 1989.
LEAL, A. L. C.; LAURIA, D. C.; RIBEIRO, F. C. A. Natural radionuclide levels and the associated radiological risks in soils from the three mesoregions of Pernambuco state, Brazil. Journal of Radioanalytical and Nuclear Chemistry, v. 324, p. 521–531, 2020.
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