Distribution of Ra-226, Th-232 and K-40 in soils and sugar cane crops at Corumbatai river basin, São Paulo State, Brazil
Nenhuma Miniatura disponível
Data
2009-06-01
Autores
Conceicao, Fabiano Tomazini da [UNESP]
Bonotto, Daniel Marcos [UNESP]
Jimenez-Rueda, Jairo Roberto [UNESP]
Frutuoso Roveda, Jose Arnaldo [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Pergamon-Elsevier B.V. Ltd
Resumo
The common use of phosphate fertilizers NPK and amendments in sugar cane crops in Brazilian agriculture may increase the Ra-226, Th-232 and K-40 activity concentrations in soils and their availability for plants and human food chain. Thus, the main aim of this study was to evaluate the distribution of Ra-226, Th-232 and K-40 in soils and sugar cane crops in the Corumbatai river basin, São Paulo State, Brazil. The gamma spectrometry was utilized to measure the Ra-226, Th-232 and K-40 activity concentration in all samples. The soil-to-sugar cane transfer factors (TF) were quantified using the ratio between the radionuclide activity concentration in sugar cane and its activity concentration in soil. The results show that, although radionuclides incorporated in phosphate fertilizers and amendments are annually added in the sugar cane crops, if utilized in accordance with the recommended rates, their use does not lead to hazards levels in soils. The soil-to-sugar cane transfer of radionuclides occurred in the following order K-40 > Ra-226 > Th-232. Therefore, under these conditions, radionuclides intake through consumption of sugar is not hazardous to human health. (C) 2009 Elsevier Ltd. All rights reserved.
Descrição
Palavras-chave
Radionuclides in soil, Phosphate fertilizers and amendments, Soil-to-sugar cane transfer, Human health
Como citar
Applied Radiation and Isotopes. Oxford: Pergamon-Elsevier B.V. Ltd, v. 67, n. 6, p. 1114-1120, 2009.