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01-09-2018 | Original Article | Issue 17/2018

Environmental Earth Sciences 17/2018

Mapping of the concentration of natural radionuclides in the Fundão Island, RJ, Brazil supported by geoprocessing and IDW interpolation

Journal:
Environmental Earth Sciences > Issue 17/2018
Authors:
Renata Coura Borges, Cláudio Fernando Mahler, Vanessa Godoy Caldas, Ana Paula da Silva, Alfredo Victor Bellido Bernedo

Abstract

This work aims to determine the concentration activities of 226Ra, 228Ra and 40K radionuclides in soil samples from Fundão Island, Rio de Janeiro, using the gamma spectrometry technique with a hyper-pure germanium detector. The concentration found for 226Ra in the evaluated soil samples showed an average 42.21 Bq kg−1, a value within ranges found in national and international studies. For concentrations of 228Ra, the average found were around 131.23 Bq kg−1, being higher than the values found for soils in national and international studies. The 40K presented average values around 543.35 Bq kg−1, therefore within the range found for soils in both national and international literature. Amongst the analyzed samples and the determined elements, the 228Ra was the highest concentration detected. This result suggests that in these soils, the forming minerals are more concentrated in 232Th.

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