LAUSR

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.