Evaluation of naturally occurring radionuclides (K, Th and U) in volcanic soils from Fogo Island, Cape Verde

Natural radionuclides K, Th and U were evaluated for the first time on volcanic soils of Fogo Island (Cape Verde) aiming to contribute for the background concentration of radiogenic elements in these soils, assessing radiation risk, and allowing accurate chronological luminescence studies. Potassium and particularly U appear to be more mobilized in the older soils, with a high radon loss when compared to recent ones. External dose rate varies between 0.97 and 3.47 Gy/y. The results obtained in this work are a benchmark for further studies, particularly for the evaluation of modifications due to the 2014-2015 volcanic episode on Fogo Island.

Automated summary

Natural radionuclides K, Th and U were evaluated for the first time in volcanic soils of Fogo Island, showing higher mobilization of potassium and particularly U in older soils, resulting in a higher radon loss. The external dose rate varies between 0.97 and 3.47 Gy/y. The results provide a benchmark for further studies, particularly regarding the impact of the 2014-2015 volcanic episode on Fogo Island.