DE FELICE P.

We implemented a laboratory apparatus based on a NaI(TI) γ-ray spectrometer for the assessment of naturally occurring radioactive materials. This apparatus is devoted to the quantitative determination of U, Th and K in rock and soil samples. We analyzed the calibration procedures with particular emphasis to factors which affect accuracy and...

In situ NaI(Tl) γ-ray spectrometric measurements on the Vulcano island show that the magmatic evolution of the main structural units is reflected by the uranium, thorium and potassium concentrations. The results allowed us to delineate two temporal and radiometric districts. The older district comprises lava flows and pyroclastics of mafic...