Soil isotopic abundances reconstructed by using simulated spectra.

The Rad Monitor project’s goal is to determine the concentration of radioisotopes in the Veneto territory by measuring the g rays emitted by the ground surface. To accomplish this job, several detecting techniques have been used: rock sampling (the samples were analyzed in laboratory), in situ measurements and airborne survey. In situ and airborne detectors have to be carefully calibrated and we have developed a calibration procedure based on the reconstruction of mono-isotope spectra (hereafter called sensitive spectra) for each of the radioisotopes investigated in our analysis. The acquired in situ spectra are then fitted by using these mono-isotope spectra. Portable detectors were calibrated in selected sites with well known concentrations of 40K, 238U, and 232Th and 137Cs. The procedure was described in detail in a previous work. In this contribution, we investigate a different approach to analyze the in situ spectra and we report the preliminary achieved results .