Calibration methods for in situ gamma spectrometry applied in radiation protection and dosimetry

The calibration methods for in-situ gamma spectrometry systems used CIEMAT include semiempirical approaches using point sources, pure mathematical calibrations using the ISOCS software and a stripping method developed at CIEMAT. The two first procedures give information about the activity concentration in the soil, and the third method provides distributions of dosimetric quantities as a function of the photon energy. While the three methods allow to calculate the terrestrial dose rate, a new simplified method is suggested to estimate the cosmic dose rate from the in-situ spectra. As a consequence, in-situ gamma spectrometry is probably the only instrument that permits to measure both quantities simultaneous but separately.