Abstract
The activity concentrations of 40K, 232Th, and 238U in the characteristic rocks of the Modane-Aussois region (Western Alps, France) were determined using an HPGe gamma-ray spectrometry system. The activity concentrations of 40K varied from 18 Bqkg−1 (limestone dolomite) to 392 Bqkg−1 (calcschist), while those of 232Th varied from 0.7 Bqkg−1 (limestone dolomite) to 18 Bqkg−1 (calcschist). The activities associated with 238U ranged from 9 (quartzite) to 29 Bqkg−1 (dolomite). In the investigated rock samples, concentrations of 238U (ppm) and 40K (%) had a strong negative correlation.
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