Investigation of the Radon exhalation potential in the PACA region. Phase II: case of high potential exhalation areas in Medium Champsaur (05) and South Esterel (83). Final report

After having recalled the results of the first phase of the study and the objectives of the second phase, the authors present the methodology: uranium and thorium analysis on rock, radon-222 activity measurement in soil gases, and gamma radiation measurement. They discuss the influence of rock uranium content on radon exhalation (natural contextual and physical phenomena governing radon transport, radon properties, uranium geochemistry). They report the results obtained in the two considered areas (meteorological conditions, radon 222 content in soils, uranium and thorium contents in geological formations, influence of geological formation type and distribution on radon activity)