Zones with low radon potential Zones with low radon potential but in which specific geological factors can facilitate radon transfer to buildings Zones with significant radon potential Radon potential zones defined according to the radon exhalation fluxes from the ground: Source: ASNR. Radon potential zones in metropolitan France defined by the Order of 27 June 2018 ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025 99
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