How to promote a famos mineral water !
The rgranitic ocks of the Massif Central in France are lightly radioactive. At the time when radium was publicised, a famous thermal spa put forward this radioactivity as a way of promotion. However this would not have been the case today. In fact, exposure to radioactivity due to the presence of the descendants of uranium in the rocks does not lead to any health problems, even in granite areas like the Massif Central. The spa guests can drink the water from these springs without worrying about it.