I would like first to acknowledge all the colleagues from both the “old” generation and the “new” with whom I have worked for 20 years; in particular, I have special thoughts for my mentor Claude Allègre without whom nothing could have been possible. The noble gas “Paris“ group would not have existed without Thomas, Philippe, Dédé, Petit Chef and Fabien. I am grateful for what they did and this work is dedicated to them. I have also special thoughts for my PhD students (Cécile, Lorraine, Claire, Claire, Stéphane, Aude, Marine) who through their work contributed hugely to...

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