Réponse :
1) This document is the extract of the novel Curie and Radioactivity from Paul Stathern. This extract underlines that Röntgen discovered X-Rays. After that, Becquerel tried also to « make » X-Rays with fluorescent materials. But he finally discovered something new, accidentally, which make him wonder a new form of radiation.
3) Becquerel accidentally discovers radioactivity while researching the fluorescence of uranium salts.
Bon courage pour la suite :)
