jun 19, 1896 - Henri Becquerel
Description:
a French physicist, reads of William Roentgen's experiments with X-rays, and learns that they can cause certain materials to fluoresce.Becquerel eventually discovers that the uranium in this compound is the magic ingredient. All compounds with uranium in them will fog a photographic plate; compounds without uranium will not. Becquerel therefore calls the new radiation "uranic rays".
Added to timeline:
Date:
jun 19, 1896
Now
~ 129 years ago