Assertion: gamma ray | /r/AtLocation | the 1900s
Facets:
value: by paul villard
type: OTHER
Source sentences:
text: Although Gamma rays were first observed in the 1900s by Paul Villard, a French chemist when he was investigating radium, Ernest Rutherford named them “Gamma Rays” (following the order after alpha rays and beta rays – other particles from nuclear radiation).