Antoine Henri Bесԛuеrеl (15 Dесеmbеr 1852 – 25 Auguѕt 1908) wаѕ a Frеnсh physicist, Nоbеl laureate, аnd the firѕt реrѕоn to diѕсоvеr еvidеnсе of rаdiоасtivitу.
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If one places between the phosphorescent substance and the paper a piece of money or a metal screen pierced with a cut-out design, one sees the image of these objects appear on the negative. Henri Becquerel
If one places between the phosphorescent substance and the paper a piece of money or a metal screen pierced with a cut-out design, one sees the image of these objects appear on the negative.
When one then develops the photographic plate, one recognizes that the silhouette of the phosphorescent substance appears in black on the negative. Henri Becquerel
When one then develops the photographic plate, one recognizes that the silhouette of the phosphorescent substance appears in black on the negative.