. The interpretation of radium and the structure of the atom . Fig. I.—Becquerels Uranium Fig. 2.—Welsbach Mantle imprinted by its Own Rays. To face p. 7 URANIUM RADIATION 7 phosphorescent substance which was then exposedto sunhght. By great good fortune M. Becquerelchose as the particular phosphorescent body a prep-aration of uranium, and found as the result of theexperiment that the photographic plate beneath thepreparation was darkened. The preparation had givenout rays which, unlike sunlight, were capable of pene-trating the black paper. It was soon found that theserays, like the
. The interpretation of radium and the structure of the atom . Fig. I.—Becquerels Uranium Fig. 2.—Welsbach Mantle imprinted by its Own Rays. To face p. 7 URANIUM RADIATION 7 phosphorescent substance which was then exposedto sunhght. By great good fortune M. Becquerelchose as the particular phosphorescent body a prep-aration of uranium, and found as the result of theexperiment that the photographic plate beneath thepreparation was darkened. The preparation had givenout rays which, unlike sunlight, were capable of pene-trating the black paper. It was soon found that theserays, like the X-rays, even penetrated thin platesof metal, for when such a thin plate was interposedbetween the preparation and the film darkening stilloccurred. But one day, the sun being obscured, theplate and the phosphorescent uranium preparationupon it were set aside in a dark drawer for some weeks,and M. Becquerel, wishing to see if any darkening hadoccurred without the sunlight, developed the plate asit was. It was found that darkening had gone onjust as much in the darkness as in the light. Furthe
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradioac, bookyear1922
