The London, Edinburgh and Dublin philosophical magazine and journal of science . Fig-. curve for the specimen sent by Herrn Elster and Geiiel wasnot very different from the two shown. Curves obtainedfrom specimens of the minerals thorite and orangite gave practically the same curves as for thoria. The radiations may be arranged in the following order asregards the power of penetration, beginning with the mostpenetrating. Excited radiations due to Thorium and Radium : ThoriumRadiumPoloniumUranium. The same order of penetration is observed for all the the Radiations from Radioactive Substanc
The London, Edinburgh and Dublin philosophical magazine and journal of science . Fig-. curve for the specimen sent by Herrn Elster and Geiiel wasnot very different from the two shown. Curves obtainedfrom specimens of the minerals thorite and orangite gave practically the same curves as for thoria. The radiations may be arranged in the following order asregards the power of penetration, beginning with the mostpenetrating. Excited radiations due to Thorium and Radium : ThoriumRadiumPoloniumUranium. The same order of penetration is observed for all the the Radiations from Radioactive Substances. 11 substances examined, viz. aluminium and Dutch-metal, tin-foil, and paper. The same order, as will be shown later, holds also tor thepenetrating power of radiations in air. Absorption of the Radiation in Air. The method employed of determining the absorption of theradiation in air was similar to that explained in a previouspaper (Phil. Mag. Jan. 1899, p. 124). Two insulated parallel plates kept a fixed distance of 2 , could be moved by means of a screw to differentdistanc
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
