The London, Edinburgh and Dublin philosophical magazine and journal of science . out to 0000055. This is in fairly goodagreement with Cbadwicks value 0*000060. For the measurement of relative ionization in gases pro-duced by the soft rays from radium D, the ionization in avessel was measured when different gases filled the specially designed chamber was used, consisting of a * Chadwick, Proc. Pliys. Soc. xxiv. p. 152 U912). t Lange, Zeitschr. fur ang, C//cm. p. 27» (1899). 2 M 2 532 Miss Jadwiga Szmidt on Distribution of Energy in brass box (10 x 10 X 10 cm.) lined with cardboard and
The London, Edinburgh and Dublin philosophical magazine and journal of science . out to 0000055. This is in fairly goodagreement with Cbadwicks value 0*000060. For the measurement of relative ionization in gases pro-duced by the soft rays from radium D, the ionization in avessel was measured when different gases filled the specially designed chamber was used, consisting of a * Chadwick, Proc. Pliys. Soc. xxiv. p. 152 U912). t Lange, Zeitschr. fur ang, C//cm. p. 27» (1899). 2 M 2 532 Miss Jadwiga Szmidt on Distribution of Energy in brass box (10 x 10 X 10 cm.) lined with cardboard and con-taining two parallel aluminium electrodes 8 cm. apart. Oneof these, cc (fig. 2), was raised to a potential high enoughto ensure saturation, the other, dd, was connected to theWilson-Kaye electroscope, d d was surrounded by a guard-ring, divided from it by an air-gap 4 mm. in width. Theguard-ring was soldered to the walls of the chamber whichwas earthed ; it served to remove the ions produced by thesoft rays excited in the walls when struck by the y rays. Fijr. 2. M-—ih. To £i£cr/foscore The face AB had a small opening 2x2 cm., covered withthin mica and aluminium foil, through which the rays passed,the brass walls being sufficiently thick to stop them. Thewall CD consisted of a glass plate fastened with sealing-waxand also covered with thin aluminium foil to make itconducting. The dimensions, as well as the distance betweenthe source R and the chamber, were so chosen that the beamof 7 rays could not strike the electrodes and walls with theexception of the thin aluminium of the front and back walls;Consequently, only the ionization produced in the gas itself inthe region between the electrodes was measured. Let Ai be the ionization produced at the face AB in a thinlayer of air of unit thickness by rays of a given a distance x from AB the ionization will be K^e^*, so that Different lypes of 7 Rays from Radioactive Substances. 533the observed ionization in air
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
