. The London, Edinburgh and Dublin philosophical magazine and journal of science. her, Proc. Roy. Soc, A. vol. lxxx. p. 186 (1908). Reflexion of the fi-P articles hy Matter. 851 foils are placed directly on top of the thin radioactive material,and this is placed at some distance below the electroscope,an entirely different initial portion of the curve is is clearly shown by the following experiments. Table the corresponding curves in fig. 1 show the results. Table I. Ionization. Ionization. Tinfoilequivalent in EaE. Acta ThA+D. mms. of Al. EaE. Acta ThA+D. 00000 1000 100-0
. The London, Edinburgh and Dublin philosophical magazine and journal of science. her, Proc. Roy. Soc, A. vol. lxxx. p. 186 (1908). Reflexion of the fi-P articles hy Matter. 851 foils are placed directly on top of the thin radioactive material,and this is placed at some distance below the electroscope,an entirely different initial portion of the curve is is clearly shown by the following experiments. Table the corresponding curves in fig. 1 show the results. Table I. Ionization. Ionization. Tinfoilequivalent in EaE. Acta ThA+D. mms. of Al. EaE. Acta ThA+D. 00000 1000 100-0 1000 000 1000 100-0 1000 0025 100-0 101-3 100-1 •04 116-3 121-8 1203 0050 100-3 •08 1060 120-5 119-8 010 100-8 103-0 105-8 •12 92-0 1140 114-9 020 103-3 1050 105-9 •16 79-9 105-4 1091 030 103-7 105-5 1060 •20 95-7 1069 035 102-3 •24 91-8 1000 040 106-9 107-0 •28 94-4 045 100-9 •32 73-2 050 107-4 109-8 •40 58-8 82-0 059 lbb-s •52 67-4 090 97-1 105-5 101-6 •64 57-8 120 87-5 99-0 99-4 150 82-0 177 71-0 236 75-0 90-6 295 48-] 354 56-1 79-4 •413 30-8 Kar. £ TMtD ;0 -010 -020 -030 0 -010 -020 -030 0 -010 -020 -030 -040thicm£ss,ofAluminium w cms. £52 Dr. A. F. Kovarik on tlie Absorptio?i and The first column gives the thickness of the absorbinglayers of aluminium placed directly on top of the thin activelayer. The second, third, and fourth columns give the ioni-zation observed in the electroscope. The ionization, whenno absorbing matter was on top of the active material, istaken as 100. The remaining columns give similar resultswhen tinfoil was used for which the equivalent absorbingthickness of aluminium is given. This equivalent value oftinfoil in terms of aluminium was found from the latterportions of the absorption curves, where, as will be seenfrom later work, the absorption curves are similar in radioactive materials were used in this determinationwith very similar results. It should be stated here that the opening of the electr
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