. The London, Edinburgh and Dublin philosophical magazine and journal of science. .Column a, Table III., and curve a, fig. 3 (p. 857), show theresults when aluminium is so used for the absorption of the/3-particles from RaE. Table of the /3-particles from Ra D-i-E. a = Aluminium as absorbing substance ; same number of layers underneath as used for = Aluminium as absorbing substance; air = Tinfoil as absorbing substance; air underneath. Aluminiumin mms. a. b. Tinfoil in equivalent value of mms. Al. c. 0-059 1009 100-0 0059 1000 •118 659 60-7 •099 65-5 •1
. The London, Edinburgh and Dublin philosophical magazine and journal of science. .Column a, Table III., and curve a, fig. 3 (p. 857), show theresults when aluminium is so used for the absorption of the/3-particles from RaE. Table of the /3-particles from Ra D-i-E. a = Aluminium as absorbing substance ; same number of layers underneath as used for = Aluminium as absorbing substance; air = Tinfoil as absorbing substance; air underneath. Aluminiumin mms. a. b. Tinfoil in equivalent value of mms. Al. c. 0-059 1009 100-0 0059 1000 •118 659 60-7 •099 65-5 •177 463 44-4 •139 49-4 •236 34-6 33-9 •179 400 •295 25-7 25-4 •219 32-5 •354 19-4 19-3 •299 22-8 •472 11-6 11-55 •339 19-4 •590 670 697 •459 11-55 •708 4-10 4-51 •599 7*24 •826 2-41 2-41 •744 311 •944 152 1-60 •870 1-87 1-062 080 0-84 •939 1-38 The coefficients of absorption of the /3-particles from Ra D,ThA, RaB, RaE, Act C, ThD, and Ra C, obtained in thismanner, are given in Table IV. Reflexion of the ^-Particles by 3. 857. •010 -(tfO -030 -040 -050 --060 -07QAluminium //v cms. 090 -100 -110 -IPO Table of Absorption in cms. of Al. Ea T) (?). ThA. EaB. EaE. ActO. ThD. EaC. 130 1110 75*0 43-3 28-5 16-3 13-5 The coefficient of absorption of the /3-particles from RaBwas determined by using RaB obtained initially pure byrecoil from radium A, as well as by difference method, whilein the case of ThA and RaD(?) the difference methodalone was used. Act C was also obtained by the recoilmethod, but in some determinations the actinium activedeposit was used. When the logarithm of the ionization given in column a,Table III. is plotted against the thickness of aluminium westill observe an initial drop. This must be attributed to weakradiations possibly belonging to Ra D. In the case of Ra E, Act C, and Th D absorption curves,it is found that down to about 5 per cent, of the initial Phil. Mag. S. 6. Vol. 20. No. 119. Nov
Size: 1685px × 1483px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
