﻿Homogeneous 
  Secondary 
  Rontgen 
  Radiations. 
  575 
  

  

  absorbed 
  than 
  the 
  homogeneous 
  rays, 
  consequently 
  the 
  curve 
  

   clips 
  initially 
  and 
  finally 
  becomes 
  horizontal. 
  The 
  absorp- 
  

   tions 
  at 
  successive 
  states 
  are 
  shown 
  in 
  the 
  following 
  tables. 
  

   "With 
  these 
  results 
  may 
  also 
  be 
  contrasted 
  those 
  obtained 
  for 
  

   the 
  scattered 
  radiation 
  from 
  paper. 
  

  

  Table 
  IX. 
  

   Radiation 
  from 
  Silver 
  (thick). 
  

  

  Thickness 
  of 
  Al 
  placed 
  

  

  in 
  Secondary 
  beam 
  

  

  from 
  Ag. 
  

  

  Percentage 
  diminution 
  

   of 
  Ionization 
  produced 
  by 
  

   Secondary 
  rays 
  by 
  trans- 
  

   mission 
  through 
  Al 
  in 
  

   column 
  1. 
  

  

  Percentage 
  diminution 
  

   of 
  Ionization 
  by 
  Second- 
  

   ary 
  rays 
  due 
  to 
  absorp- 
  

   tion 
  by 
  further 
  sheet 
  of 
  

   Al 
  (-0208 
  cm.)- 
  

  

  

  

  

  

  15-9 
  

  

  •0104 
  cm. 
  

  

  9-2 
  

  

  14-8 
  

  

  •020S 
  „ 
  

  

  16 
  

  

  13-8 
  

  

  •0574 
  „ 
  

  

  37-7 
  

  

  13-1 
  

  

  ■124 
  „ 
  

  

  58 
  

  

  13-5 
  

  

  •182 
  „ 
  

  

  72 
  

  

  14 
  

  

  •263 
  „ 
  

  

  82-5 
  

  

  13-6 
  

  

  •337 
  „ 
  

  

  92 
  

  

  13-8 
  

  

  •526 
  „ 
  

  

  97 
  

  

  14-2 
  

  

  

  

  

  

  16 
  

  

  Table 
  X. 
  

   Radiation 
  from 
  Paper. 
  

  

  Thickness 
  of 
  Al 
  placed 
  

  

  in 
  Secondary 
  beam 
  

  

  from 
  Paper. 
  

  

  Percentage 
  diminution 
  

   of 
  Ionization 
  produced 
  by 
  

   Secondary 
  rays 
  by 
  trans- 
  

   mission 
  through 
  Al 
  in 
  

   column 
  1. 
  

  

  Percentage 
  diminution 
  

   of 
  Ionization 
  by 
  Second- 
  

   ary 
  rays 
  due 
  to 
  absorp- 
  

   tion 
  bv 
  further 
  sheet 
  of 
  

   Al 
  (-0208 
  cm.). 
  

  

  

  

  

  

  28-1 
  

  

  •0104 
  cm. 
  

  

  18-7 
  

  

  20-9 
  

  

  •0208 
  „ 
  

  

  28 
  

  

  17-4 
  

  

  •0574 
  „ 
  

  

  47*5 
  

  

  10-9 
  

  

  •182 
  „ 
  

  

  70 
  

  

  5-8 
  

  

  •584 
  „ 
  

  

  88 
  

  

  2-5 
  

  

  

  

  

  

  27-4 
  

  

  