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  Absorption 
  of 
  the 
  7 
  Rays 
  of 
  Radium. 
  

   Table 
  II. 
  

   Anode 
  of 
  scattering 
  110°. 
  

  

  615 
  

  

  1 
  

   (a) 
  Intensity 
  of 
  primary 
  rays, 
  100. 
  Lead 
  L 
  2 
  , 
  0-0 
  mm. 
  thick. 
  

  

  Intensity 
  of 
  scattered 
  rays. 
  

  

  Thickness 
  of 
  lead 
  M. 
  

  

  Carbon. 
  

  

  Iron. 
  

  

  Lead. 
  

  

  00 
  

  

  4 
  37 
  

   1-35 
  

   0-37 
  

  

  3-67 
  

   1-34 
  

   038 
  

  

  0-57 
  

   0-36 
  

  

  l'O 
  mm 
  

  

  3-0 
  mm 
  

  

  

  (b) 
  Intensity 
  of 
  primary 
  rays, 
  60. 
  Lead 
  L 
  3 
  , 
  0'74 
  cm. 
  thick. 
  

   Intensity 
  of 
  scattered 
  rays. 
  

  

  Thickness 
  of 
  lead 
  M. 
  Carbon. 
  

  

  Iron. 
  

  

  Lead. 
  

  

  o-o 
  

  

  1-94 
  

  

  1-85 
  

   0-70 
  

   0-23 
  

  

  0-31 
  

  

  

  074 
  

   0-23 
  

  

  3-0 
  mm 
  

  

  

  (c) 
  Intensity 
  of 
  primary 
  rays, 
  32-5. 
  Lead 
  L 
  3 
  , 
  1*84 
  cm. 
  thick. 
  

   Intensity 
  of 
  scattered 
  rays. 
  

  

  Thickness 
  of 
  lead 
  M. 
  

  

  Carbon. 
  

  

  Iron. 
  

  

  o-o 
  

  

  1-05 
  

   0-47 
  

  

  1-00 
  

   0-47 
  

  

  

  

  (d) 
  Intensity 
  of 
  primary 
  rays, 
  19-0. 
  Lead 
  L 
  3 
  , 
  2*94 
  cm. 
  thick. 
  

   Intensity 
  of 
  scattered 
  rays. 
  

  

  Thickness 
  of 
  lead 
  M. 
  

  

  Carbon. 
  

  

  Iron. 
  

  

  

  00 
  

  

  0-56 
  

  

  0-54 
  

  

  

  

  obtained 
  from 
  Table 
  I. 
  It 
  is 
  evident, 
  therefore, 
  that 
  some 
  

   change 
  must 
  take 
  place 
  in 
  the 
  quality 
  o£ 
  the 
  7 
  rays 
  when 
  

   they 
  penetrate 
  matter, 
  either 
  direct 
  or 
  by 
  scattering. 
  The 
  

   possible 
  production 
  of 
  characteristic 
  radiations 
  is 
  not 
  con- 
  

   sidered, 
  as 
  the 
  quality 
  of 
  the 
  secondary 
  rays 
  is 
  very 
  nearly 
  

  

  2T 
  2 
  

  

  