﻿due 
  to 
  the 
  j 
  Rays 
  of 
  Radium 
  C. 
  

  

  Table 
  VI. 
  (See 
  fig. 
  3.) 
  

  

  Radium 
  in 
  lead. 
  

   Lead 
  screens. 
  

  

  231 
  

  

  Thickness 
  of 
  

   screens 
  in 
  rams. 
  

  

  Lead, 
  5 
  cms. 
  

  

  Iron, 
  5 
  cms. 
  

  

  Brick, 
  6 
  cms. 
  i 
  

  

  

  

  12-7 
  

   1-76 
  

  

  •69 
  

   •31 
  

   •19 
  

  

  8-4 
  

   3-63 
  

   2-25 
  

   1-03 
  

   •53 
  

  

  5-6 
  

  

  2-6L 
  

  

  1-45 
  

  

  •78 
  

   •38 
  

  

  0-15 
  

  

  075 
  

  

  2-00 
  

  

  400 
  

  

  

  Fijr. 
  3. 
  

  

  14 
  

   12 
  

   10 
  

  

  l" 
  

  

  6 
  

   2 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  l+mg 
  Ra 
  Br 
  z 
  in 
  Lead 
  

   icm. 
  

  

  

  1 
  

  

  

  

  

  Lead 
  Screens 
  

  

  

  V 
  

  

  ■>., 
  

  

  

  

  

  

  

  

  v: 
  

  

  -~— 
  • 
  — 
  

  

  _Lead_ 
  

  

  

  

  

  

  ; 
  

  

  

  

  Table 
  VII. 
  (See 
  fig. 
  4.) 
  

  

  Eadium 
  in 
  steel 
  2'2 
  cms. 
  thickness. 
  

   Lead 
  screens. 
  

  

  Thickness 
  of 
  

   screens 
  in 
  mms. 
  

  

  Lead, 
  5 
  cms. 
  

  

  Iron, 
  5 
  cms. 
  

  

  Brick, 
  6 
  cms. 
  

  

  

  

  19-2 
  

  

  1-7 
  

   11 
  

  

  •80 
  

   •34 
  

   •30 
  

  

  95 
  

   50 
  

   4-4 
  

   31 
  

   1-42 
  

   •57 
  

  

  7-5 
  

   4-9 
  

   37 
  

   2-52 
  

   10G 
  

   •43 
  

  

  0-15 
  

  

  0-30 
  

  

  075 
  

  

  2-00 
  

  

  400 
  

  

  

  