﻿Homogeneous 
  Secondary 
  Rontgen 
  Radiations. 
  567 
  

  

  a 
  thin 
  film 
  of 
  air 
  would 
  produce 
  equal 
  ionizations 
  in 
  that 
  

   air, 
  be 
  sent 
  through 
  a 
  thin 
  sheet 
  of 
  copper, 
  the 
  intensity 
  of 
  

  

  100 
  

  

  sc 
  

  

  8C 
  

  

  70 
  

  

  <fe 
  €0 
  

  

  5C 
  

  

  4C 
  

  

  t; 
  30 
  

  

  

  

  

  

  

  

  

  • 
  

  

  

  

  

  

  1 
  

  

  

  

  1/ 
  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  20 
  

  

  30 
  40 
  50 
  • 
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  70 
  80 
  

  

  /OrV/ZST/OA/ 
  BY 
  Pft/MAffY 
  fiE/!M. 
  //V 
  /?/#. 
  

  

  100 
  

  

  secondary 
  radiation 
  produced 
  on 
  that 
  sheet 
  by 
  one 
  beam 
  will 
  

   equal 
  that 
  produced 
  by 
  the 
  other, 
  even 
  though 
  one 
  is 
  three 
  

   or 
  four 
  times 
  as 
  penetrating 
  to 
  copper 
  as 
  the 
  other 
  one. 
  As 
  

   for 
  such 
  ranges 
  of 
  penetrating 
  power 
  as 
  are 
  possessed 
  by 
  the 
  

   constituents 
  of 
  such 
  a 
  primary 
  beam, 
  the 
  relative 
  ionizations 
  

   produced 
  by 
  those 
  constituents 
  in 
  different 
  substances 
  are 
  

   usually 
  fairly 
  constant, 
  it 
  is 
  highly 
  probable 
  that 
  the 
  intensity 
  

   of 
  the 
  homogeneous 
  rays 
  from 
  copper 
  is 
  through 
  wide 
  ranges 
  

   of 
  penetrating 
  power 
  of 
  the 
  primary 
  proportional 
  to 
  the 
  ioni- 
  

   zation 
  which 
  takes 
  place 
  in 
  the 
  copper, 
  and 
  is 
  independent 
  of 
  

   the 
  character 
  of 
  the 
  primary 
  producing 
  it. 
  

  

  It 
  does 
  not 
  necessarily 
  follow 
  from 
  this 
  that 
  the 
  process 
  of 
  

   ionization 
  produces 
  the 
  radiation, 
  but 
  it 
  seems 
  to 
  indicate 
  

   that 
  the 
  energy 
  of 
  the 
  homogeneous 
  secondary 
  radiation 
  is, 
  

   for 
  such 
  ranges 
  in 
  penetrating 
  power, 
  proportional 
  to 
  the 
  

   energy 
  of 
  the 
  primary 
  beam 
  spent 
  in 
  the 
  process 
  of 
  ionization. 
  

  

  When 
  the 
  primary 
  radiation 
  was 
  transmitted 
  through 
  

  

  