420 



V. M. Zaporozhetz and E. M. Filippov 



where: E is the energy of an electron; 



R is the penetration path of the electron in a substance. 



Table 7. Penetration of electrons with different energy in substances 

 OF different densities (cm) 



Table 8. 



The energy used by an electron (with E^ energy) to produce 

 reaction radiation over an interval R cm (MeV). 



Table 9. The energy Ey, used by an electron (with E^ energy to produce 

 reaction radiation over an interval 7-<;i? (MeV) 



The penetration paths of electrons and the energy used by electrons over 

 different path -intervals in the rock, as calculated in terms of these formu- 

 lae, are shown in the Tables 7-9. 



These tables show the following: 



(a) The increase in the density of the rock leads to the diminution in the 

 penetration path of an electron in it. 



(b) The increase in the electron energy leads to the increase of its penetra- 

 tion path in rocks. 



(c) The increase in the density of a rock and of its effective atomic number 

 leads to the generation of a harder reaction radiation. 



The reaction radiation, produced in the irradiated medium has its beam 

 near to the direction of the electron beam. At the same time the higher the 



