GENERATION AND DECAY. 



73 



torrent, and that the issuing rays are akin to the gamma rays of radium 

 and quite distinct from the undulatory phenomenon of X-radiation. 

 In fact, each part of the medium within the radius of 6 meters behaves 

 as if it were the source of such rays. 



8C 



WO m l\ soo 500 



ftn 



w cadt. on wood 



9)=2,00om fp=^5oirv 



FIGS. 69-78. Illustrating tables 43, 44, 45, 49, 50, 53, 54. 



58. Generation and decay for radiation from D=200 cm. Before 

 proceeding with the investigation it will be advisable to examine the 

 generation and decay of nuclei when the radiation comes from long 

 distances. The data of table 45 are of the kind to be anticipated from 

 the results of section 17. The experiments were made at the fog 

 limit of dust-free air. The first part of the table shows that exposures 



