REGIONS OF MAXIMUM IONIZATION. 



45 



cm. 



20 







10 



2.0 



30 40 



-loo cm. 



FIG. 13. lonization at different points along the axis of the fog chamber for 

 different positions of the sealed radium tubelets within the aluminum core. 

 Position of lines of sight shown on the curves. 



20 







1Q 



w 



30 



40 



loocrii. 



FIG. 14. lonization at different points along the axis of the fog chamber for 

 different positions of the sealed radium tubelets within the aluminum core. 

 Position of lines of sight shown on the curves. 



