338 



TABLE 398. 

 RADIOACTIVITY, 



P = i /2 period = time when body is one-half transformed. A = transformation constant (see 

 previous page). The initial velocity of the a particle is deduced from the formula of Geiger 

 V 8 = aR where R = range and assuming the velocity for RaC of range 7.06 cm. at 20 is 

 2.06 X io 9 cm. per sec., i.e. v = i.ojjr l / 3 . 



SMITHSONIAN TABLES. 



