338 



Table 398. 

 RADIOACTIVITY. 



P= 1/2 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 

 V3 = aR where R = range and assuming the velocity for RaC of range 7.06 cm. at 20° is 

 2.06 X 10^ cm. per sec, i.e. v = i.077r V3. 



Smithsonian Tables. 



