80 



ADVENTURES IX RADIOISOTOPE RESEARCH 



determined quantitatively but that at —0.24 V (compared with the 

 calomel electrode) there occurs a sudden increase in the amount de- 

 posited. If bismuth nitrate is now added to the solution until the 

 Bi + RaE normality of 10"^ is reached the characteristic increase takes 

 place at —0.14 V i.e., about 100 mV lower (see Fig. 2). According to 

 Nernst's theory it can be expected that a change in concentration of 



90 

 80 

 70 

 60 



so 



40 

 30 

 20 



10 



*0-6 +05 *0-^ 



*6-3 *o-2 *o-i "-^^y *tT -k 'O-^ -OS -o-eyoff- 



Fig. 1. Cathodie deposition of radium-E. Concentration of the 

 solution about 10"-»N in I^aE 



iOOir- 



90- 

 80 

 70 

 60 

 JO 

 40- 

 30 

 20 

 10 

 



*06 *0S *0^ *0-3 *0-2 *0-1 



-01 -02 -0-3 -04 -OS -(HVoit 



Fig. 2. Cathodie deposition of radium-E. Concentration of the 

 solution 10" *N in bismuth isotopes, Bi -f RaE. 



