A study of 222Rn emanation in electrodeposited sources of 226Ra with barium

A study of 222Rn emanation in electrodeposited 226Ra sources was performed. The loss of radon by emanation from the electrodeposited sources was observed by measuring the 222Rn/226Ra activity ratio at various times after the start of source preparation, and a quantification of this phenomenon was developed assuming a radon diffusion term in the ingrowth equations. The effect of the barium contained in the electrolyte solution on the radon emanation was also studied. The resulting 222Rn diffusion factor was observed to depend on the amount of barium added to the electrolyte and ranged between 0.091 and 0.178 days−1.