Removal efficiencies (%) for I and ¹²⁵I ions.

Removal efficiency (%) = (1−[A]/[B])×100 according to [38]. [A], [B]: concentrations of I and 125I solutions after and before filtration. Each solution was filtered only, without electrolysis. *: [A] values used to calculate removal efficiency were below the detection limit. #: equivalent ppb values calculated from the radioactivities loaded. Values within parentheses were prepared and loaded amounts or radioactivities of iodine.