METHOD FOR PRODUCING LOW Α-EMITTING BISMUTH AND LOW Α-EMITTING BISMUTH

摘要

Provided is a low α-emitting bismuth, characterized in that the α ray emission rate is 0.003 cph/cm2 or less. Provided is a method for producing a low α-emitting bismuth, characterized in that bismuth having an α ray emission rate of 0.5 cph/cm2 or less is used as the starting material; the starting bismuth is dissolved in a nitric acid solution by electrolysis to produce a bismuth nitrate solution having a bismuth concentration of 5 to 50 g/L and pH of 0.0 to 0.4; the solution is passed through a column packed with an ion-exchange resin and the polonium in the solution is removed by exchange with the ion-exchange resin; and the liquid after being passed through the ion-exchange resin is subjected to electrowinning and the bismuth is recovered.