Determination of low concentration Pu by liquid scintillation and powdered solid scintillation counting method in spent fuel reprocessing solution

not registered; not registered ; Kurosawa, A.; Ikeda, Hisashi

Application of liquid and powdered solid scintillation alpha-counting method were studied for measurement of low concentration Pu in spent fuel reprocessing plant solution. Principle of those methods is count photons from mixture of scintillator and sample solution. Advantage of those methods is unnecessary of heating by high temperature, which is estimated to be main cause of analytical error and a fire, as the conventional ZnS(Ag) scintillation counting. Since liquid and solid scintillator are treated as a burnable waste, this method is effective concerning of reduction of wastes as well. Liquid scintillation method, whose sample volume is 0.5mL, is confirmed effectiveness for determination of Pu concentration in aqueous sample. Powdered solid scintillation method is applicable both aqueous and organic solutions. It is confirmed that this method is adopted in analysis of reprocessing solution instead of the conventional method. Pu concentration in actual reprocessing sample, 97-1 campaign, were measured by solid scintillation method. Results were agreed with those measured by the conventional method under the good precision. It is achieved sample, accurate and safety analytical procedure by applying powdered solid scintillation method.