Chemical Pretreatment Precedure Optimization for Analysis of Trace Plutonium in Urine

Analysis of plutonium in urine is the primary method to calculate the irradiation dose of plutonium handlers. The chemical pre-treatment precedure for analysis of trace level plutonium in urine were inveitigated. The optimized conditions were follows as: acidity of 7-8 mol/mL, adsorption rate of 0.5-0.8 mL/min, desorption rate of 0.2-0.3 mL/min, desorption solution of 10 mL, pulse plating current of 0.5 A, current frequency of 2 000 Hz, duty ratio of 1∶2 and plating time of 2 h. The whole recovery of 66.0% for ²³⁸Pu of 4.23×10^-3 Bq could be achieved with much less analysis time and 10%-15% higher recovery than the ordinary precedure.