Abstract
A simple method has been developed for estimating Ru-106 in urine. Urine samples spiked with 3–50 Bq of Ru-106 and 200 μg of ruthenium carrier were initially oxidized using an HNO 3-H 2O 2 mixture. Attempts to recover ruthenium by various preconcentration methods after the initial oxidation resulted in recoveries ranging from 10–54% depending on the experimental conditions. For near quantitative recoveries, the organic matter in urine was completely destroyed by wet ashing with HNO 3-H 2O 2 (method A) or HNO 3-H 2O 2 followed by H 2SO 4 treatment (method B). The ruthenium was oxidized to RuO 4 using potassium periodate and allowed to react in situ with polyethylene powder. The polyethylene powder was separated, washed and its beta activity was counted. The recovery of ruthenium was 86.9 ± 4.6% (RSD 5.3%) in method A; and 94.4 ± 2.6% (RSD 2.8%) in method B. The minimum detection limit achieved was 0.59 Bq/dm 3. Interferences due to Cs-137 and Sr-90 were studied.
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