Rapid Determination of Strontium-90 in Urine

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Abstract
Reverse-phase partition chromatography was adapted for rapid determination of 90Sr in large urine samples. A column is prepared containing the ligand, di(2-ethylhexyl) phosphoric acid which is coated onto the inert support, glass micro beads. The 90y daughter of 90Sr is selectively absorbed by the column and subsequently eluted. The 90y is precipitated as the oxalate, beta counted, and the sample activity level obtained by computer data reduction. The chemical recoveries are better than 80%, precision of analysis is better than 5% and no overall bias is observed. The procedure is rapid, large sample sizes can be used for good sensitivity, and decontamination factors are satisfactory.

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