[Determining thorium level in urine with its preliminary chromatographic extraction].

The contributors propose a radiometric technique of detecting thorium in urine. The technique is based on a prior concentrating of the nuclide on phosphate residues, with its further separation in extraction-chromatographic vessel filled with diethylhexylphosphorus acid, and reextraction with oxalic acid. Measurements were made in the hard scintillator layer at 90 percent effectiveness. Thorium chemical output was at 85 +/- 3 percent, sensitivity at 5 mBk for a sample. If the sample contained an equal quantity of uranium, the percentage of cleaning thorium from uranium was 100. The proposed technique is economical, simple to perform, and is designed for natural thorium content measurements in human organism.