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  • Title: Determination of natural and depleted uranium in urine at the ppt level: an interlaboratory analytical exercise.
    Author: Ough EA, Lewis BJ, Andrews WS, Bennett LG, Hancock RG, D'Agastino PA.
    Journal: Health Phys; 2006 May; 90(5):494-9. PubMed ID: 16607181.
    Abstract:
    An analytical exercise was initiated in order to determine those procedures with the capability to measure total uranium and uranium (238U/235U) isotopic ratios in urine samples containing >0.02 microg U kg-1 urine. A host laboratory prepared six identical sets of twelve synthetic urine samples containing total uranium in the range of 25 to 770 ng U kg-1 urine and with 238U/235U isotopic ratios ranging from 138 (100% NU) to 215 (51% DU). Sets of samples were shipped to five testing laboratories (four based in Canada and one based in Europe). Each laboratory utilized one of the following analytical techniques: sector field inductively coupled plasma mass spectrometry (ICP-SF-MS), quadrupole inductively coupled plasma mass spectrometry (ICP-Q-MS), thermal ionization mass spectrometry (TIMS), and instrumental/delayed neutron activation analysis (I/DNAA), in their analyses.
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