Author/Authors :
Bill G. Ting، نويسنده , , Daniel C. Paschal، نويسنده , , Jeffery M. Jarrett، نويسنده , , James L. Pirkle، نويسنده , , Richard J. Jackson، نويسنده , , Eric J.Sampson، نويسنده , , Dayton T. Miller، نويسنده , , Samuel P. Caudill، نويسنده ,
Abstract :
We measured uranium and thorium in urine of 500 U. S. residents to establish reference range concentrations using a magnetic-sector inductively coupled argon plasma mass spectrometer (ICP-MS). We found uranium at detectable concentrations in 96.6% of the urine specimens and thorium in 39.6% of the specimens. The 95th percentile concenetration for uranium was 34.5 ng/L (parts per trillion); concentrations ranged up to 4080 ng/L. Thorium had a 95th percentile concentration of 3.09 ng/L; concentrations ranged up to 7.7 ng/L.
Keywords :
Metals , urine , uranium , radio-nuclide. , thorium
