Uranium and thorium in urine of United States residents: reference range concentrations.

@article{Ting1999UraniumAT,
  title={Uranium and thorium in urine of United States residents: reference range concentrations.},
  author={B G Ting and Daniel C. Paschal and Jim Jarrett and James L. Pirkle and Rachel J Jackson and Eric J. Sampson and Dr. Thomas A. Miller and Samuel P. Caudill},
  journal={Environmental research},
  year={1999},
  volume={81 1},
  pages={45-51}
}
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… CONTINUE READING