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- aggregation classification "A1".
- aggregation creator B42274.
- aggregation creator B42275.
- aggregation creator B42276.
- aggregation creator B42277.
- aggregation creator B42278.
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- aggregation creator B42281.
- aggregation creator person.
- aggregation creator person.
- aggregation creator person.
- aggregation date "1998".
- aggregation hasFormat 176695.bibtex.
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- aggregation isPartOf urn:issn:0017-9078.
- aggregation language "eng".
- aggregation subject "Biology and Life Sciences".
- aggregation title "Uptake of ingested uranium after low 'acute intake'".
- aggregation abstract "The uptake of uranium, ingested as a soluble compound, was studied by monitoring the uranium level in urine by inductively coupled plasma mass spectrometry and through measurement of an isotopic tracer. The high sensitivity of this method allows measurement of uranium levels in urine samples from each voiding, therefore more detailed biokinetic studies are possible. To simulate low ((acute intake," five volunteers with "normal" levels (5-15 ng L-1) of uranium in urine ingested a grapefruit drink spiked with 100 mu g of uranium (U-235/U-238 = 0.245%) as uranyl nitrate, and the level of uranium in their urine after ingestion was monitored. Two techniques were applied to estimate the extent of exposure: a) uranium levels above the normal level for each volunteer; and b) the deviation from natural isotopic ratio. Results were normalized relative to the creatinine concentration, which served as an indicator of urine dilution, to reduce effects due to diurnal changes. The results clearly indicate that currently accepted bio-kinetic models overestimate the time between ingestion of dissolved uranium and its excretion in urine, the maximum of which was found to be around 6-10 h. The uptake fraction was in agreement with recent studies, i.e., 0.1-0.5% of the ingested uranium for four of the subjects but above 1.5% for the fifth, and well below the 5% reported in International Commission on Radiation Protection Publication 54. Finally, partial results from the isotope dilution study indicate that uranium absorbed through the intestine interchanges with uranium retained in body organs. The time scale of this process is quite short, and the acute exposure led to a minimum in the isotopic ratio within hours, while recovery back to natural abundance due to low chronic exposure takes several days.".
- aggregation authorList BK106393.
- aggregation endPage "345".
- aggregation issue "3".
- aggregation startPage "337".
- aggregation volume "74".
- aggregation isDescribedBy 176695.
- aggregation similarTo 00004032-199803000-00006.
- aggregation similarTo LU-176695.