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Fractional absorption of ingested uranium in humans
1Health Sciences Research Division, Oak Ridge National Laboratory, TN 37831-6480.
Health Physics
|April 1, 1995
Summary
Gastrointestinal uptake of uranium in adults averages 1-1.5%. Further research is needed to understand uranium absorption in children and its relation to intake levels and food sources.
Area of Science:
- Environmental Science
- Toxicology
- Human Health
Background:
- Uranium exposure is a concern due to its potential toxicity.
- Understanding gastrointestinal (GI) uranium uptake is crucial for human health risk assessment.
Purpose of the Study:
- To review and reanalyze existing data on GI uranium uptake in humans.
- To estimate average GI uranium uptake in adult populations.
Main Methods:
- Analysis of data from controlled experimental studies with short-term oral uranium intake.
- Review of balance studies conducted in a metabolic research ward.
- Examination of environmental studies correlating urinary uranium with total intake/excretion.
Main Results:
- Controlled studies showed individual GI uptake ranging from <0.1% to 6%, with central estimates of 1-2.4%.
- Environmental studies yielded central estimates of 0.3-3.2% for GI uranium uptake.
- Average GI uranium uptake in adults is estimated at approximately 1-1.5% of total intake.
Conclusions:
- Uranium GI uptake in adults is relatively low, averaging 1-1.5%.
- More data is required for children and to determine uptake variations with intake levels and food sources.
- Chemical form and fasting status significantly influence uranium uptake in animal models.