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Drinking-water contribution to natural background radiation
Health Physics
|January 1, 1986
Summary
Drinking water contains naturally occurring radionuclides, contributing minimally to annual effective dose equivalent (0.002-0.05 mSv/y). Radon-222 (222Rn) from water poses a slightly higher inhalation risk.
Area of Science:
- Environmental Science
- Radiological Health
- Public Health
Background:
- Naturally occurring radionuclides are present in drinking water sources.
- Estimating radiation dose from ingested radionuclides is crucial for public health risk assessment.
Purpose of the Study:
- To estimate the annual effective dose equivalent from radionuclides in U.S. drinking water.
- To assess the contribution of drinking water to overall radiation exposure.
Main Methods:
- Utilized recent measurements of radionuclide concentrations in drinking water.
- Applied dosimetric models from ICRP Publication 30 and BEIR III risk coefficients.
- Analyzed cohort data and U.S. Environmental Protection Agency risk factors.
Main Results:
- Community water supplies contribute 0.002-0.05 mSv/y to annual effective dose equivalent.
- Radon-222 (222Rn) dissolved in water contributes 0.8-30 μSv/y via inhalation after release.
Conclusions:
- Drinking water contributes a small but quantifiable dose of radiation.
- Radon-222 represents a notable exposure pathway from drinking water, primarily through inhalation.