Dose effect for South Serbians due to 238U in natural drinking water
RADIATION PROTECTION DOSIMETRY(2007)
摘要
The use of depleted uranium ammunition in South Serbia during the 1999 Kosovo conflict raised a great deal of public concern in the Balkans. Radioactivity levels of U-238 in 20 wells and lake water samples were checked from the viewpoint of internal radiation exposure for South Serbian subjects. We have measured U-238 concentration using inductively coupled plasma mass spectrometry, whereas thermal ionisation mass spectrometry has been used for the measurement of isotope ratios, e.g. U-234/U-238 and U-235/U-238. The concentration of uranium in water samples varies in the range 1.37-63.18 mBq/L. U-234 belongs to the U-238 natural radioactive decay series, and at secular equilibrium, the abundance ratio, U-234/U-238, corresponds to the ratio of their half-lives. The U-234/U-238 activity ratio varies in the range 0.88-2.2 and U-235/U-238 isotope ratio varies from 0.00698 to 0.00745. These findings indicate that uranium in water was a mixture of natural and anthropogenic origin. The annual effective dose due to U-238 was estimated to be in the range 9.2 X 10(-5)-2.1 X 10(-3) mSv.
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