Radioactive waters

The Severn Estuary is contaminated with five times the normal background levels of radioactive carbon-14, say Scottish researchers. The isotope, which has a half-life of 5730 years and is easily incorporated into the food chain, was discharged by a medical isotope production plant run by Amersham International in Cardiff. In the latest Journal of Environmental Radioactivity (vol 40, p 89),
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