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May20-04, 06:00 AM
Sorry, slightly unclear terminology, by dose, I meant dose of radiation from any source, not just Uranium. We get doses from a variety of sources naturally. Dose is measured in energy absorbed per mass (1 J/kg = 1 Gray = 100 rad), and on average per year, we recieve about 360 millirad (3.6 mGy)* from sources such as radon, diagnostic x-rays, cosmic rays, and food as well (Bananas, for example are high in Potassium (K). And 0.017 per cent of K is K-40, and is radioactive with a half life of 1.27 billion years, so if you have a banana, you have K-40.).
Terrestrial living things tend to have C-14 in them, which is radioactive. So just being around people will give you a dose.