Potassium 40 in food products
Potassium atoms are present in food. It would be pointless, in order to reduce our body potassium-40 activity, to refrain from eating soybeans or drinking tea ! Our organism needs potassium. Metabolism regulates its assimilation and that of potassium-40. The assimilation of radioactive carbon-14 present in the air, plants and living things is similar. Remembering that a becquerel (Bq) is an extremely small unit, activities of a few hundred becquerels per kilogram pose no real risk.