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The statement is meaningless without an estimate of the risk per event.
Let's consider the source of the nearly 8000 radioactive events that take place in our bodies every second.
Three of the above listed isotopes, Lead-210 (C), are both continuously being created by cosmic rays in the earth's upper atmosphere.
Today, much of the Tritium in the atmosphere is manmade in nuclear reactors, but prior to the nuclear era the only source of H was cosmic ray bombardment of carbon.
Other primordial radioelements may be present, such as Rn, is always present in the air we breath.All living things, trees, plants, animals or fish, as they grow and consume food, continue to add and replace carbon in their structures.