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Radioactivity in the Earth leads to
all of the above (energy for volcanoes, helium for toy balloons, heat for geysers)
If the half-life of an element is big, that means that
it decays slower then one with a small half life
Muller wears a wrist watch with tritium in the watch hands because
the levels of radiation that emerge are safe
Most of the elements found on the Earth were created
in the first few millions years of the Earths existence
After four half-lives, the surviving tritium atoms are removed. Compared to completely new tritium atom, they are expected to live
exactly as long
Dirty bombs may be less of a threat than people fear, because
dirty bombs require plutonium, and that is hard for terrorists to obtain
Uranium is found on the Earth, even though it is radioactive. Thats because
it has a very long half-life
The natural radioactivity (rate of nuclear decays) in a typical human body is closest to
4000 per second
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