2. Radon isotopes
When the Earth was formed some 5 billion years ago, matter comprised both stable and unstable atoms. Since then, however, the majority of unstable atoms have decayed into stable nuclides through radioactivity. However, there are still a few families of naturally occurring radionuclides.
2.1 Notions of natural radioactivity
Natural radioactivity is made up of three main categories of radioactive elements:
radionuclides produced by nuclear reaction in the upper atmosphere under the action of cosmic rays: carbon-14 ( 14 C), tritium ( 3 H), beryllium-10 ( 10 Be), etc. These elements diffuse into...
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Radon isotopes
Physical phenomena of radon in soils
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