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All living cells take up carbon-14, whether from photosynthesis or eating other living cells.
Gamma rays have the most energy and can penetrate substances up to a few centimetres of lead or a few metres of concrete.
Even with such intense barriers, some radiation may still get through because of how small the rays are.
Though the least ionising of all the forms of radiation, that doesn't mean Gamma rays aren't dangerous.
Alpha particles are most commonly used in smoke alarms.
These alarms contain a tiny amount of decaying Americium between two sheets of metal. A small electric current is then passed through one of the sheets and into the second one.