The neutron radiation can turn stable elements in your body to
radioactive isotopes (called neutron activation). This makes you
radioactive in a way that cannot be removed by any attempt at
decontamination. No other type of radiation can do this.
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No, not all radiation is electromagnetic radiation, though some
is.
Exceptions:
Neutron radiation - Emission of neutrons.
Alpha decay - Emission of a helium-4 nucleus (2 protons and 2
neutrons).