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how the radiation happens?
The 'radiation' of heat is the process of excited particles colliding with each other to give the sensation of heat.
Radiation in the particle sense is the process of a heavy atom (iron or heavier) being too unstable to support its own mass, and therefore it splits itself in to 2 or more smaller atoms. Depending on the size and energy of the particle emitted, radiation can be Alpha (stopped by paper, and not dangerous unless ingested), Beta (can penetrate skin but not bone, dangerous to be near), or Gamma (highly ionising, however can pass through the body).


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