The energy emitted in the form of energy or particles from radioactive atoms is defined as radiation.
Radiation is energy, whereas radioactive contamination is a material.
Analogy:
radiation is like heat from a fire
contamination is like the ash and embers from the fire
airborne contamination is like smoke from the fire
Like heat from a fire, radiation can be intense, but when you leave the area, you leave the hazard behind. Like the ash, contamination can be carried out of the area with you.
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