nuclear radiation

noun
Physics. radiation in the form of elementary particles emitted by an atomic nucleus, as alpha rays or gamma rays, produced by decay of radioactive substances or by nuclear fission.
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Alternatively, there is the beginning to explore the possibility to produce
  fusion energy without any nuclear radiation hazards.
Finally there is now convincing evidence that nuclear radiation is not nearly
  as dangerous as was thought.
There are more people getting struck by lightning than dying of nuclear
  radiation.
The whole world knew that nuclear radiation was dangerous.
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