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2 definitions found
 for ionizing radiation
From The Collaborative International Dictionary of English v.0.48 :

  ionizing radiation \ionizing radiation\ n.
     rays of rapidly moving subatomic particles, x-reys, or gamma
     rays, sufficiently energetic to cause ionization when
     absorbed by matter.
     Note: Such radiation is emitted by radioactive elements, or
           may be generated by highly energetic physical
           processes, as in stars. When absorbed by living tissue,
           ionizing radiation can cause mutation, cellular damage,
           or death.

From WordNet (r) 3.0 (2006) :

  ionizing radiation
      n 1: high-energy radiation capable of producing ionization in
           substances through which it passes

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