ionizing radiation

noun Physics.
any radiation, as a stream of alpha particles or x-rays, that produces ionization as it passes through a medium.

Origin:
1900–05

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Collins
World English Dictionary
ionizing radiation
 
n
electromagnetic or corpuscular radiation that is able to cause ionization

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ionizing radiation n.
High-energy radiation capable of producing ionization in substances through which it passes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Alcohol followed on his short list only after ionizing radiation and hormone
  therapy.
He asked if he could wait somewhere else, since he was exposed there to too
  much ionizing radiation for comfort.
When ionizing radiation strikes a tumor, it generates reactive chemicals called
  free radicals that damage tumor cells.
Microwaves are not ionizing radiation and cannot possibly cause cancer.
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