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Medical Term:

cosmic rays

 

Definition: high-velocity particles of enormous energies, bombarding earth from outer space; the “primary radiation” consists of protons and more complex atomic nuclei that, on striking the atmosphere, give rise to neutrons, mesons, and other less energetic “secondary radiation.”

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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