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radioactivity
radiobiology
radiobroadcasting
radiocarbon
radiocarbon dating
radiochemistry
radioelement
radiogenic
radiogram
radiograph
radioimmunoassay
radioiodine
radioisotope
radiolabel
radiolarian
radiolocation
radiology
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radiopaque
ra·di·o·paque [ ràydee ō páyk ]


adjective 
Definition:
 
not penetrable by electromagnetic radiation: blocking the passage of X-rays and other forms of electromagnetic radiation

ra·di·o·pac·i·ty [ ràydee ō pássətee ] noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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