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radio telescope
radio wave
radioactive
radioactive dating
radioactive decay
radioactive series
radioactive tracer
radioactive waste
radioactivity
radiobiology
radiobroadcasting
radiocarbon
radiocarbon dating
radiochemistry
radioelement
radiogenic
radiogram
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radioactivity
ra·di·o·ac·tiv·i·ty [ ràydee ō ak tívvətee ]


noun 
Definition:
 
1. radioactive nature: the radioactive nature of a substance such as uranium or plutonium
2. radiation: the high-energy particles emitted by radioactive substances
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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