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radioprotective
radioresistant
radioscopy
radiosensitive
radiosonde
radiostrontium
radiotelephone
radioteletype
radiotherapy
radiothorium
radiotoxic
radiotracer
radish
radium
radium therapy
radius
radius of action
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radiometric dating
ra·di·o·met·ric dat·ing


noun 
Definition:
 
determining age using radioactive decay rates: a method of determining the age of objects or material using the decay rates of radioactive components such as potassium-argon
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