Definition of "isotopes" []

• Plural form of isotope. (noun)

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• "(Presumably, the need for a license is a matter of degree, given that our own bodies contain radioactive potassium-40, and given that the walls of most buildings contain the radioactive isotopes from the natural uranium-238 and thorium-232 decay chains)."
• "More precise dating based on carbon isotopes is now under way."
• "Small portable lead caskets weighing only 20 to 30 lbs. have been developed, which contain isotopes that emit radiations comparable to a 100,000 volt X-ray machine."