- a radioactive isotope, usually artificially produced: used in physical and biological research, therapeutics, etc.
Origin of radioisotope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- an isotope that is radioactive
Word Origin and History for radioisotope
Online Etymology Dictionary, © 2010 Douglas Harper
- A naturally or artificially produced radioactive isotope.
- A radioactive isotope of a chemical element. Carbon 14 and radon 222 are examples of naturally occurring radioactive isotopes.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.