radioactive isotopes

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ra·di·o·ac·tive i·so·topes

(rā'dē-ō-ak'tiv ī'sŏ-tōps)
Isotopes with an unstable nuclear composition; such nuclei decompose spontaneously by emission of a nuclear electron (β particle) or helium nucleus (α particle) and radiation (γ rays), thus achieving a stable nuclear composition; used as tracers, and as radiation and energy sources.
See also: half-life
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ra·di·o·ac·tive i·so·topes

(rā'dē-ō-ak'tiv ī'sŏ-tōps)
An isotope with an unstable nuclear composition; used as tracers, and as radiation and energy sources.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Subject A (male, 97) was fully compliant; subject B (male, 21) said he'd showered on Sunday and it was too early for another bath; subject C (male, 24) said: "What do you mean, radioactive isotopes? I'm not getting into a bath with that in it"; and subject D (female, age withheld) said: "Don't be silly," and walked off shaking her head.
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