potassium-40

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potassium-40

[pə′tas·ē·əm ¦fȯr·dē]
(nuclear physics)
A radioactive isotope of potassium having a mass number of 40, a half-life of approximately 1.31 × 109 years, and an atomic abundance of 0.000122 gram per gram of potassium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The giant impact model also provides a good explanation for the unexplained differences in isotopes of potassium, phosphorus and rare-earth elements like tungsten-182 between the surfaces of the Earth and Moon, the researchers explain.