radioisotopes
Synonyms
Examples
All of the elements have some isotopes that are radioactive ( radioisotopes ), although not all of these radioisotopes occur naturally.
All other radioisotopes have ground-state half lives not greater than 1.117 days, and most have half lives under 3 hours.
All the remaining radioisotopes have half-lives that are less than 2 days, and the majority of these have half-lives that are less than 48 seconds.
At least 23 radioisotopes are known.
DGNAA is applicable to the vast majority of elements that form artificial radioisotopes.
Eighteen radioisotopes have been isolated and described, the most stable being 53 Mn with a half-life of 3.7 million years, 54 Mn with a half-life of 312.3 days, and 52 Mn with a half-life of 5.591 days.