Isotopes of terbium
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| Standard atomic weight Ar°(Tb) | ||||||||||||||||||||||||||||||||||||||
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Naturally occurring terbium (65Tb) is composed of one stable isotope, 159Tb. Thirty-seven radioisotopes have been characterized, with the most stable being 158Tb with a half-life of 180 years, 157Tb with a half-life of 71 years, and 160Tb with a half-life of 72.3 days. All of the remaining radioactive isotopes have half-lives that are less than one week, and the majority of these have half-lives that are less than 24 seconds. This element also has 27 meta states, with the most stable being 156m2Tb (t1/2 = 24.4 hours), 154m2Tb (t1/2 = 22.7 hours) and 154m1Tb (t1/2 = 21.5 hours).
The primary decay mode before the most abundant stable isotope, 159Tb, is electron capture to gadolinium isotopes, and the primary mode after is beta decay to dysprosium isotopes.
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