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Thulium-166

Main isotopes of thulium
Iso­tope Decay
abun­dance half-life mode energy (MeV) pro­duct
167Tm syn 9.25 d ε 0.748 167Er
168Tm syn 93.1 d ε 1.679 168Er
169Tm 100% is stable with 100 neutrons
170Tm syn 128.6 d β 0.968 170Yb
171Tm syn 1.92 y β 0.096 171Yb
Standard atomic weight (Ar)
  • 168.93422(2)

Naturally occurring thulium (69Tm) is composed of 1 stable isotope, 169Tm (100% natural abundance). Thirty-four radioisotopes have been characterized, with the most stable being 171Tm with a half-life of 1.92 years, 170Tm with a half-life of 128.6 days, 168Tm with a half-life of 93.1 days, and 167Tm with a half-life of 9.25 days. All of the remaining radioactive isotopes have half-lives that are less than 64 hours, and the majority of these have half-lives that are less than 2 minutes. This element also has 26 meta states, with the most stable being 164mTm (t1/2 5.1 minutes), 160mTm (t1/2 74.5 seconds) and 155mTm (t1/2 45 seconds).

The isotopes of thulium range in atomic weight from 144.97007 u (145Tm) to 178.95534 u (179Tm). The primary decay mode before the most abundant stable isotope, 169Tm, is electron capture, and the primary mode after is beta emission. The primary decay products before 169Tm are erbium isotopes, and the primary products after are ytterbium isotopes.



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