Isotopes of holmium

Isotopes of holmium (67Ho)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
163Ho synth 4570 y ε 163Dy
164Ho synth 28.8 min ε 164Dy
β− 164Er
165Ho 100% stable
166Ho synth 26.812 h β− 166Er
166m1Ho synth 1133 y β− 166Er
167Ho synth 3.1 h β− 167Er
Standard atomic weight Ar°(Ho)
  • 164.930329±0.000005
  • 164.93±0.01 (abridged)

Natural holmium (67Ho) contains one observationally stable isotope, 165Ho. The known isotopes of holmium range from 140Ho to 175Ho. The primary decay mode before the stable 165Ho, is beta plus decay to dysprosium isotopes, and the primary mode after is beta minus decay to erbium isotopes.

Among the synthetic radioactive isotopes the most stable is 163Ho with a half-life of 4,570 years, the next most stable is 166Ho having a half-life of 26.812 hours, and others are under 4 hours. The isomeric nuclide 166m1Ho, however, has a half-life of 1,133 years, much the longest of the meta states.

Holmium-166 (ground state) has been studied for medical application.

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