Thulium-171 (Tm-171)

Identity

Protons

69

Neutrons

102

Mass number

171

Mass

170.9 ± 1.0 u

Mass excess

-59.210 MeV

Spin

1/2+*

Stability

Half-life: 1.92 years

Natural occurrence

Not found in nature

Decays to

• beta minus → Yb-171