Hafnium-181 (Hf-181)

Identity

Protons

72

Neutrons

109

Mass number

181

Mass

180.9 ± 1.5 u

Mass excess

-47.403 MeV

Spin

1/2-

Stability

Half-life: 42.4 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Ta-181