Radium-225 (Ra-225)

Identity

Protons

88

Neutrons

137

Mass number

225

Mass

225.0 ± 2.8 u

Mass excess

21.993 MeV

Spin

1/2+*

Stability

Half-life: 14.8 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Ac-225

Produced by

• Th-229