Ra

Radium-215m

Protons (Z)

88

Neutrons (N)

127

Mass number

215

Half-Life

7.31 µs

Abundance

---

Mass

215.005 u

Mass Excess

4,410.0 keV

Spin

(25/2+)

Discovered

1983

Binding energy per nucleon

7,731 keV

Neutron separation energy

3,754 keV

Proton separation energy

1,921 keV

Decay Mode

γRadium-215100%

Decay chain

Radium-215Z 88 · N 1277.31 µs
γ100%
α100%
β⁺72.6%
EC58.2%
α100%