Rn

Radon-209m

Protons (Z)

86

Neutrons (N)

123

Mass number

209

Half-Life

13.4 µs

Abundance

---

Mass

208.992 u

Mass Excess

-7,767.0 keV

Spin

13/2+

Discovered

1985

Binding energy per nucleon

7,787 keV

Neutron separation energy

6,183 keV

Proton separation energy

2,586 keV

Decay Mode

γRadon-209100%

Decay chain

Radon-209Z 86 · N 12313.4 µs
γ100%
β⁺83%
β⁺96.1%
α99.546%
EC100%