Po

Polonium-189

Protons (Z)

84

Neutrons (N)

105

Mass number

189

Half-Life

3.5 ms

Abundance

---

Mass

188.998 u

Mass Excess

-1,422.0 keV

Spin

(5/2-)

Discovered

1999

Binding energy per nucleon

7,731 keV

Neutron separation energy

8,949 keV

Proton separation energy

1,516 keV

Decay Mode

Decay chain

Polonium-189Z 84 · N 1053.5 ms
α100%
β⁺66%
β⁺100%
β⁺94%
β⁺99.74%
β⁺~100%
β⁺100%
EC100%