I

Iodine-121m

Protons (Z)

53

Neutrons (N)

68

Mass number

121

Half-Life

9.0 µs

Abundance

---

Mass

120.91 u

Mass Excess

-83,869.0 keV

Spin

(21/2+)

Discovered

1982

Binding energy per nucleon

8,422 keV

Neutron separation energy

8,193 keV

Proton separation energy

1,796 keV

Decay Mode

γIodine-121100%

Decay chain

Iodine-121Z 53 · N 689.0 µs
γ100%
β⁺100%
β⁺100%