Y

Yttrium-99m

Protons (Z)

39

Neutrons (N)

60

Mass number

99

Half-Life

8.2 µs

Abundance

---

Mass

98.926 u

Mass Excess

-68,502.0 keV

Spin

(17/2+)

Discovered

1985

Binding energy per nucleon

8,455 keV

Neutron separation energy

4,284 keV

Proton separation energy

9,369 keV

Decay Mode

γYttrium-99100%

Decay chain

Yttrium-99Z 39 · N 608.2 µs
γ100%
β⁻98.23%
β⁻100%
β⁻100%
β⁻100%
β⁻100%