Yttrium-90 (Y-90)

Identity

Protons

39

Neutrons

51

Mass number

90

Mass

89.91 ± 0.38 u

Mass excess

-86.497 MeV

Spin

2-*

Stability

Half-life: 2.67 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Zr-90

Produced by

• Sr-90