Caesium-133 (Cs-133)

Identity

Protons

55

Neutrons

78

Mass number

133

Mass

132.9055 ± 0.0080 u

Mass excess

-88.071 MeV

Spin

7/2+*

Stability

stable

Natural occurrence

100.00 % of caesium

Produced by

• Xe-133
• Ba-133