Thallium-203 (Tl-203)

Identity

Protons

81

Neutrons

122

Mass number

203

Mass

203.0 ± 1.3 u

Mass excess

-25.761 MeV

Spin

1/2+*

Stability

stable

Natural occurrence

29.52 % of thallium

Produced by

• Hg-203
• Pb-203