Isotopes of Iodine

Notes

There are 37 isotopes of iodine and only one, I-127, is stable.

Notable Isotopes

127I [74 neutrons]

Abundance: 100%

Stable with 74 neutrons

129I [76 neutrons]

Abundance: synthetic

Half life: 1.57 x 107 years [ beta- ]

Decay Energy: 0.194 MeV

Decays to 129Xe.

131I (radioiodine) [78 neutrons]

Abundance: synthetic

Half life: 8.02070 days [ beta- ]

Decay Energy: 0.971 MeV

Decays to 131Xe.

Has been used in treating cancer and other pathologies of the thyroid gland.