Iodine | Radiation Protection | US EPA

Iodine (chemical symbol I) is a nonmetallic solid element. There are both radioactive and non-radioactive isotopes of iodine. Iodine-129 and -131 are the most important radioactive isotopes in the environment. Some isotopes of iodine, such as I-123 and I-124 are used in medical imaging and treatment, but are generally not a problem in the environment because they have very short half-lives.

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Iodine | Radiation Protection | US EPA


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Reference Information
People and Discoveries
Commonly Encountered Radionuclides
Americium-241
Cesium-137
Cobalt-60
Iodine-129 &-131
Plutonium
Radium
Radon
Strontium-90
Technetium-99
Tritium
Thorium
Uranium