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Reference.org
Iodine-129
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<p>Iodine-129 (129I) is a long-lived <a href="/facts/Radioisotope/5WpCfbdq">radioisotope</a> of <a href="/facts/Iodine/JlfMecMf">iodine</a> that occurs naturally but is also of special interest in the monitoring and effects of man-made nuclear <a href="/facts/Fission_product/xJd9MXXH">fission products</a>, where it serves as both a tracer and a potential radiological contaminant. </p>