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iodine I 131 A radioactive isotope of iodine with an atomic mass of 131, a half life of eight days, and potential antineoplastic activity. Selectively accumulating in the thyroid gland, iodine I 131 emits beta and gamma particles, thereby killing thyroid cells and decreasing thyroid hormone production. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)
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US brand name: | ![](https://webarchive.library.unt.edu/eot2008/20081006044621im_/http://www.nci.nih.gov/images/spacer.gif) | Iodotope | | ![](https://webarchive.library.unt.edu/eot2008/20081006044621im_/http://www.nci.nih.gov/images/spacer.gif) | Foreign brand name: | ![](https://webarchive.library.unt.edu/eot2008/20081006044621im_/http://www.nci.nih.gov/images/spacer.gif) | Iodotrope | | ![](https://webarchive.library.unt.edu/eot2008/20081006044621im_/http://www.nci.nih.gov/images/spacer.gif) | Abbreviation: | ![](https://webarchive.library.unt.edu/eot2008/20081006044621im_/http://www.nci.nih.gov/images/spacer.gif) | I 131 | | ![](https://webarchive.library.unt.edu/eot2008/20081006044621im_/http://www.nci.nih.gov/images/spacer.gif) |
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