Iodide

<p>Iodine-131 (in the chemical form of iodide) is a component of&nbsp;<a href="http://en.wikipedia.org/wiki/Nuclear_fallout" title="Nuclear fallout" >nuclear fallout</a>&nbsp;and a particularly dangerous one owing to the thyroid gland's propensity to concentrate ingested iodine, where it is kept for periods longer than this isotope's radiological half-life of eight days. For this reason, if people are expected to be exposed to a significant amount of environmental radioactive iodine (iodine-131 in fallout), they may be instructed to take non-radioactive potassium iodide tablets. The typical adult dose is one 130&nbsp;mg tablet per 24 hours, supplying 100&nbsp;mg (100,000&nbsp;<a href="http://en.wikipedia.org/wiki/Micrograms" title="Micrograms" class="mw-redirect" >micrograms</a>) iodine, as iodide ion. (Note: typical daily dose of iodine to maintain normal health is of order 100 micrograms; see "Dietary Intake" below.) By ingesting this large amount of non-radioactive iodine, radioactive iodine uptake by the thyroid gland is minimized. See the main article above for more on this topic.<sup id="cite_ref-21" class="reference" ><a href="http://en.wikipedia.org/wiki/Iodine#cite_note-21" >[22]</a></sup></p>