Like iodine pills?
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If you’re in a situation with something like radioactive fallout, the dust in the air and water and food you eat can become radioactive. If you breathe/drink/eat that, you now have radioactive stuff in your body.
Specifically of concern are radioactive iodine atoms, because your thyroid absorbs iodine rapidly. If you get radioactive iodine in your system it’ll be absorbed and irradiate you slowly and constantly.
So the iodine pills a specifically a form of iodine that bonds even more rapidly and strongly to your thyroid, blocking the radioactive atoms from getting in and you just pee/poop them out eventually.
So it doesn’t protect you from direct radiation exposure or from other sources, it just prevents you from absorbing the radioactive iodine.
EDIT don’t quote me, but I’m pretty sure the pills are potassium iodide, and yes, I do keep a bottle in my work bag as a just in case.
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