system
Given the following post, respond as if you're commenting on Reddit:
human
Do Iodine tablets prevent radiation sickness?

Saw Iodine being administered in two separate TV shows. Does it really help? How does it work?
gpt
Not exactly, a large amount of the radiation dose from a nuclear explosion comes in the form of a radioactive isotope of iodine.  You take large doses of safe iodine and that means your thyroid won't absorb the radioactive one, and you'll just piss it out instead of ending up with a radioactive thyroid.