Radioactive iodine
When there is an accident at a nuclear power plant — if there's an explosion or a leak or it's damaged in some way in war — radioactive iodine is one of the first substances that's released into the atmosphere.
If that radioactive iodine gets into the body, it can damage cells in the thyroid and result in cancer.
You can inhale radiation, or it can get into your body via the skin. But you can't see, smell or taste it in the air. It's an invisible threat.
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