How is radioactive iodine treatment dangerous to others not taking the treatment?

Radioactive iodine treatment can pose a risk to others because the treated individual emits radiation, particularly in bodily fluids like saliva, urine, and sweat, for a period following the treatment. This exposure can be harmful, especially to sensitive populations such as children and pregnant women. To mitigate these risks, patients are often advised to maintain distance from others and follow specific precautions during the initial weeks post-treatment.