6 doctors weighed in:
What happens to iodine-131 in the body after it has been used to treat thyroid cancer?
6 doctors weighed in

Dr. Susan Wingo
Internal Medicine - Endocrinology
4 doctors agree
In brief: Same as plan iodine
You ingest iodine every day - in salt, salty foods, seafood, many breads, & red food coloring.
The thyroid absorbs what it needs; the rest is excreted into the urine (+ a little into sweat, saliva, and other secretions). The i-131 atoms that decay in the thyroid cells (and give off beta and gamma energy that kills thyroid cells) become nonradioactive xenon-131 atoms, and are breathed out.

In brief: Same as plan iodine
You ingest iodine every day - in salt, salty foods, seafood, many breads, & red food coloring.
The thyroid absorbs what it needs; the rest is excreted into the urine (+ a little into sweat, saliva, and other secretions). The i-131 atoms that decay in the thyroid cells (and give off beta and gamma energy that kills thyroid cells) become nonradioactive xenon-131 atoms, and are breathed out.
Dr. Susan Wingo
Dr. Susan Wingo
Thank
Dr. Chakshu Gupta
Pathology
In brief: Passes out
Looses its radioactivity and is mostly passed out in the urine and saliva.

In brief: Passes out
Looses its radioactivity and is mostly passed out in the urine and saliva.
Dr. Chakshu Gupta
Dr. Chakshu Gupta
Thank
Get help from a real doctor now
Dr. Vicken Poochikian
Board Certified, Internal Medicine
38 years in practice
2M people helped
Continue
108,000 doctors available
Read more answers from doctors