Updated October 20, 2022
I-129 is radioactive iodine. It is used medically to destroy thyroid tissue and thyroid cancer.
I-129 is also a natural breakdown product of plutonium. It is released during any nuclear accident such as Fukishima in Japan 3/11/2011. It is advised to take iodine (adult: 100 mg iodine) before exposure to decrease the chances of absorbing the radioactive form.
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