Your apprehension about radioiodine is unnecessary.
Radioiodine is the first line of treatment of hyperthyroidism
in the United states.
In india, radioiodine is being used extensively for more than 40 years.
The amount of radioiodine used for hyperthyroidism (5 mCi to 15 mCi) is very small and will not cause cancer.
I personally, have treated several hundred patients with radioiodine without any side effects. Infact, the side effects of PTU, is far riskier than radioiodine itself