Thyroid Scanning, side effects?

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I had my regular check up with my typhoid because I have a hypothyroid. My doctor advised me to have a thyroid scanning to check if my goiter is cancerous or not. I am not very familiar with this test. So I researched through the net and here's what I found: "A thyroid scan, or radioactive iodine uptake test is a type of nuclear imaging test. During test, a small amount of radioactive material is used to help diagnose diseases of the thyroid gland. The test itself is simple, but must be performed over two days to get accurate information on the thyroid." My concern is the unknown side effect since this involves nuclear medicine and I am still single, afraid that I won't be able to give birth anymore. Does anyone here have knowledge about thyroid scan?