My niece has just been diagnosed with thyroid cancer. They want to remove her thyroid ASAP because she is going to Hong Kong in February to care for her mother and may be gone for two months. She is OK with the surgery but wants to know why she has to swallow radioactive pill after surgery if her thyroid has been removed. Is this really necessary and why? They said it's in case there is still thyroid tissue left but wouldn't that mean they did a poor job of removing it all. Thanks for any insight you can give.