A thyroid uptake scan wouldn't normally be needed unless it is suspected that thyroid tissue was missed during surgery (sometimes thyroid tissue can be found in other areas of the body), or the...
No isolation or special precautions are needed after a thyroid scan. The patient should check with his or her physician about restarting any medications that were stopped before the scan.
Radiation in any form comes with risks. Especially with children. Thyroid ultrasound and improved blood testing has nearly eliminated the need for most uptake scans for adults and children.