Resume daily life. If thyroid scan was performed with iodine 123 or technetium 99m pertechnetate involves a low amount of radiation. The half lives are short enough (13 and 6 hours) that most irradiation will have dissipated by 24-48 hours. Whatever i123 does not accumulate in thyroid gland are excreted via kidneys, saliva, and sweat. Tc 99m usually exits via kidneys, GI tract, and saliva. I131 involves higher dose.
Follow up with MD. What was the reason for the thyroid scan? Discuss what the results are with your physician to determine whether or not you need treatment of any thyroid dysfunction, if any.