definitions - understudies. understudy (n.) 1.someone who takes the place of another (as when things get dangerous or difficult)the star had a stand-in for dangerous scenes we need extra employees for summer fill-ins. 2.an actor able to replace a regular performer when required. understudy (v.)
Radiation can come in the form of a pill. Iodine (131 I) used in thyroid treatment might be given in pill form or as a liquid. The choice is an institutional decision based on many factors, including the amount to be given to a patient.
Radioactive iodine (I-131) has been used to treat over-active thyroid disorders (hyperthyroidism) since the early 1940s. It is an effective method of treatment. It is now being used more often as a first-line treatment rather than surgery. Radioactive iodine is taken up by the thyroid, and destroys the cells in the thyroid gland, causing the gland to shrink, reducing the amount of thyroxine made by the thyroid gland.