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.
How and When KI Protects. 1  Potassium iodide (KI) blocks uptake of radioactive iodine by the thyroid gland. 2  KI protects only the thyroid from radioactive iodine uptake. 3  KI is effective as a radiation medical countermeasure only for internal contamination with radioactive iodine.