Iridium Ir 192

**Semantic type:** Element, Ion, or Isotope|Indicator, Reagent, or Diagnostic Aid

**Definition:** A radioactive isotope of iridium. Iridium-192 emits gamma rays and has a half-life of 74 days. A high dose rate of this radioisotope can be used in brachytherapy to treat tumors by selectively delivering a cytotoxic dose of radiation to the tumor site.

**Synonyms:** - IRIDIUM IR-192 - Ir-192 - Iridium-192