Xenon Xe-133

**Semantic type:** Element, Ion, or Isotope

**Definition:** A radioisotope of xenon, an element with 54 protons, having gamma emissions and a physical half-life of 5.27 days. Xenon-133 is used in the study of pulmonary function and organ blood flow.

**Synonyms:** - XENON XE-133 - Xeneisol - Xenon (133Xe) - Xenon X-133 - Xenon, Isotope of Mass 133