krypton-81m

krypton-81m
n.
a radioactive gas that is the shortest-lived isotope in medical use (half-life 13 seconds). It can be used to investigate the ventilation of the lungs. The patient breathes a small quantity of the gas, the arrival of which in different parts of the lungs is recorded by means of a gamma camera. This is often performed as part of ventilation-perfusion scanning to look for pulmonary emboli. See also rubidium-81.

Medical dictionary. 2011.

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  • krypton Kr 81m — [USP] an unstable radioactive isotope of krypton, atomic mass 81, having a half life of 13 seconds and emitting gamma rays (0.19 MeV); it is used in pulmonary ventilation studies to evaluate regional function …   Medical dictionary

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  • rubidium-81 — n. an artificial radioactive isotope that has a half life of about four hours and decays into the radioactive gas krypton 81m, emitting radiations as it does so. It provides a useful source of krypton 81m for use in ventilation perfusion scanning …   The new mediacal dictionary

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  • xenon-133 — A radioisotope of xenon with a gamma emission at 81 keV and a physical half life of 5.243 days; used in the study of pulmonary function and organ blood flow. * * * n …   Medical dictionary

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