xenon-133
Xenon-133 is a radiopharmaceutical principally used when a performing VQ scan. Inhalation of this gas can also be used to assess cerebral blood flow.
- Mode of decay: Beta decay
- photon energy: 81 KeV
- physical half-life: 5.27 days
- biological half-life: 30 seconds
- normal distribution: lungs
- <15% of inhaled gas is absorbed
- excretion: lungs
- target organ: lungs
Xenon-133 is a fission product from uranium-235. The gas is normally supplied in a concentration of 5% with 95% carbon dioxide.
Uses, dosages, and time of imaging
V/Q scan: ventilation agent
- dose: 370-740 MBq (10-20 mCi) inhaled
- time of imaging: immediate
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