Thallium 201 chloride

Dr Henry Knipe and Dr Neil Lall et al.

Thallium 201 Chloride is a radiopharmaceutical used in cardiac imaging.


  • photon energy: 80 keV
  • physical half life: 55 hours
  • biological half life
    • rest: 3 minutes
    • exercise: 30 seconds
  • normal distribution: myocardium, skeletal muscle, GI tract, liver, kidneys
  • excretion: renal
  • target organ: kidneys
  • pharmacokinetics:
  • miscelaneous facts: 
    • more background noise than MUGA
    • cerebral SPECT can be used to differentiate toxoplasmosis vs lymphoma (increased uptake in lymphoma, decreased in toxoplasmosis)

Uses, doses and timings

Cardiac Scan
  • adult dose: 1.5 mCi IV
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Article information

rID: 24811
Section: Physics
Synonyms or Alternate Spellings:
  • Th 201 chloride

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