Thallium-201 chloride

Thallium-201 chloride is a radiopharmaceutical used primarily in cardiac imaging.


  • photon energy: 80 keV
  • physical half life: 73 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:
  • miscellaneous facts: 
    • more background noise than MUGA
    • 201Tl-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: 55.5 MBq (1.5 mCi) IV
Physics and imaging technology: nuclear medicine
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Article information

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

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