A white metallic element, atomic no. 81, atomic wt. 204.3833; 201Tl (half-life equal to 3.038 days) is used to scan the myocardium. [G. thallos, a green shoot (it gives a green line in the spectrum)]
- t.-201 (201Tl) the radioisotope of t. used widely for myocardial nuclear imaging; it is also taken up by certain tumors.
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thal·li·um 'thal-ē-əm n a sparsely but widely distributed poisonous metallic element that resembles lead in physical properties and is used chiefly in the form of compounds in photoelectric cells or as a pesticide symbol Tl see ELEMENT (table)
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n.
a leadlike element that has several dangerously poisonous compounds. The poison is cumulative and causes liver and nerve damage and bone destruction. The victim's hair is likely to fall out and does not grow again. Treatment is by administration of chelating agent. Symbol: Tl.
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thal·li·um (Tl) (thalґe-əm) [Gr. thallos green shoot] a heavy, soft, bluish white metal; atomic number, 81; atomic weight, 204.37; specific gravity, 11.85; used in some manufacturing processes and formerly used as a rodenticide. Its salts are active poisons, causing thallium poisoning; see under poisoning.Medical dictionary. 2011.