thallium is a topic covered in the Taber's Medical Dictionary.

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(thal′ē-ŭm )

[Gr. thallos, a young shoot + -ium (1)]
SYMB: Tl A metallic element, atomic weight (mass) 204.37, atomic number 81, specific gravity, 11.85. Its salts may be poisonous in overdose; its radioisotope is used to assess myocardial perfusion and viability.
CAS # 7440-28-0

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