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Isotopic enrichment (%)
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Atomic Number: 81
Atomic Weight: 204.3833
Melting Point: 577 K (304°C or 579°F)
Boiling Point: 1746 K (1473°C or 2683°F)
Density: 11.8 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 6
Group Number: 13
Group Name: none
Thallium has two stable isotopes and one of these, Tl-203, is used to produce one of the (workhorses( of nuclear medicine: Tl-201. Tl-201 is used extensively for imaging and in particular for perfusion tests of the myocardium. These tests are done to determine the damage to the heart from a heart attack or from heart diseases. Tl205 has been proposed as an alternative target for the production of Tl-201. Tl-205 is also used in nuclear magnetic resonance research.
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