What Is Thallium

Name Origin
Greek: thallos (young shoot) from a bright-green line in its spectrum.
"Thallium" in different languages.

Sources
Found in iron pyrites. Also in the minerals crookesite (TlCu7Se4), hutchinsonite (TlPbAs5S9) and lorandite (TlAsS2). It is found in the Earth's crust at a concentration estimated to be 0.6mg/kg. Annual production is around 30 tons.




Abundance
Universe: 0.0005 ppm (by weight)
Sun: 0.001 ppm (by weight)
Carbonaceous meteorite: 0.08 ppm
Earth's Crust: 0.6 ppm
Seawater: 1.4 x 10-5 ppm




Uses
Its compounds were used in rat and ant poisons, but this use is no longer allowed in many countries due to safety concerns. Also for in gamma radiation detecting equipment, detecting infrared radiation and heart muscle research. Thallium sulfide's electrical conductivity changes with exposure to infrared light therefore making this compound useful in photocells.
Combined with sulfur or selenium and arsenic, thallium has been used in the production of high-density glasses that have low melting points in the range of 125 and 150°C. These glasses have room temperature properties that are similar to ordinary glasses and are durable, insoluble in water and have unique refractive indices.
Thallium amalgam is used in thermometers for low temperature, because it freezes at -58°C (pure mercury freezes at -38°C).

Category:

Science & Technology

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[MrStealthism]

What was the music piece used?