Thulium, with the chemical symbol Tm and atomic number 69, was discovered in 1879 by Swedish chemist Per Teodor Cleve. Cleve isolated thulium from ores containing erbium and ytterbium and named it after the mythical continent "Thule."

Thulium is rare on Earth, constituting only about 0.00005% of the Earth's crust. Despite its limited abundance, it has gained significant importance due to its unique properties and applications. Thulium is used in medicine, particularly in specific laser devices for surgical procedures and tissue ablation. Its efficient emission of infrared light makes it valuable in telecommunications and data storage.

The production route of thulium begins with extraction from minerals such as monazite and xenotime, which contain rare earth elements. Through complex chemical processes, including extraction and precise fractionation, pure thulium is isolated.

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