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thulium

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thulium

Soft, silver-white, malleable and ductile, metallic element of the lanthanide series, atomic number 69, relative atomic mass 168.94. It is the least abundant of the rare earth metals, and was first found in gadolinite and various other minerals. It is used in arc lighting.

The X-ray-emitting isotope Tm-170 is used in portable X-ray units. Thulium was named by Swedish chemist Per Cleve in 1879 after the northland, Thule.
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They’re generally clustered in a separate grouping at the bottom of the table, are known collectively as the lanthanoids, and these are their names, in order of atomic number (57-70): lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, and ytterbium.
Why all the fuss over rare earths? by Doug Hornig / Stockhouse
Each segment contains small amounts of ions of relatively rare metals, such as dysprosium, thulium, and cerium, which fluoresce in different colors.
Microscopic glass ribbons provide molecular labels. (Materials ... by Science News
The laser rod, or lasing medium, currently being tested uses erbium, thulium, and holmium added to a YAG crystal.
Emerging Dental Technologies Update by Richards, Frances / Medical Equipment Designer
 
 
 
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