GREY:BHNGF - Post by User
Post by
Tizianon Oct 13, 2011 6:32pm
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Post# 19147299
They found Thulium
They found ThuliumThulium is a
chemical element that has the symbol
Tm and
atomic number 69. Thulium is the second least abundant of the
lanthanides (
promethium is only found in
trace quantities on Earth). It is an easily workable
metal with a bright silvery-gray luster. Despite its high price and rarity, thulium is used as the radiation source in portable
X-ray devices and in
solid-state lasers.
The price per kilogram has oscillated between US$ 4,600 and $13,300 inthe period from 1959 to 1998 for 99.9% purity, and it was second highestfor lanthanides behind
lutetium.
The principal sources today are the ion adsorption clays of southern China.
They also have
lutetium.