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thulium

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thulium

a malleable ductile silvery-grey element occurring principally in monazite. The radioisotope thulium-170 is used as an electron source in portable X-ray units. Symbol: Tm; atomic no.: 69; atomic wt.: 168.93421; valency: 3; relative density: 9.321; melting pt.: 1545°C; boiling pt.: 1950°C
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

thulium

[′thü·lē·əm]
(chemistry)
A rare-earth element, symbol Tm, of the lanthanide group, atomic number 69, atomic weight 168.9342; reacts slowly with water, soluble in dilute acids, melts at 1550°C, boils at 1727°C; the dust is a fire hazard; used as x-ray source and to make ferrites.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
Two-micrometer thulium laser resection of the prostate-tangerine technique in benign prostatic hyperplasia patients with previously negative transrectal prostate biopsy.
Considering, the probability of occurrence of transition from state 3 to state 1 is more as compared either to that from state 3 to state 0 or from state 1 to state 0 and also, assuming total population inversion, the metastable population densities of thulium ion becomes:
Shimizu "S-band Thulium-doped fiber amplifier employing high Thulium concentration doping technique", J.
All procedures were performed by one doctor with more than 10 years of experience with TURP and 4 years of experience with thulium laser resection of the prostate.
Huang, "Sensitized thulium ultraviolet upconversion luminescence in [Tm.sup.3+]/[Yb.sup.3+]/[Nd.sup.3+] triply doped nanoglass ceramics," Optics Letters, vol.
The heavy rare earth element concentrate from the project contained 24.54% samarium, 4% europium, 21.82% gadolinium, 25.65% dysprosium, 3.14% holmium, 5.96% erbium, 1.71% thulium, 6.09% ytterbium, and 1.08% lutetium.
THULIUM 20 - 8 + 21 + 12 + [square root of (9] x [21 - 13]) = 69
Novel energy sources, including a diode laser and a thulium laser, have been shown to be effective for BPE treatment.
'long persistent phosphors' and solar panels) that are under development, some of which will require the more obscure heavy rare earths such as ytterbium, erbium, holmium and thulium.
21 Sc (Scandium) * Parodi 1998 64 Gd (Gadolinium)* 39 Y (Yttrium) * 65 Tb (Terbium) 57 La (Lanthanum) * 66 Dy (Dysprosium)* 58 Ce (Cerium) * 67 Ho (Holmium) 59 Pr (Praseodymum) * 68 Er (Erbium) 60 Nd (Neodymum) * 69 Tm (Thulium) 61 Pm (Promethium) 70 Yb (Ytterbium) 62 Sm (Samarium) * 71 Lu (Lutetium) 63 Eu (Europium) * present at Trimouns (Moelo et al., 1974) Table 2.
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