thulium

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thu·li·um

(tho͞o′lē-əm)

n. Symbol Tm

A bright, soft, silvery, metallic element of the lanthanide series obtained commercially from the mineral monazite, having an x-ray emitting isotope that is used in portable medical x-ray units. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,950°C; specific gravity 9.321 (at 25°C); valence 2, 3. See Periodic Table.

[After Thule¹.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

thulium

(ˈθjuːlɪəm)

(Elements & Compounds) 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

[C19: New Latin, from Thule + -ium]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

thu•li•um

(ˈθu li əm)

n.

a rare-earth metallic element found in gadolinite and other uncommon minerals. Symbol: Tm; at. wt.: 168.934; at. no.: 69; sp. gr.: 9.32.

[< French (1879), after Thule, taken as a name for ancient Scandinavia; see -ium²]

thu·li·um

(tho͞o′lē-əm)

Symbol Tm A soft, easily shaped, silver-gray metallic element of the lanthanide series. An artificial radioactive isotope of thulium is used as a radiation source in small, portable x-ray machines. Atomic number 69. See Periodic Table.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun

thulium - a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

atomic number 69, Tm

metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

apatite - a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus

monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium

xenotime - a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form

tulio

thulium

[ˈθjuːlɪəm] N → tulio m

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

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References in periodicals archive ?

Goldman, MD, enrolled 20 subjects with at least moderate photoaging who randomly received three treatments with either the 1,064/ 532-nm fractionated picosecond Nd:YAG laser or with the 1,927-nm fractionated thulium fiber laser on each side of the face, 4 weeks apart.

Trial compares outcomes of two different lasers on photoaging

It consists of yttrium and the 15 lanthanide elements - lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.

What are rare earths and how important are they?

Two [micro]m CW laser is also known as thulium laser, which has a wavelength of 2013 nm and a penetration depth in tissue of 0.3 mm.

Development of Medical Lasers for Treatment on Benign Prostatic Hyperplasia

Comparison of holmium:YAG and thulium fiber laser lithotripsy: ablation thresholds, ablation rates, and retropulsion effects.

Moses technology in a stone simulator

He indicates that currently thulium fiber lasers in the 1.5-2 [micro]m range are best for the processing of transparent welding.

Laser machining and processing advance to enable more applications for orthopedic device manufacturers

Caption: Figure 3: (a) Absorption spectra of ASA in different concentrations of thulium (III); (b) molar ratio of thulium(III)-arsenazo III complex at [lambda] = 605 nm (pH 7.40).

Drug Effect of Thulium(III)-Arsenazo III Complex on Herring Sperm DNA

Murray, "High-power thulium fiber laser ablation of urinary tissues at 1.94 [micro]m," Journal of Endourology, vol.

Black Phosphorus Q-Switched Large-Mode-Area Tm-Doped Fiber Laser

Following salts of lanthanides were used as standards: Samarium (III) chloride hexahydrate, Lanthanum (III) nitrate hexahydrate, Europium (III) nitrate hexahydrate, Terbium (III) nitrate hexahydrate, Holmium(III) nitrate hydrate, Thulium (III) nitrate hexahydrate, Lutetium (III) nitrate hexahydrate, Erbium (III) nitrate hexahydrate, Samarium (III) nitrate hexahydrate, Neodymium (III) nitrate hexahydrate, Gadolinium (III) nitrate hexahydrate, Dysprosium (III) nitrate pentahydrate, Ytterbium (III) nitrate pentahydrate, and Cerium (III) nitrate hexahydrate.

Determination of Lanthanides in Fossil Samples Using Laser Induced Breakdown Spectroscopy

Motalov, "Thermodynamic properties of neutral and charged species in high-temperature vapour over terbium and thulium trichlorides," High Temperatures-High Pressures, vol.

Thermal Emission of Alkali Metal Ions from [Al.sub.30]-Pillared Montmorillonite Studied by Mass Spectrometric Method

More recently, optimal keratoplasty (Opti-K, NTK Enterprises, Inc.) has been proposed as a new office-based laser vision correction procedure performed with a continuous-wave thulium fiber laser that reshapes the cornea to temporarily improve the symptoms of presbyopia and correct low to moderate hyperopia similarly to LTK.

Optimal Keratoplasty for the Correction of Presbyopia and Hypermetropia

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