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Topic: Technetium

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	Technetium (Tc) - Chemical properties, Health and Environmental effects
		The chemistry of technetium is said to be similar to that of rhenium.
		Technetium has been found in the spectrum of S-, M-, and N-type stars, and its presence in stellar matter is leading to new theories of the production of heavy elements in the stars.
		Because technetium is produced in tonne quantities in nuclear reactors, it is adding to the planetary burden of unwanted radioactive waste.
	www.lenntech.com /Periodic-chart-elements/Tc-en.htm (753 words)

	Learn more about Technetium in the online encyclopedia. (Site not responding. Last check: 2007-10-14)
		Technetium dissolves in aqua regia, nitric acid, and concentrated sulfuric acid, but it is not soluble in hydrochloric acid.
		Technetium is one of the most powerful known preventatives of rust, and is also a valuable source of beta rays.
		Technetium is one of two elements in the first 83 that have no stable isotopes (the other element is promethium).
	www.onlineencyclopedia.org /t/te/technetium.html (910 words)

	Technetium - Wikipedia, the free encyclopedia
		Most technetium produced on Earth is a by-product of fission of uranium-235 in nuclear reactors and is extracted from nuclear fuel rods.
		Technetium is a silvery-grey radioactive metal with an appearance similar to platinum.
		Technetium is one of three elements in the first 82 that have no stable isotopes.
	en.wikipedia.org /wiki/Technetium (4312 words)

	Technetium Heart Scan: Encyclopedia of Medicine
		The technetium heart scan is a noninvasive nuclear scan that uses a radioactive isotope called technetium to evaluate blood flow after a heart attack.
		The technetium heart scan is a nuclear heart scan, which means that it involves the use of a radioactive isotope that targets the heart, and a radionuclide detector that traces the absorption of the radioactive isotope.
		The technetium heart scan is usually performed in a hospital's nuclear medicine department but it can be done at the patient's bedside during a heart attack if the equipment is available.
	health.enotes.com /medicine-encyclopedia/technetium-heart-scan (870 words)

	Technetium-99m generator - Wikipedia, the free encyclopedia
		technetium cow" (a device for separating Tc-99m from its parent isotope, Mo-99) at Brookhaven National Laboratory.
		Tc of technetium from a source of decaying molybdenum-99.
		Mo has a half-life of 66 hours and can be easily transported over long distances to hospitals where its decay product technetium-99m (with an inconvenient half-life of only 6 hours for transport) is extracted and used for a variety of nuclear medicine diagnostic procedures, where its low half-life is very useful.
	en.wikipedia.org /wiki/Technetium-99m_generator (329 words)

	ELEMENT: TECHNETIUM
		Technetium has been found in the spectrum of S-, M-, and N-type stars, and its presence in stellar matter is leading to new theories of the production of heavy elements in the stars.
		The chemistry of technetium is said to be similar to that of rhenium.
		Technetium dissolves in nitric acid, aqua regia, and conc.
	www.radiochemistry.org /periodictable/elements/43.html (488 words)

	Technetium (Tc) (Site not responding. Last check: 2007-10-14)
		Technetium is a silvery-gray metal that tarnishes slowly in moist air and was the first element to be created artificially.
		Technetium-99 is used in medicine for imaging because of its half-life being short, the energy of the gamma ray it emits, and the ability of technetium to be chemically bound to many biologically active molecules.
		Technetium is used in the steel industry because it is a remarkable corrosion inhibitor.
	www.bayerus.com /msms/fun/pages/periodic/technetium/index.html (135 words)

	Technetium-99 \| Radiation Protection Program \| US EPA (Site not responding. Last check: 2007-10-14)
		Discovery of technetium in 1937 in the form of technetium-97 has been credited to Emilio Segré; and Carlo Perrier at the University of California - Berkeley.
		In this case, the nuclear reactor provides the radioactive parent, molybdenum-99, for the technetium generator.
		Special tests that measure the level of radioactivity from Tc-99 or other technetium isotopes in the urine, feces, and exhaled air can determine if a person has been exposed to technetium.
	www.epa.gov /radiation/radionuclides/technetium.htm (1014 words)

	C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - TECHNETIUM
		I first encountered technetium shortly after I got my Ph.D. While doing a stint as a researcher in an industrial microanalysis laboratory, I was asked to determine the distribution of technetium on bone surfaces using electron microscopy and X-ray analysis.
		The technetium-99 in the radiopharmaceutical was made by neutron irradiation of molybdenum, similar to the technetium first analyzed by Carlo Perrier and Emilio Segrè; in 1937.
		Technetium is found in the spectra of stars and has interesting implications for nucleosynthesis.
	pubs.acs.org /cen/80th/technetium.html (808 words)

	Technetium (Site not responding. Last check: 2007-10-14)
		Technetium, Tc, is a transition metal element, found in Group VIIa of the periodic table.
		Technetium is a silvery metal that tarnishes in air.
		Technetium is a powerful corrosion inhibitor for steel, even at the 5 ppm level.
	www.ucc.ie /ucc/depts/chem/dolchem/html/elem/elem043.html (57 words)

	Technetium Detection and Containment
		Technetium (Tc) is element number 43 in the periodic table.
		We were able to look at many of their formulations and determine that the technetium was not completely reduced from the pertechnetate form by the blast furnace slag materials" says Bucher.
		Their research also demonstrates that XAFS spectroscopy is a useful tool for studying the chemistry of technetium in radioactive waste forms.
	www.lbl.gov /Science-Articles/Archive/technetium-waste.html (901 words)

	Technetium
		Because Technetium is not part of the decay series of any naturally radioactive element, scientists had thought that Technetium does not occur in nature.
		Technetium isotopes ranging in mass number from 90 to 111 are now known; the most common isotopes has a mass numbers of 97 and 98.
		Technetium is chemically active and useful in that it forms oxides, sulfides, and technetiates, such as ammonium technetiate (NH 4TcO4).
	www.accuracyingenesis.com /technet.html (373 words)

	Technetium - Free English Encyclopedia from Turkcebilgi (Site not responding. Last check: 2007-10-14)
		This transmutation process is one in which the technetium (andlt;supandgt;99andlt;supandgt;Tc as a metal target) is bombarded with neutrons to form the shortlived andlt;supandgt;100andlt;supandgt;Tc (half life = 16 seconds) which decays by beta decay to ruthenium (andlt;supandgt;100andlt;supandgt;Ru).
		Technetium is one of three elements in the first 82 that have no stable [[isotope]]s (the other such elements are promethium and tungsten (although because the half-life of tungsten is so long (2.09E19 y), tungsten is usually classed as being stable).
		Technetium, tungsten (although because the half-life of tungsten is so long (2.09E19 y), tungsten is usually classed as being stable), and promethium are remarkable among the light elements in that they have no stable isotopes.
	www.turkcebilgi.com /ansiklopedi/english/Technetium (3673 words)

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	Highbeam Encyclopedia - Search Results for technetium (Site not responding. Last check: 2007-10-14)
		Periodic Table of the Elements: Technetium PERIODIC TABLE OF THE ELEMENTS: TECHNETIUM [Periodic Table of the Elements: Technetium] Periodic Table of the Elements: Technetium
		Tc TC [Tc] symbol for the element technetium.
		Gastrointestinal bleeding in adult patients with Meckel's diverticulum: The role of technetium 99m pertechnetate scan.
	www.encyclopedia.com /articles/12685.html (408 words)

	technetium
		The most useful isotope of technetium, however, is technetium-99m, which is used in many medical radioactive isotope tests because of its short half-life (6.01 hours), the energy of the gamma radiation it emits, and its ability to bind chemically to many biologically active molecules.
		Technetium was once very rare and expensive but is now obtained in quantity from nuclear reactor fission products.
		Periodic Table of the Elements: Technetium - Periodic Table of the Elements: Technetium 43 Tc Technetium (98) 2 · 8 · 18 13...
	www.factmonster.com /ce6/sci/A0848041.html (397 words)

	It's Elemental - The Element Technetium
		It was isolated by Carlo Perrier and Emilio Segrè; in 1937.
		Technetium was created by bombarding molybdenum atoms with deuterons that had been accelerated by a device called a cyclotron.
		Technetium's most stable isotope, technetium-98, has a half-life of about 4,200,000 years.
	education.jlab.org /itselemental/ele043.html (133 words)

	Technetium (Site not responding. Last check: 2007-10-14)
		Nineteen isotopes of technetium, with atomic masses ranging from 90 to 108, are known.
		It is reported that mild carbon steels may be effectively protected by as little as 55 ppm of KTcO4 in aerated distilled water at temperatures up to 250C.
		This corrosion protection is limited to closed systems, since technetium is radioactive and must be confined.
	www.scescape.net /~woods/elements/technetium.html (395 words)

	technetium (Site not responding. Last check: 2007-10-14)
		Thirty one isotopes and isomers of technetium, with atomic masses ranging from 86 to 113 are known.
		Technetium is a silver-gray metal that tarnishes slowly in moist air.
		It is reported that mild carbon steels may be effectively protected by as little as 55 ppm of KTcO4 in aerated distilled water at temperatures up to 250 deg C. This corrosion protection is limited to closed systems, since technetium is radioactive and must be confined.
	www.speclab.com /elements/technetium.htm (413 words)

	Technetium
		Designated technetium 99m, it has a half-life of 6 hours and is widely used in nuclear medicine for imaging procedures such as brain scans.
		Technetium - 99 is produced by bombarding molybdenum
		Mo decays with a half-life of 66 hours to a metastable state of Tc designated technetium-99m.
	hyperphysics.phy-astr.gsu.edu /hbase/pertab/Tc.html (73 words)

	The Element Technetium
		Technetium was discovered by Emilio Segre and Carlo Perrier in 1937 in Italy.
		Check out Technetium on the Periodic Table which arranges each chemical element according to its atomic number, as based on the periodic law, so that chemical elements with similar properties are in the same column.
		Our Periodic Table is simple to use - just click on the symbol for Technetium for additional information and for an instant comparison of the Atomic Weight, Melting Point, Boiling Point and Mass - G/cc with any other element.
	www.periodic-table.org.uk /element-technetium.htm (283 words)

	Technetium (Site not responding. Last check: 2007-10-14)
		It was found in a sample of molybdenum, which was bombarded by deuterons in the Berkeley cyclotron, and which E.
		The metal was first prepared by passing hydrogen gas at 1100 °C over Tc It is now conveniently prepared by the reduction of ammonium pertechnetate with hydrogen.
		Technetium dissolves in nitric acid, aqua regia, and concentrated sulfuric acid, but is not soluble in hydrochloric acid of any strength.
	www.sunysccc.edu /Academic/mst/ptable/Tc.html (415 words)

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