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Topic: Actinium

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Protactinium

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	actinium. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Actinium is a silver-white metal with a cubic crystalline structure.
		Actinium is in group IIIb of the periodic table.
		Actinium was first recognized in 1899 by André Debierne in uranium residues from pitchblende after the radium was extracted by Pierre and Marie Curie.
	www.bartleby.com /65/ac/actinium.html (243 words)

	Actinium - (Ac) - Chemical properties, Health and environmental effects
		The chemical behavior of actinium is similar to that of the rare earth lanthanum.
		Actinium is found in trace amounts in uranium ore, but more commonly is made in milligram amounts by the neutron irradiation of 226-Ra in a nuclear reactor.
		Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300-degrees C. Naturally occurring actinium is composed of 1 radioactive isotope; with 227-Ac being the most abundant (100% natural abundance).
	www.lenntech.com /Periodic-chart-elements/Ac-en.htm (594 words)

	C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - ACTINIUM
		Actinium is a silvery white metal having a face-centered cubic crystal structure.
		In 1906, it was concluded that Giesel's emanium was identical to Debierne's actinium.
		Upon exposure to actinium, the human body accumulates actinium in the superficial layers of the bone structure of the skeleton, where it is tenaciously retained.
	pubs.acs.org /cen/80th/print/actiniumprint.html (730 words)

	Actinium (Ac) (Site not responding. Last check: 2007-10-03)
		Actinium is a radioactive metallic element that is found in all uranium ores (2 parts actinium to every 10 billion parts uranium).
		They are actinium-227 (called the actinium decay series) which results from the radioactive decay of uranium-235 and actinium-228 which results from the decay of thorium-232.
		The chemical properties of actinium are similar to that of other rare earths, especially lanthanum.
	www.bayerus.com /msms/fun/pages/periodic/actinium/index.html (74 words)

	Actinium: Free Encyclopedia Articles at Questia.com Online Library
		Actinium was first recognized in 1899 by AndrU+00E9 Debierne in uranium residues from pitchblende after the radium was extracted by Pierre and Marie Curie.
		Actinium is a silver-white metal with a cubic crystalline structure...fluoride with lithium vapor at about 1,200 degrees Celsius.
		Actinium and protactinium are found in nature...that all members of the series resemble actinium and each other in their chemical properties...
	www.questia.com /library/encyclopedia/actinium.jsp?l=A&p=1 (896 words)

	Actinium (Site not responding. Last check: 2007-10-03)
		Actinium, discovered in 1899, is the second rarest of the elements.
		Actinium is obtained as an "impurity" in the pitchblende that is mined for its uranium content.
		Shown above is a minute quantity (approximately 40 mg) of actinium oxide sealed in a radiaton-resistent quartz tube.
	nobel.scas.bcit.ca /resource/ptable/ac.htm (87 words)

	Actinium: Chemical Elements
		Actinium is the third element in Row 7 of the periodic table, a chart that shows how the chemical elements are related to each other.
		Actinium has chemical properties like those of lanthanum (number 57), the element just above it in the periodic table.
		Actinium is also similar to radium, the element just before it (number 88) in Row 7.
	science.enotes.com /chemical-elements/Actinium (166 words)

	Actinium (Site not responding. Last check: 2007-10-03)
		Actinium is found in uranium ores in nature but in very small quantities so it is difficult to detect.
		The actinium 3+ ion is the largest and most basic of the 3+ ions and resist hydrolysis to an unusual extent.
		Actinium is a powerful source of alpha-rays, consisting of positively charged particles emitted during certain radioactive changes.
	lakeview.esu7.org /science/ac.htm (330 words)

	Actinium (Element)
		Actinium was discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902.
		Actinium is a very powerful source of alpha rays and is dangerously radioactive.
		It is found naturally in uranium ores and actinium is 150 times more radioactive than radium.
	www.tamuk.edu /chemistry/WebElements/actinium_element.htm (44 words)

	ACTINIUM, Ac - Periodic System of Elements
		Actinium is a radioactive element from the Actinides period which was discovered in 1899., one year after the discovery of Polonium, by A. Debierne in a residue of uranium oxide.
		The most common isotope of Actinium is 227 Ac which mostly occurs as a product of decay of 235U (also known as actiuranium) in concentrations of 0.715%.
		Pure actinium comes into balance with the products of its own decay after 18 days and represents a powerful source of a-rays.
	www.pse.pbf.hr /engleski/elementi/ac (192 words)

	It's Elemental - The Element Actinium
		Actinium was discovered in 1899 by André-Louis Debierne, a French chemist, while experimenting with new methods of separating rare earth oxides.
		Actinium is a rare element that is present in uranium ores in tiny amounts, but it is usually cheaper and easier to create actinium when it is needed by bombarding radium with neutrons in a nuclear reactor.
		Actinium's most stable isotope, actinium-227, has a half-life of 21.77 years.
	education.jlab.org /itselemental/ele089.html (115 words)

	89 Actinium
		Actinium is a rare, extremely radioactive metal that glows in the dark with an eerie blue light.
		Later was showed that it was identical with Actinium, and since Debierne was earlier, his chosen name took priority.
		The genetic relationships of the members of the Actinium decay series were determined during the next twenty years by radiochemical studies.
	www.vanderkrogt.net /elements/elem/ac.html (295 words)

	actinium - What is definition of the term - actinium ? (Site not responding. Last check: 2007-10-03)
		Due to its intense radioactivity, Actinium glows in the dark with an eerie blue light.
		It is found only in traces in uranium ores as 227-Ac, an α and β emitter with a half-life of 21.773 years.
		Actinium-225 is used in medicine to produce Bi-213 in a reusable generator or can be used alone as an agent for radio-immunotherapy.
	www.linguasphere.org /dictionary/n-673-actinium.html (301 words)

	Actinium - Search Results - ninemsn Encarta
		Actinium, symbol Ac, radioactive metallic element found in all uranium ores.
		The atomic number of actinium is 89; the element is in the...
		Francium, symbol Fr, radioactive metallic element that closely resembles caesium in chemical properties.
	au.encarta.msn.com /Actinium.html (88 words)

	Michael Swanwick's Periodic Table of Science Fiction
		The average lifetime of an actinium atom is thirty-three years.
		Actinium is intensely radioactive—so radioactive that it excites the air about it, and glows in the dark.
		The Sherlock and the Watson floated alongside the offloaded actinium waiting for a lighter to arrive and recover the stolen merchandise.
	www.scifi.com /scifiction/elements/actinium.html (384 words)

	Actinium
		Actinium occurs naturally in association with uranium minerals.
		Actinium metal can be prepared by the reduction of actinium fluoride with lithium vapour at approximately 1100-1300°C. Applications
		Actinium is approximately 150 times as active as radium, therefore making it of value in the production of neutrons.
	www.azom.com /details.asp?ArticleID=573 (146 words)

	The Element Actinium
		Actinium was discovered by Andre-Louis Debierne in France in 1899.
		Actinium is found in trace amounts in uranium ore
		Check out Actinium 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.
	www.periodic-table.org.uk /element-actinium.htm (294 words)

	Actinium Pharmaceuticals (Site not responding. Last check: 2007-10-03)
		Because of the optimal therapeutic results, the absence of clinical side effects, and the significantly lower cost of treatment, APIT is poised to provide patients with a powerful cancer treatment that overcomes the most significant problems and limitations of current therapies.
		Actinium Pharmaceuticals' success is based on its ability to combine key resources necessary for the development and commercialization of Alpha Particle Immunotherapy, through its unique expertise, intellectual property, and strategic partnerships.
		As Actinium Pharmaceuticals continues to expand its R&D into different types of cancer, we welcome your interest in this new science, as well as your active participation in the company's endeavor to find a true breakthrough in the tratment of cancer.
	www.actiniumpharmaceuticals.com /home.htm (177 words)

	actinium - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-03)
		actinium [Gr.,=like a ray], radioactive chemical element; symbol Ac; at.
		Actinium is in Group 3 of the periodic table.
		Actinium Pharmaceuticals Announces Collaboration with Memorial Sloan Kettering Cancer Center for a Novel Targeted Cancer Immunotherapy.
	www.encyclopedia.com /doc/1E1-actinium.html (636 words)

	Chemistry : Periodic Table : francium : key information
		Francium occurs as a result of α disintegration of actinium.
		Actinium decays by β decay most of the time but about 1% of the decay is by α decay.
		Fr - the longest-lived isotope of actinium with a half life of about 22 minutes.
	www.webelements.com /webelements/elements/text/Fr/key.html (272 words)

	CRCPress Periodic Table Online: Cadmium
		In equilibrium with its decay products, it is a powerful source of alpha rays.
		Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300°C. The chemical behavior of actinium is similar to that of the rare earths, particularly lanthanum.
		Purified actinium comes into equilibrium with its decay products at the end of 185 days, and then decays according to its 21.77-year half-life.
	www.chemnetbase.com /periodic_table/elements/actinium.htm (176 words)

	Actinium
		Actinium was discovered in 1899 by Andre-Louis Debierne.
		The word comes from the Greek aktis, "ray." Actinium is found with uranium minerals in pitchblende (approximately 0.15 mg actinium per ton of pitchblende).
		Actinium is dangerously radioactive-- it is 150 times more radioactive than radium!
	www.chemistry.pomona.edu /Chemistry/periodic_table/Elements/Actinium/actinium.htm (304 words)

	Amazon.com: actinium (Site not responding. Last check: 2007-10-03)
		The radiochemistry of the rare earths: scandium, yttrium, and actinium, (National Research Council.
		Radium, and other radio-active substances;: Polonium, actinium, and thorium, with a consideration of phosphorescent and fluorescent substances, the properties...
		Radium and Other Radio-Active Substances: Polonium, Actinium and Thorium with a Consideration of Phosphorescent and Fluorescent by William J. Hammer and Contains 38 illustrations.
	www.amazon.com /s?ie=UTF8&keywords=actinium&tag=lexico&index=blended&link_code=qs&page=1 (350 words)

	Chemistry : Periodic Table : actinium : key information
		The chemical behaviour of actinium is similar to that of the rare earths, particularly lanthanum.
		Here is a brief summary of the isolation of actinium.
		Copyright 1993-2007 Mark Winter [The University of Sheffield and WebElements Ltd, UK].
	www.webelements.com /webelements/elements/text/Ac/key.html (123 words)

	Ac - Actinium
		In equilibrium with its decay products, it is a powerfulsource of alpha rays.
		Actinium metal has been prepared by the reduction of actiniumfluoride with lithium vapor at about 1100 to 1300-degrees C. The chemical behavior ofactinium is similar to that of the rare earths, particularly lanthanum.
		Purified actiniumcomes into equilibrium with its decay products at the end of 185 days, and then decaysaccording to its 21.6-year half-life.
	www.physlink.com /Reference/ChemicalElements/actinium.cfm (137 words)

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