Results 241 to 250 of about 97,761 (300)
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Journal of Inorganic and Nuclear Chemistry, 1964
Abstract A sample of African pitchblende was found to contain between 2·5–3·1 × 10−10 g of 99Tc per kilogram ore, but no other technetium isotopes were detected. The 99Tc/238U ratio in pitchblende was about the same as the 99Mo/238U ration in nonirradiated uranium. The experimental results suggest that the 99Tc is produced in the ore predominantly by
B.T. Kenna, P.K. Kuroda
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Abstract A sample of African pitchblende was found to contain between 2·5–3·1 × 10−10 g of 99Tc per kilogram ore, but no other technetium isotopes were detected. The 99Tc/238U ratio in pitchblende was about the same as the 99Mo/238U ration in nonirradiated uranium. The experimental results suggest that the 99Tc is produced in the ore predominantly by
B.T. Kenna, P.K. Kuroda
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Solar Neutrino Production of Technetium-97 and Technetium-98
Science, 1982It may be possible to determine the boron-8 solar neutrino flux, averaged over the past several million years, from the concentration of technetium-98 in molybdenite. The mass spectrometry of this system is greatly simplified by the absence of stable technetium isotopes, and the presence of the fission product technetium-99 provides a monitor of ...
G. A. Cowan, Wick Haxton
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The composition and structure of technetium nitride and technetium borides
Journal of the Less Common Metals, 1964Analysis of Tc heated in nitrogen in the temperature range 400 -900 deg C revealed no change in the lattice constants of the metal. When heated in ammonia in the range 7001100 deg C, lattice constants increased to an extent depending on the amount of nitrogen absorbed.
W. Trzebiatowski, J. Rudzinski
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Publications of the Astronomical Society of the Pacific, 1977
Lines of Tc I have heen identified in the Me variahle T Cep. The presence of technetium in other Me variahles is discussed in view of a correlation hetween the degree of heavy-metal line enhancement in long-period variahles and the velocity displacement hetween emission and ahsorption lines.
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Lines of Tc I have heen identified in the Me variahle T Cep. The presence of technetium in other Me variahles is discussed in view of a correlation hetween the degree of heavy-metal line enhancement in long-period variahles and the velocity displacement hetween emission and ahsorption lines.
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Technetium, the missing element
European Journal of Nuclear Medicine, 1996The history of the discovery of technetium is reviewed within the framework of the discovery and production of artificial radioactivity in the twentieth century. Important elements of this history are the accidental production of this element in a cyclotron in Berkeley, California, USA, a machine devised by Ernest Orlando Lawrence, and its subsequent ...
Ernest K. J. Pauwels +1 more
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1975
These two metals are less well known than many other of the second- and third-row transition metals, although interest in rhenium chemistry has recently increased. Technetium, as its name suggests, is an artifically produced element, the only such among all the d transition metals.
S. A. Cotton, F. A. Hart
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These two metals are less well known than many other of the second- and third-row transition metals, although interest in rhenium chemistry has recently increased. Technetium, as its name suggests, is an artifically produced element, the only such among all the d transition metals.
S. A. Cotton, F. A. Hart
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ChemInform, 2005
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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Technetium Complexes with Triazacyclononane
Inorganic Chemistry, 2006[NBu4][TcOCl4] reacts with ethylene glycol and 1,4,7-triazacyclononane (tacn) in MeOH under the formation of the deep-blue oxotechnetium(V) cation [TcO(OC2H4O)(tacn)]+, which can readily be oxidized by air to give the stable technetium(VII) compound [TcO3(tacn)]+.
Ulrich Abram, Henrik Braband
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International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1986
The chemistry of the technetium-sulfur colloid produced by the reaction of sodium thiosulfate with acid was investigated. A commercial kit was duplicated, and analyses of elemental sulfur, bisulfite and residual thiosulfate were carried out. The colloidal dispersions were filtered through Nuclepore graded membranes, and the percentages of sulfur and of
Joseph Steigman +2 more
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The chemistry of the technetium-sulfur colloid produced by the reaction of sodium thiosulfate with acid was investigated. A commercial kit was duplicated, and analyses of elemental sulfur, bisulfite and residual thiosulfate were carried out. The colloidal dispersions were filtered through Nuclepore graded membranes, and the percentages of sulfur and of
Joseph Steigman +2 more
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Manganese, Technetium and Rhenium
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
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