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New Preparative Approach to Purer Technetium-99 Samples-Tetramethylammonium Pertechnetate: Deep Understanding and Application of Crystal Structure, Solubility, and Its Conversion to Technetium Zero Valent Matrix.
Int J Mol Sci
January 2023
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Bldg 4, Leninsky Prosp., Moscow 119071, Russia.
Tc is one of the predominant fission products of U and an important component of nuclear industry wastes. The long half-life and specific activity of Tc (212,000 y, 0.63 GBq g) makes Tc a hazardous material.
View Article and Find Full Text PDFPressure and high-Tc superconductivity in sulfur hydrides.
Sci Rep
May 2016
Lawrence Berkeley Laboratory, University of California, 1 Cyclotron Road, Berkeley, CA 94720, USA.
The paper discusses fundamentals of record-TC superconductivity discovered under high pressure in sulfur hydride. The rapid increase of TC with pressure in the vicinity of Pcr ≈ 123GPa is interpreted as the fingerprint of a first-order structural transition. Based on the cubic symmetry of the high-TC phase, it is argued that the lower-TC phase has a different periodicity, possibly related to an instability with a commensurate structural vector.
View Article and Find Full Text PDFFractionated elution using the TEKCIS technetium-99m generator.
Nucl Med Commun
June 2016
Departments of aNuclear Medicine bPharmacy cUMR 1086 INSERM-UCBN, CHU de Caen dEA 4650 University of Caen-Basse Normandy, Caen F-14000, France.
The TEKCIS technetium-99m (Tc) generator was designed to allow dry column shipment and automatized conception. A high Tc radioactive concentration is required in a subset of radiopharmacy procedures. Fractionated elution can be a useful tool to meet this requirement, especially when current elution is close to the generator expiration date.
View Article and Find Full Text PDFConventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system.
Nature
September 2015
Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Staudingerweg 9, 55099 Mainz, Germany.
A superconductor is a material that can conduct electricity without resistance below a superconducting transition temperature, Tc. The highest Tc that has been achieved to date is in the copper oxide system: 133 kelvin at ambient pressure and 164 kelvin at high pressures. As the nature of superconductivity in these materials is still not fully understood (they are not conventional superconductors), the prospects for achieving still higher transition temperatures by this route are not clear.
View Article and Find Full Text PDFAn almost completed pollution-recovery cycle reflected by sediment geochemistry and benthic foraminiferal assemblages in a Swedish-Norwegian Skagerrak fjord.
Mar Pollut Bull
June 2015
Department of Earth Sciences, University of Gothenburg, P.O. Box 460, SE 40530, Sweden.
During the 20th century Idefjord was considered one of the most polluted marine areas in Scandinavia. For decades it received high discharges from paper/pulp industry, which made it anoxic and extremely polluted by heavy metals and organic contaminants. Today the fjord is close to fulfil a complete pollution-recovery cycle, which is recorded in its sediment archives.
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