MRS2017 - Scientific Basis for Nuclear Waste Management Symposium 2017

Session

Special topic on Tc and Re

2 Nov 2017, 16:00

88. Comparison of thermal expansion of Tc and Re salts.

Prof. Gordon Thorogood (ANSTO)

02/11/2017, 16:00

National and international collaborative waste management programs

Oral Presentation

99Tc is the most significant long-lived product of uranium fission, producing the largest fraction of the total long-lived radiation emissions of nuclear waste. Tc 7+ compounds are highly mobile in the environment. Relatively little is known regarding the solid state chemistry of Tc. Recently we studied the structural properties of (NH4)TcO4 (Tc7+) and confirmed that this is isostructural...

111. Alkali technetium oxides and their relation to Tc loading in nuclear waste glasses

Prof. John McCloy (Washington State University)

02/11/2017, 16:15

Oral Presentation

Because of their radioactive nature, solid technetium-99 oxides have been rarely studied, and there is a dearth of modern spectra and diffraction patterns in the literature. This publication aims to address this by detailing a low-temperature synthesis method for pure, crystalline alkali pertechnetates, along with complete analysis by static and magic-angle-spinning nuclear magnetic...

113. Tc reduction by bacteria from soda lake

Prof. Konstantin German (A.N.Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences)

02/11/2017, 16:30

Oral Presentation

One of the problematic types of LRW are alkaline wastes generated in some types of spent nuclear fuel reprocessing. Environmental friendly biological techniques of LRW treatment are not widespread because of its extremely high salt contents and alkalinity usually not suitable for organisms. The aim of this work was to explore the use of microorganisms from extremely alkaline habitat to...

114. Unusual redox neighborhood in technetium compounds

Prof. Konstantin German (A.N.Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences)

02/11/2017, 16:45

Oral Presentation

Techetium has a great number of oxidation states (usually we say 9 but in fact much more) and is evidently one of the elements with the most complicated chemistry. This is due its position in the center of 4d elements row with 7 electrones available for chemical bonding. One of the very special options complicating technetium chemistry is its ability to cluster formation and especially the...