RadChem 2010

Session

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management 2

NFC2

20 Apr 2010, 08:00

Casino Conference Centre

144. Micro-scale investigations of U(VI) immobilization by cementitious materials

Dr Erich Wieland (Paul Scherrer Institute)

20/04/2010, 08:00

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

Cement-based materials play an important role in multi-barrier concepts developed worldwide for the safe disposal of low- and intermediate-level radioactive waste. Cement is used to condition the waste materials and for the construction of the engineered barrier system (container, backfill and liner materials) in deep geological repositories. The cementitious near field is subject to chemical...

60. Sorption of Ni and Eu in a multi-element system

Mr Fidelis Sameh Ebong (Loughborough University)

20/04/2010, 08:30

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

At present the immobilisation of High Level Waste (HLW) in vitreous matrices followed by their burial in deep geological repository systems, composed of natural and engineered barriers to isolate the long lived radionuclides from the biosphere is the most preferred procedure. Granitic rock formations are being considered as host rocks for such geological repositories1. The study of the...

63. Sorption of Tc(IV) to geologic materials associated with a geological disposal facility

Mr Ricky Hallam (Loughborough University)

20/04/2010, 08:50

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

Technetium-99 is one of the most important isotopes likely to be disposed of in the proposed UK Geological Disposal Facility (GDF) for higher-activity radioactive wastes. This is due to its long half life (2.13 x 105 y), fission yield (6%), and its ability to migrate through soils and other environmental components when in its oxidised, pertechnetate, TcO4- form. However, much of the...

71. Effect of Ca²⁺ on the sorption of uranium(VI) and humic acid on natural clay

Ms Claudia Joseph (Forschungszentrum Dresden-Rossendorf, Institute of Radiochemistry)

20/04/2010, 09:10

Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management

Verbal

In various countries clay is discussed as possible host rock for a nuclear waste repository. The interaction of the clay with actinides, especially U(VI), is the focus of our work. Sorption experiments were performed to estimate the actinide migration in clay formations. Also the influence of humic acid (HA) is investigated. HA are ubiquitously found in natural environments and can interact...