Apr 18 – 23, 2010
Casino Conference Centre
UTC timezone

Study of crystalline ceramics for immobilization of <sup>99</sup>Tc

Apr 22, 2010, 12:00 PM
1h 30m
Gallery (Casino Conference Centre)


Casino Conference Centre

Reitenbergerova 4/95, Marianske Lazne, Czech Republic
Board: NFC.P18
Poster Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management Poster Session - Chemistry of Nuclear Fuel Cycle, Nuclear Waste Management


Mrs Yulia Korneyko (V. G. Khlopin Radium Institute)


Technetium-99 is beta-active long-lived artificial radionuclide (half-life more than 200,000 years). Because of its long-life, high content in spent nuclear fuel, high ability to oxidize under aerobic conditions as ТсО4- Tc is one of the most dangerous radionuclides. Development of chemically durable host-phase for Tc disposal is important goal of research. There are no natural minerals of Tc, which might be considered as analogues of stable Tc host-phases. Some chemical elements such as manganese, titanium, rhenium can be used as Tc-simulants. They do not reflect however chemical behavior of Tc in detail. It was suggested to consider development of Tc host-phases with structures of spinel; pyrochlore; fluorite; garnet in three oxide systems: Fe-(Mn,Tc)-O, Zr-(Mn,Tc)-O, and (Sn,Tc)-O using different procedures of precursor preparation and ceramic synthesis conditions. Most samples were synthesized at 1150°C in inert atmosphere from precursors doped with 5-12 wt. % Tc. Some samples were obtained in air. All the samples obtained were studied using optical and scanning electron microscopy (SEM); powder X-ray diffraction (XRD); microprobe analysis (EMPA) and static leach test in distilled water at 90°C for 28 days. Content of Tc varied from 0.5-0.8 to 3-6 wt.% in oxide host phases and from 54 to 93 wt.% in metallic inclusions. Leach rates were less than 10-3 g/m2. Development of optimal methods of precursor preparation and synthesis conditions of Tc-doped ceramic are discussed.

Primary author

Mrs Yulia Korneyko (V. G. Khlopin Radium Institute)


Dr Boris Burakov (V. G. Khlopin Radium Institute) Dr Olga Schmidt (V. G. Khlopin Radium Institute) Mr Vladimir Garbuzov (V. G. Khlopin Radium Institute)

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