Radiation-induced preparation of uranium and thorium oxides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F15%3A00234972" target="_blank" >RIV/68407700:21340/15:00234972 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Radiation-induced preparation of uranium and thorium oxides

Popis výsledku v původním jazyce

Photo- and radiation-induced preparation of nanocrystalline uranium and/or thorium oxides and their subsequent pelletizing has been investigated. The preparative method was based on radiation- (UV radiation, accelerated electrons, gamma radiation) induced formation of amorphous precursors in aqueous solutions containing uranyl and/or thorium nitrate and ammonium formate. The prepared precursors were carbon free, thus allowing direct heat treatment in reducing atmosphere without pre-treatment in the air.Subsequent heat treatment of amorphous solid precursors at 300?700 °C yielded UO2, ThO2 or solid (Th,U)O2 solutions with high purity and linear crystallite size of 3?51 nm. The prepared oxides were pelletized without any binder (pressure 500 MPa), the green pellets were subsequently sintered at 1300 °C under a 20Ar:1H2 mixture (UO2 and (Th,U)O2 pellets) or at 1600 °C in ambient air (ThO2 pellets). The theoretical density of the sintered pellets varied from 90 to 97 %. Therefore, the pho

Název v anglickém jazyce

Radiation-induced preparation of uranium and thorium oxides

Popis výsledku anglicky

Photo- and radiation-induced preparation of nanocrystalline uranium and/or thorium oxides and their subsequent pelletizing has been investigated. The preparative method was based on radiation- (UV radiation, accelerated electrons, gamma radiation) induced formation of amorphous precursors in aqueous solutions containing uranyl and/or thorium nitrate and ammonium formate. The prepared precursors were carbon free, thus allowing direct heat treatment in reducing atmosphere without pre-treatment in the air.Subsequent heat treatment of amorphous solid precursors at 300?700 °C yielded UO2, ThO2 or solid (Th,U)O2 solutions with high purity and linear crystallite size of 3?51 nm. The prepared oxides were pelletized without any binder (pressure 500 MPa), the green pellets were subsequently sintered at 1300 °C under a 20Ar:1H2 mixture (UO2 and (Th,U)O2 pellets) or at 1600 °C in ambient air (ThO2 pellets). The theoretical density of the sintered pellets varied from 90 to 97 %. Therefore, the pho

Druh

O - Ostatní výsledky

CEP obor

CH - Jaderná a kvantová chemie, fotochemie

OECD FORD obor

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Projekt

<a href="/cs/project/7G12092" target="_blank" >7G12092: Advanced fuelS for Generation IV reActors: Reprocessing and Dissolution</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů