Surface features on aged 238Pu-doped Eu-monazite
-
Andrey A. Shiryaev
,
Boris E. Burakov
Abstract
Several 238Pu-doped Eu monazite single crystals stored at ambient conditions are monitored for 15 years using Scanning and Transmission electron microscopy, spectroscopy, diffraction and optical microscopy. Despite preservation of high crystalline quality, mechanical cracking and formation of small flakes is observed. After several month of aging, a new phase appeared on surfaces of the crystals, which later formed a continuous shell of most crystallographic faces. Electron diffraction indicated that the shell consists of submicron Pu-containing rhabdophanes. Its formation likely occurs due to combined action of atmospheric moisture and recrystallisation of radiation damage in monazite domains adjacent to external and internal surfaces. Extent of the rhabdophane formation appears to be influenced by crystallography and Pu content of corresponding growth sectors of the parent monazite. Whereas macroscopic rhabdophanes and monazites are relatively stable against irradiation, formation of sub-microscopic particles is a point of concern for development of monazite-based ceramic forms for actinide immobilization.
Acknowledgements
The work was partly supported by RFBR grant 18-29-12032 and by CKP FMI IPCE RAS. We appreciate assistance of A. Averin, P. Mikhailova in analytical work and useful discussions with Drs. P. Kartashov and S. Britvin. Comments of two anonymous reviewers were helpful for clarification of some statements.
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©2020 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Cross sections and production yields of 117mSn and other radionuclides generated in natural and enriched antimony with protons up to 145 MeV
- Surface features on aged 238Pu-doped Eu-monazite
- Luminescence studies of uranyl-aliphatic dicarboxylic acid complexes in acetonitrile medium
- Equilibrium isotope effects of tritiated water in and over lithium chloride solution
- Interactions between hydro-soluble degradation products from a radio-oxidized polyesterurethane and Eu(III) in contexts of repositories for low and intermediate level radioactive waste
- Synthesis of radioiodinated carnosine for hepatotoxicity imaging induced by carbon tetrachloride and its biological assessment in rats
- Thermodynamic parameters for the complexation of Tc(IV) with bromide under aqueous conditions
- Measurement of L X-ray production cross sections and relative intensities of some lanthanide compounds depending on the temperature
Articles in the same Issue
- Frontmatter
- Cross sections and production yields of 117mSn and other radionuclides generated in natural and enriched antimony with protons up to 145 MeV
- Surface features on aged 238Pu-doped Eu-monazite
- Luminescence studies of uranyl-aliphatic dicarboxylic acid complexes in acetonitrile medium
- Equilibrium isotope effects of tritiated water in and over lithium chloride solution
- Interactions between hydro-soluble degradation products from a radio-oxidized polyesterurethane and Eu(III) in contexts of repositories for low and intermediate level radioactive waste
- Synthesis of radioiodinated carnosine for hepatotoxicity imaging induced by carbon tetrachloride and its biological assessment in rats
- Thermodynamic parameters for the complexation of Tc(IV) with bromide under aqueous conditions
- Measurement of L X-ray production cross sections and relative intensities of some lanthanide compounds depending on the temperature
