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Microstructure of Aged 238Pu-doped La-monazite Ceramic and Peculiarities of its X-ray Emission Spectra

Published online by Cambridge University Press:  27 January 2020

Andrey A. Shiryaev ,
Boris E. Burakov ,
Vasily O. Yapaskurt ,
Alexander V. Egorov  and
Irina E. Vlasova
Andrey A. Shiryaev*
Affiliation:
Institute of physical chemistry and electrochemistry RAS, Leninsky pr. 31, korp. 4, 119071, Moscow, Russia (shiryaev@phyche.ac.ru) Department of Chemistry, Lomonosov Moscow State University, Leninskie gory, 1 bld.3, Moscow, 119991, Russia
Boris E. Burakov
Affiliation:
V. G. Khlopin Radium institute, 2-nd Murinski ave. 28, Sankt-Petersburg, 194021, Russia.
Vasily O. Yapaskurt
Affiliation:
Department of Geology, Lomonosov Moscow State University, Moscow, 119991, Russia
Alexander V. Egorov
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Leninskie gory, 1 bld.3, Moscow, 119991, Russia
Irina E. Vlasova
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Leninskie gory, 1 bld.3, Moscow, 119991, Russia
*
*(Email: a_shiryaev@mail.ru)
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Abstract

New data on microstructure of 16 years old (La, Pu)PO4 monazite ceramics doped with 8.1 wt% of 238Pu are presented. It is shown that the sample consists from at least two phases differing in La/Pu ratio and small precipitates of Pu-phosphate. Possible mechanisms of the compositional heterogeneity are discussed. Formation of Pu-containing rhabdophane after sample storage in air is observed. This phenomenon together with gradual mechanical destruction of the ceramic pellet formation of submicron particles will likely increase rate of radionuclides loss from the monazite-based waste form. X-ray emission lines produced by recoil uranium ions from Pu decay are analysed. It is suggested that careful examination of their relative intensities may provide important information about behaviour of "hot" recoils in nuclear waste forms.

Keywords

actinidewaste management
Type
Articles
Information
MRS Advances , Volume 5 , Issue 1-2: Scientific Basis for Nuclear Waste Management XLIII , 2020 , pp. 1 - 7
Copyright
Copyright © Materials Research Society 2020

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