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Issue 33, 2018, Issue in Progress
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Monitoring bromide effect on radiolytic yields using in situ observations of uranyl oxide precipitation in the electron microscope

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Abstract

During electron microscopy observations of uranium-bearing phases and solutions in a liquid cell, the electron beam induced radiolysis causes changes in the chemistry of the system. This could be useful for investigating accelerated alteration of UO2 and can be also used to monitor radiolytic effects. Low concentrations of bromide in aqueous solutions are known to reduce the generation rate of H2O2 during radiolysis and increase H2 production. We deduced the presence of radiolytic H2O2 by monitoring the formation of a uranyl peroxide solid from both solid UO2 and a solution of ammonium uranyl carbonate at neutral pH. Additionally, the effect of bromine on water radiolysis was investigated through chemical modelling and in situ electron microscopy. By measuring the contrast in the electron microscopy images it was possible to monitor H2O2 formation and diffusion from the irradiated zone in agreement with the models.

Graphical abstract: Monitoring bromide effect on radiolytic yields using in situ observations of uranyl oxide precipitation in the electron microscope

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Publication details

The article was received on 26 Feb 2018, accepted on 03 May 2018 and first published on 22 May 2018


Article type: Paper
DOI: 10.1039/C8RA01706A
Citation: RSC Adv., 2018,8, 18227-18233
  • Open access: Creative Commons BY license
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    Monitoring bromide effect on radiolytic yields using in situ observations of uranyl oxide precipitation in the electron microscope

    E. C. Buck, R. S. Wittman, Chuck. Z. Soderquist and B. K. McNamara, RSC Adv., 2018, 8, 18227
    DOI: 10.1039/C8RA01706A

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