ORCID Profile
0000-0002-4258-9349
Current Organisation
University Of Strathclyde
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Publisher: Elsevier BV
Date: 11-2013
Publisher: Elsevier BV
Date: 11-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1EM00121C
Abstract: Strontium and caesium are fission products of concern at many nuclear legacy sites. In this study we used a novel approach to EXAFS spectra to determine the details of Cs and Sr surface complexation in clayey soils.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EN00046A
Abstract: Colloidal silica is a nanoparticulate material that could have a transformative effect on environmental risk management at nuclear legacy sites by preventing radioactive contamination through the in situ installation of injectable hydraulic barriers.
Publisher: Springer Science and Business Media LLC
Date: 10-07-2023
DOI: 10.1038/S41598-023-37822-6
Abstract: A novel method for precipitating hydroxyapatite (HAp) onto cement paste is investigated for protecting concrete infrastructure from radiological contamination. Legacy nuclear sites contain large volumes of contaminated concrete and are expensive and dangerous to decommission. One solution is to ‘design for decommissioning’ by confining contaminants to a thin layer. Current layering methods, including paints or films, offer poor durability over plant lifespans. Here, we present a mineral-HAp-coated cement, which innovatively serves as a barrier layer to radioactive contaminants (e.g. Sr, U). HAp is shown to directly mineralise onto a cement paste block in a layer several microns thick via a two-step process: first, applying a silica-based scaffold onto a cement paste block and second, soaking the resulting block in a PO 4 -enriched Ringer’s solution. Strontium ingression was tested on coated and uncoated cement paste (~ 40 × 40 × 40mm cement, 450 mL, 1000 mg L − 1 Sr) for a period of 1-week. While both coated and uncoated s les reduced the solution concentration of Sr by half, Sr was held within the HAp layer of coated cement paste and was not observed within the cement matrix. In the uncoated s les, Sr had penetrated further into the block. Further studies aim to characterise HAp before and after exposure to a range of radioactive contaminants and to develop a method for mechanical layer separation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1EM90022F
Abstract: Correction for ‘Emerging investigator series: a holistic approach to multicomponent EXAFS: Sr and Cs complexation in clayey soils’ by Pieter Bots et al. , Environ. Sci.: Processes Impacts , 2021, DOI: 10.1039/D1EM00121C.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Rebecca Lunn.