Gamma radiation-induced defects in KCl, MgCl2, and ZnCl2 salts at room temperature

Ramos-Ballesteros, Alejandro; Gakhar, Ruchi; Horne, Gregory P.; Iwamatsu, Kazuhiro; Wishart, James F.; Pimblott, Simon M.; LaVerne, Jay A.

doi:10.1039/d1cp00520k

Gamma radiation-induced defects in KCl, MgCl₂, and ZnCl₂ salts at room temperature

Journal Article · Fri Apr 23 00:00:00 EDT 2021 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/d1cp00520k· OSTI ID:1785948

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Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL)
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States). Center for Radiation Chemistry
Brookhaven National Lab. (BNL), Upton, NY (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States). Nuclear Science User Facilities
Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL); Univ. of Notre Dame, IN (United States)

Room temperature post-irradiation measurements of diffuse reflectance and electron paramagnetic resonance spectroscopies were made to characterize the long-lived radiation-induced species formed from the gamma irradiation of solid KCl, MgCl₂, and ZnCl₂ salts up to 100 kGy. The method used showed results consistent with those reported for electron and gamma irradiation of KCl in single crystals. Thermal bleaching of irradiated KCl demonstrated accelerated disaggregation of defect clusters above 400 K, due to decomposition of Cl₃^-. The defects formed in irradiated MgCl₂ comprised a mixture of Cl₃^-, F-centers, and Mg⁺ associated as M-centers. Further, Mg metal cluster formation was also observed at 100 kGy, in addition to accelerated destruction of F-centers above 20 kGy. Irradiated ZnCl₂ afforded the formation of Cl₂^- due to its high ionization potential and crystalline structure, which decreases recombination. The presence of aggregates in all cases indicates the high diffusion of radicals and the predominance of secondary processes at 295 K. Additionally, thermal bleaching studies showed that chloride aggregates’ stability increases with the ionization potential of the cation present. The characterization of long-lived radiolytic transients of pure salts provides important information for the understanding of complex salt mixtures under the action of gamma radiation.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC07-05ID14517; FC02-04ER15533

OSTI ID:: 1785948

Alternate ID(s):: OSTI ID: 1780104

Report Number(s):: BNL--221591-2021-JAAM

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 17 Vol. 23; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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