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SO3- radicals for EPR dosimetry: X- and Q band EPRstudy and LET dependency of crystalline potassium dithionate
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Center for Diagnostics, Department of Biomedical Engineering.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Department of Physics, University of Oslo, Norway.
Department of Physics, University of Oslo, Norway.
2013 (English)In: Radiation Measurements, ISSN 1350-4487, Vol. 59, 123-128 p.Article in journal (Refereed) Published
Abstract [en]

The structures of the free radicals formed by the irradiation of potassium dithionate (K 2S2O6) with 60Co g -rays and 14N7þ ions were investigated by EPR to further examine a recently proposed LET effect in this material. Two types of SO 3 radical ions were identified in X-irradiated single crystals by measurements at X- and Q bands. One of these (S1) exhibited 33S hyperfine couplings At ¼ 12.49, Ajj ¼ 15.60 mT, the other (S2) A t ¼ 11.29, Ajj ¼ 13.92 mT. The g-factors were nearly isotropic, gt ¼ 2.0010, gjj ¼ 2.0003; and g t ¼ 2.0026, gjj ¼ 2.0008, respectively. The 33S hyperfine coupling tensors and g-tensors were axially symmetric about the trigonal <c>-axis, coinciding with the direction of the SeS bonds of the two nonequivalent S 2O2 6 ions in the crystal. A model for the radiation damage was proposed in which the SO 3 radical ions retain the orientation of the SO 3 groups, aligned along the trigonal axis. The structure of a third main radical species (S3) with gt ¼ 2.0026, gjj ¼ 2.0052 could not be unambiguously assigned, due to undetected 33S features. The relative integrated intensities of S1, S2 and S3 depended on the radiation quality and were approximately estimated as 0.18: 0.65:0.17 for 60Co g-rays and 0.47: 0.38: 0.15 for 14N7þ ions. Additional weak lines on the low field side of the main signal were tentatively attributed to SO 2 radical ions. An even weaker strongly anisotropic pair of lines was attributed to SO 3 radical pairs separated by 0.93 e0.95 nm along the trigonal axis.

Place, publisher, year, edition, pages
Pergamon Press, 2013. Vol. 59, 123-128 p.
Keyword [en]
Potassium dithionate, EPR dosimetry, radical ions, Linear energy transfer (LET)
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-105065DOI: 10.1016/j.radmeas.2013.05.001OAI: diva2:703413
Available from: 2014-03-06 Created: 2014-03-06 Last updated: 2014-03-19Bibliographically approved

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Gustafsson, HåkanLund, Anders
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Radiation PhysicsFaculty of Health SciencesDepartment of Biomedical EngineeringDepartment of Physics, Chemistry and BiologyThe Institute of Technology
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