Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays
Mel O'Leary (Queen's University Belfast)
Daria Boscolo (GSI Helmholtzzentrum für Schwerionenforschung GmbH)
Nicole Breslin (Queen's University Belfast)
Jeremy M.C. Brown (Queen's University Belfast, TU Delft - RST/Applied Radiation & Isotopes)
Igor P. Dolbnya (Diamond Light Source)
Chris Emerson (Queen's University Belfast)
Catarina Figueira (Queen's University Belfast)
Oliver J.L. Fox (Diamond Light Source)
David Robert Grimes (University of Oxford, Queen's University Belfast)
Vladimir Ivosev (Queen's University Belfast, University Paris-Saclay)
Annette K. Kleppe (Diamond Light Source)
Aaron McCulloch (Queen's University Belfast)
Ian Pape (Diamond Light Source)
Chris Polin (Queen's University Belfast)
Nathan Wardlow (Queen's University Belfast)
Fred J. Currell (Queen's University Belfast)
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Abstract
Absolute measurements of the radiolytic yield of Fe3+ in a ferrous sulphate dosimeter formulation (6 mM Fe2+), with a 20 keV x-ray monoenergetic beam, are reported. Dose-rate suppression of the radiolytic yield was observed at dose rates lower than and different in nature to those previously reported with x-rays. We present evidence that this effect is most likely to be due to recombination of free radicals radiolytically produced from water. The method used to make these measurements is also new and it provides radiolytic yields which are directly traceable to the SI standards system. The data presented provides new and exacting tests of radiation chemistry codes.
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