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Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays

DOI: 10.1038/s41598-018-21813-z DOI Help

Authors: Mel O'leary (Queen's University of Belfast) , Daria Boscolo (GSI Helmholtzzentrum für Schwerionenforschung GmbH) , Nicole Breslin (Queen's University of Belfast) , Jeremy M. C. Brown (Queen's University of Belfast) , Igor P. Dolbnya (Diamond Light Source) , Chris Emerson (Queen's University of Belfast) , Catarina Figueira (Queen's University of Belfast) , Oliver J. L. Fox (Diamond Light Source) , David Robert Grimes (Queen’s University Belfast; Cancer Research UK/MRC Oxford Institute for Radiation Oncology, University of Oxford) , Vladimir Ivosev (Queen’s University Belfast; Université Paris Sud) , Annette K. Kleppe (Diamond Light Source) , Aaron Mcculloch (Queen's University of Belfast) , Ian Pape (Diamond Light Source) , Chris Polin (Queen's University of Belfast) , Nathan Wardlow (Queen's University of Belfast) , Fred J. Currell (Queen’s University Belfast)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 8

State: Published (Approved)
Published: March 2018
Diamond Proposal Number(s): 11529 , 10228

Open Access Open Access

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.

Journal Keywords: Chemical physics; Colloids; Fluids

Subject Areas: Physics


Instruments: B16-Test Beamline , I15-Extreme Conditions

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s41598-018-21813-z.pdf

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