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

Mel O'Leary, Daria Boscolo, Nicole Breslin, Jeremy Brown, Igor P. Dolbnya, Christopher Emerson, Catarina Figueira, Oliver J. L. Fox, D R Crimes, Vladimir Ivosev, Annette K. Kleppe, Aaron McCulloch, Ian Pape, Chris Polin, Nathan Wardlow, Frederick Currell

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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.
Original languageEnglish
Article number4735
Pages (from-to)1-9
JournalScientific Reports
Volume8
DOIs
Publication statusPublished - 16 Mar 2018

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