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 M.C. Brown; Igor P. Dolbnya; Chris Emerson; Catarina Figueira; Oliver J.L. Fox; David Robert Grimes; Vladimir Ivosev; Annette K. Kleppe; Aaron McCulloch; Ian Pape; Chris Polin; Nathan Wardlow; Fred J. Currell

doi:10.1038/s41598-018-21813-z

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 M.C. Brown, Igor P. Dolbnya, Chris Emerson, Catarina Figueira, Oliver J.L. Fox, David Robert Grimes, Vladimir Ivosev, Annette K. Kleppe, Aaron McCulloch, Ian Pape, Chris Polin, Nathan Wardlow, Fred J. Currell

^*Corresponding author for this work

RST/Applied Radiation & Isotopes

Research output: Contribution to journal › Article › Scientific › peer-review

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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 language	English
Article number	4735
Journal	Scientific Reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-21813-z
Publication status	Published - 2018

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s41598-018-21813-z-1Final published version, 1.41 MBLicence: CC BY

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O'Leary, M., Boscolo, D., Breslin, N., Brown, J. M. C., Dolbnya, I. P., Emerson, C., Figueira, C., Fox, O. J. L., Grimes, D. R., Ivosev, V., Kleppe, A. K., McCulloch, A., Pape, I., Polin, C., Wardlow, N., & Currell, F. J. (2018). Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays. Scientific Reports, 8(1), Article 4735. https://doi.org/10.1038/s41598-018-21813-z

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

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.",

author = "Mel O'Leary and Daria Boscolo and Nicole Breslin and Brown, {Jeremy M.C.} and Dolbnya, {Igor P.} and Chris Emerson and Catarina Figueira and Fox, {Oliver J.L.} and Grimes, {David Robert} and Vladimir Ivosev and Kleppe, {Annette K.} and Aaron McCulloch and Ian Pape and Chris Polin and Nathan Wardlow and Currell, {Fred J.}",

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doi = "10.1038/s41598-018-21813-z",

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O'Leary, M, Boscolo, D, Breslin, N, Brown, JMC, Dolbnya, IP, Emerson, C, Figueira, C, Fox, OJL, Grimes, DR, Ivosev, V, Kleppe, AK, McCulloch, A, Pape, I, Polin, C, Wardlow, N & Currell, FJ 2018, 'Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays', Scientific Reports, vol. 8, no. 1, 4735. https://doi.org/10.1038/s41598-018-21813-z

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T1 - Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays

AU - O'Leary, Mel

AU - Boscolo, Daria

AU - Breslin, Nicole

AU - Brown, Jeremy M.C.

AU - Dolbnya, Igor P.

AU - Emerson, Chris

AU - Figueira, Catarina

AU - Fox, Oliver J.L.

AU - Grimes, David Robert

AU - Ivosev, Vladimir

AU - Kleppe, Annette K.

AU - McCulloch, Aaron

AU - Pape, Ian

AU - Polin, Chris

AU - Wardlow, Nathan

AU - Currell, Fred J.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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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JO - Scientific Reports

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ER -

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

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