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

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 reporte...

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Detalles Bibliográficos
Autores principales: O’Leary, Mel, Boscolo, Daria, Breslin, Nicole, Brown, Jeremy M. C., Dolbnya, Igor P., Emerson, Chris, Figueira, Catarina, Fox, Oliver J. L., Grimes, David Robert, Ivosev, Vladimir, Kleppe, Annette K., McCulloch, Aaron, Pape, Ian, Polin, Chris, Wardlow, Nathan, Currell, Fred J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5856745/
https://www.ncbi.nlm.nih.gov/pubmed/29549265
http://dx.doi.org/10.1038/s41598-018-21813-z
Descripción
Sumario: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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