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Small-field dosimetry based on reduced graphene oxide under MeV helium beam irradiation
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SYSNO ASEP 0523740 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Small-field dosimetry based on reduced graphene oxide under MeV helium beam irradiation Author(s) Torrisi, L. (IT)
Cutroneo, Mariapompea (UJF-V) ORCID, RID, SAI
Torrisi, Alfio (UJF-V) RID, ORCID
Silipigni, L. (IT)
Havránek, Vladimír (UJF-V) RID, SAI, ORCIDNumber of authors 5 Source Title Radiation Effects and Defects in Solids. - : Taylor & Francis - ISSN 1042-0150
Roč. 175, 1-2 (2020), s. 120-135Number of pages 16 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords dosimeter ; reduced graphene oxide ; helium ion beam ; Gy dose Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders OECD category Nuclear physics R&D Projects LM2015056 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GBP108/12/G108 GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UJF-V - RVO:61389005 UT WOS 000517368700012 EID SCOPUS 85081032007 DOI 10.1080/10420150.2020.1718137 Annotation A new type of ion dosimeter based on graphene oxide (GO) foils is presented and discussed. GO is biocompatible, stable, tissue equivalent and has special chemical and physical properties. The ion irradiation reduces the material thanks to the breaking of oxygen functional groups bonded to the carbon matrix and to the consequent their desorption. The reduction effect increases the carbon-to-oxygen atomic ratio and transforms the pristine insulator GO into the semiconductive reduced GO (rGO). The reduction increases with the ion dose making the material more electrically conductive, decreasing its band gap and making it denser. At high doses of 2 MeV helium beam irradiation, the electrical conductivity increases linearly with the ion fluence for values within 10(11) and 5 x 10(14) ions/cm(2), corresponding to absorbed doses of 25.9 kGy and 129.55 MGy, respectively. The results indicate that this material reduction is controllable through the desorption of oxygen groups and absorbed hydrogen, by the increment of the electrical conductivity and by the surface roughness, all these parameters depending on the absorbed dose by the material, which can be a good candidate to realise small ion dosimeters, especially to be used in the small-field dosimetry. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2021 Electronic address https://doi.org/10.1080/10420150.2020.1718137
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