Chemical dosimetry in the „Water Window“: ferric ions and hydroxyl radicals produced by intense soft X rays

0531919 - FZÚ 2021 RIV US eng J - Journal Article
Vyšín, Luděk - Wachulak, P. - Toufarová, Martina - Medvedev, Nikita - Voronkov, R. A. - Bartnik, A. - Fiedorowicz, H. - Juha, Libor
Chemical dosimetry in the „Water Window“: ferric ions and hydroxyl radicals produced by intense soft X rays.
Radiation Research. Roč. 193, č. 4 (2020), s. 372-382. ISSN 0033-7587. E-ISSN 1938-5404
R&D Projects: GA MŠMT EF16_027/0008215; GA ČR GA19-03314S
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Grant - others:MOBILITY FZU(XE) CZ.02.2.69/0.0/0.0/16_027/0008215
Institutional support: RVO:68378271
Keywords : ferric ions in aqueous environment * induced by soft X rays * hydroxyl radicals * Fricke chemical dosimeter
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.841, year: 2020
Method of publishing: Limited access
https://doi.org/10.1667/RR15520.1

A standard Fricke dosimeter was used to measure the absorbed dose via the oxidation yields of Fe3+ ions in an aqueous environment induced by soft X rays within the -water window- spectral range. We also exploited the property of a neutral solution containing terephthalic acid as a tool for selective detection of OH radicals. Both dosimetric systems were irradiated using the experimental pulsed laser-plasma soft X-ray source as well as conventional 1.25-MeV gamma rays. Radiation chemical yields of Fe3+ ions and OH radicals were determined to be 5.13 x 10–1 μmol.J–1, (4.95 100eV–1) and 2.33 x 10–2 μmol.J–1 (0.23 100eV–1), respectively. Measurements were supported by Monte Carlo simulations to estimate the linear energy transfer of the water window radiation. The simulation results are in good agreement with expected linear energy transfer of ions inducing the same Fe3+ ion and OH radical radiation chemical yield.
Permanent Link: http://hdl.handle.net/11104/0310553