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 ± 0.94) × 10-1 µmol·J-1 (4.95 ± 0.91 100eV-1) and (2.33 ± 0.35) × 10-2 µmol·J-1 (0.23 ± 0.03 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.

Institute of Optoelectronics Military University of Technology Kaliskiego 2 Str 00 908 Warsaw Poland

Institute of Physics of the Czech Academy of Sciences Na Slovance 1999 2 182 21 Prague 8 Czech Republic

Institute of Plasma Physics of the Czech Academy of Sciences Za Slovankou 3 182 00 Prague 8 Czech Republic

Lebedev Physical Institute of the Russian Academy of Sciences Leninskij Prospekt 53 119991 Moscow Russia

Citace poskytuje Crossref.org

Breaking the DNA by soft X-rays in the water window reveals the scavenging and temporal behaviour of ·OH radicals