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  • Title: Heavy-ion-induced free radical formation in solid DNA-constituents: quantitative and structural aspects.
    Author: Hüttermann J, Schaefer A.
    Journal: Int J Rad Appl Instrum A; 1989; 40(10-12):915-21. PubMed ID: 2559061.
    Abstract:
    Electron spin resonance (ESR) spectroscopy was used to study free radical formation in solid, polycrystalline pellets of DNA-constituents. Dose-yield curves were obtained at low (ca 90 K) and ambient temperatures, and were analyzed for initial G-values (radicals per 100 eV absorbed energy). At both temperatures, values of one or more orders of magnitude below the corresponding x-ray values were found. Combination of x-ray and heavy-ion irradiation indicated an enhanced radical destruction as probable cause of reduced G-values. Structural aspects as analyzed from the ESR-powder spectra revealed differences in initial, low-temperature radical population and in decay reactions upon annealing between heavy-ion bombardment and low-LET irradiation.
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