Damage induced by monochromatic synchrotron x-rays at the resonance absorption energy of intracellular phosphorous in yeast cells.
Two key experiments are analysed in terms of track structure parameters to obtain information on the excessive damage observed upon the production of inner shell vacancies at the resonance energy of bound phosphorus (Kobayashi et al., 1991) and for bromine incorporated into DNA (Usami et al., 1991). The relative damage enhancement factor due to resonance in phosphorus is 1.32. Additional Auger electron cascade events induced at resonance contribute about 35% to the total effect cross-section. In the bromine experiments, the intrinsic effectiveness is shown to be less than that for phosphorus. The effects can be quantified by the equilibrium electron fluences generated, combined with a quality specification determined from the net mean free path for ionization.
Jin
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Xinjiang Institute of Physics, Chinese Academy of Sciences, Urumqi.
Watt
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Kobayashi
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D001966:Bromine; D004249:DNA Damage; D004271:DNA, Fungal / Q000528:radiation effects*; D008433:Mathematics; D008962:Models, Theoretical; D010758:Phosphorus; D012441:Saccharomyces cerevisiae / Q000528:radiation effects*; D017356:Synchrotrons; D014965:X-Rays
D004271:DNA, Fungal; D010758:Phosphorus; D001966:Bromine