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Examples of exposure response curves to determine the absolute DNA strand break cross section for ssDNA. Irradiation was performed at 7 eV electron energy for the five oligonucleotide sequences (a) d(A4) black and d(A8) red, (b) d(A12) black and d(A16) red, and (c) d(A20) black. From the linear fit of the fluence and the dependence of strand breakage, the absolute strand break cross section can be obtained.
