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AbstractChromosomes of budding yeast Saccharomyces pastorianus were used to determine the extent of DNA double-strand breaks (DSBs) induced by x-rays (3050 keV) and 14 MeV neutrons. The yeast chromosomes were separated by pulsed-field gel electrophoresis (PFGE) and the proportion of unbroken molecules corresponding to the largest chromosome no. IV (1500 kbp) was used to calculate the DSB frequency...