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Dry infectious DNA of bacteriophage ΦΧ174 was irradiated in extremely thin layers with slow protons and the differential inactivation cross section determined for various proton energies in the range from 0.8 to 50 keV. Above 5 keV the inactivation cross section is independent of proton energy, it reaches a shallow minimum between 1 and 1.5 keV, and increases slightly at still smaller energies. By comparing the experimentally determined inactivation cross sections with the cross sections fordoi:10.1515/znb-1969-0313 fatcat:bq2vl27fobgvhn7t4bgatvr7gm