Radiation dose–response curves: cell repair mechanisms vs. ion track overlapping Agata Kowalska, Konrad Czerski, Elena Nasonova, Polina Kutsalo and Eugen Krasavin Eur. Phys. J. D, 71 12 (2017) 332 Published online: 19 December 2017 DOI: 10.1140/epjd/e2017-80013-2