Abstract
Experimental nanodosimetry aims to develop a new concept of radiation quality, based on the correlation between initial features of particle tracks and late biological outcome. A direct proportionality has been observed between the cumulative probability of measuring at least k ionisations within a nanometric volume and inactivation cross sections at specific survival levels. Based on this proportionality, physical quantities which are measurable at the nanometre level can be used to estimate the alpha and beta parameters of the linear-quadratic dose-response model, provided that two proportionality factors are determined in a reference radiation field. This work describes the procedure and first results applied to published data for V79 cell survival after irradiation with protons and carbon ions.
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