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The question is which microscopic measure of the energy pattern does.","posed_since":"2000","precise":"Identify a nanodosimetric quantity, such as the ionization cluster size distribution in a volume of 2 to 10 nm, lineal energy on a 1 micron site, or a DNA-weighted energy-deposition metric, that collapses measured cell-survival and chromosome-aberration data for photons, protons and ions of LET from 0.2 to 200 keV/micron onto a single curve. 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