Microdosimetry near the Trajectory of High-Energy Heavy Ions

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Abstract
Single-event energy distributions were measured in a 1.3-.mu.m-diameter site as a function of radial distance from the trajectory of high-energy iron ions having an energy of about 600 MeV/amu. It was found that beyond distances of a few micrometers the average lineal energy of the (mostly single) secondary electrons (.delta. rays) is of the order of 3 keV/.mu.m. This is similar to the value found in a medium irradiated by 170-keV photons. The frequency-mean specific energy for .delta. the rays occurring at large distances from the path of the primary ion exceeds the calculated (radial) absorbed dose by two orders of magnitude.

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