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Microdosimetry near the Trajectory of High-Energy Heavy Ions

Single-event energy distributions were measured in a 1.3-μm-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) seco...

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Bibliographic Details
Published in:Radiation research 1988-11, Vol.116 (2), p.183-195
Main Authors: Metting, N. F., Rossi, H. H., Braby, L. A., Kliauga, P. J., Howard, J., Zaider, M., Schimmerling, W., Wong, M., Rapkin, M.
Format: Article
Language:English
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Summary:Single-event energy distributions were measured in a 1.3-μm-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 (δ rays) is of the order of 3 keV/μm. This is similar to the value found in a medium irradiated by 170-keV photons. The frequency-mean specific energy for δ rays occurring at large distances from the path of the primary ion exceeds the calculated (radial) absorbed dose by two orders of magnitude.
ISSN:0033-7587
1938-5404
DOI:10.2307/3577456