title: Microdosimetry near the trajectory of high-energy heavy ions.
abstract: Single-event energy distributions were measured in a 1.3-micron-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/micron. This is similar to the value found in a medium irradiated by 170-keV photons. The frequency-mean specific energy for delta rays occurring at large distances from the path of the primary ion exceeds the calculated (radial) absorbed dose by two orders of magnitude.
authors.affiliation: Pacific Northwest Laboratory, Richland, Washington 99532.
authors.forename: N F
authors.initials: NF
authors.lastname: Metting
authors.forename: H H
authors.initials: HH
authors.lastname: Rossi
authors.forename: L A
authors.initials: LA
authors.lastname: Braby
authors.forename: P J
authors.initials: PJ
authors.lastname: Kliauga
authors.forename: J
authors.initials: J
authors.lastname: Howard
authors.forename: M
authors.initials: M
authors.lastname: Zaider
authors.forename: W
authors.initials: W
authors.lastname: Schimmerling
authors.forename: M
authors.initials: M
authors.lastname: Wong
authors.forename: M
authors.initials: M
authors.lastname: Rapkin
mesh_terms: D007477:Ions; D007501:Iron; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D012062:Relative Biological Effectiveness
chemical_list: D007477:Ions; D007501:Iron