Microdosimetry near the trajectory of high-energy heavy ions.
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.
Metting
N F
NF
Pacific Northwest Laboratory, Richland, Washington 99532.
Rossi
H H
HH
Braby
L A
LA
Kliauga
P J
PJ
Howard
J
J
Zaider
M
M
Schimmerling
W
W
Wong
M
M
Rapkin
M
M
D007477:Ions; D007501:Iron; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D012062:Relative Biological Effectiveness
D007477:Ions; D007501:Iron