Wall-less ion-counting nanodosimetry applied to protons.
A wall-less ion-counting nanodosemeter, conceived for precise ionisation-cluster measurements in an accelerator environment, is described. The technique provides an accurate means for counting single radiation-induced ions, in dilute gas models of condensed matter. The sensitive volume dimensions, a few tissue-equivalent nm in diameter by a few tens of nm, are tunable by a proper choice of the gas pressure and electric fields; nanometric sub-sections can be electronically selected. Detailed ion-cluster distributions are presented for protons of 7.15, 13.6 and 19.3 MeV, in biologically relevant DNA-like sensitive volumes of low-pressure propane. Experimental results are compared to model simulations.
Weizmann Institute of Science, 76100 Rehovot, Israel. guy.garty@weizmann.ac.il
G
G
Garty
S
S
Shchemelinin
A
A
Breskin
R
R
Chechik
I
I
Orion
G P
GP
Guedes
R
R
Schulte
V
V
Bashkirov
B
B
Grosswendt
D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D008962:Models, Theoretical; D009010:Monte Carlo Method; D011522:Protons; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods
D011522:Protons