Track nanodosimetry of an alpha particle.
Experimental measurements and calculations are described of ionisation distributions in propane wall-less gas cavities of about 20 nm simulated size, performed at different distances from a 244Cm alpha particle track. Ionisation events are detected one by one by collecting electrons from the sensitive volume and by separating them with a drift column. Experimental results and Monte Carlo calculations indicate that, in the delta ray cloud, conditional probability curves, average cluster size and the ratio of second moment above first moment of the cluster distribution are invariant with track distance.
Dipartimento di Fisica dell'Università di Padova, via Marzolo 8, I-35100 Padova, Italy. DENARDO@LNL.INFN.IT
L
L
De Nardo
P
P
Colautti
W Y
WY
Baek
B
B
Grosswendt
A
A
Alkaa
P
P
Ségur
G
G
Tornielli
D000512:Alpha Particles; D016000:Cluster Analysis; D004867:Equipment Design; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D012680:Sensitivity and Specificity