Table 1.

Calculated attenuation of high-energy ions by fragmentation in aluminum using geometric cross sections.

Ion	5 g cm−2 Al	10 g cm−2 Al	20 g cm−2 Al	40 g cm−2 Al
12C	0.128	0.240	0.423	0.667
16O	0.141	0.261	0.455	0.702
24Mg	0.160	0.295	0.503	0.753
28Si	0.169	0.309	0.522	0.772
56Fe	0.213	0.381	0.617	0.853