Atomic and nuclear properties of materials:
Rubber butyl (C4H8)n
QuantityValueUnits ValueUnits
<Z/A> 0.57034     
Density 0.920 g cm-3   
Minimum ionization 2.079 MeV g-1cm2 1.912 MeV cm-1
Nuclear collision length 56.1 g cm-2 61.00 cm
Nuclear interaction length 78.5 g cm-2 85.30 cm
Pion collision length 83.7 g cm-2 91.00 cm
Pion interaction length 110.4 g cm-2 120.0 cm
Radiation length 44.77 g cm-2 48.67 cm
Critical energy 101.66 MeV (for e-) 98.99 MeV (for e+)
Molière radius 9.34 g cm-2 10.15 cm
Plasma energy 20.87 eV   
Muon critical energy 1281. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
H
1
8.00
0.143711
C
6
4.00
0.856289
* calculated from mass fraction data.

Explanation of some entries
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PS PDF TEXT
Table of muon dE/dx and Range: PS PDF TEXT