Atomic and nuclear properties of materials:
Polystyrene ([C6H5CHCH2]n)
QuantityValueUnits ValueUnits
<Z/A> 0.53768     
Density 1.06 g cm-3   
Mean excitation energy 68.7 eV   
Minimum ionization 1.936 MeV g-1cm2 2.052 MeV cm-1
Nuclear collision length 57.5 g cm-2 54.24 cm
Nuclear interaction length 81.7 g cm-2 77.07 cm
Pion collision length 85.0 g cm-2 80.16 cm
Pion interaction length 113.7 g cm-2 107.2 cm
Radiation length 43.79 g cm-2 41.31 cm
Critical energy 93.11 MeV (for e-) 90.65 MeV (for e+)
Molière radius 9.97 g cm-2 9.409 cm
Plasma energy 21.75 eV   
Muon critical energy 1183. GeV   
Index of refraction (@ STP, Na D) 1.59     
Composition:
Elem ZAtomic frac* Mass frac*
H
1
8.00
0.077418
C
6
8.00
0.922582
* 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