Atomic and nuclear properties of materials:
Polymethylmethacrylate (acrylic, [CH2C(CH3)(COOCH3)]n)
QuantityValueUnits ValueUnits
<Z/A> 0.53937     
Density 1.19 g cm-3   
Mean excitation energy 74.0 eV   
Minimum ionization 1.929 MeV g-1cm2 2.296 MeV cm-1
Nuclear collision length 58.1 g cm-2 48.79 cm
Nuclear interaction length 82.8 g cm-2 69.54 cm
Pion collision length 85.5 g cm-2 71.86 cm
Pion interaction length 114.7 g cm-2 96.39 cm
Radiation length 40.55 g cm-2 34.07 cm
Critical energy 85.79 MeV (for e-) 83.51 MeV (for e+)
Molière radius 10.02 g cm-2 8.422 cm
Plasma energy 23.09 eV   
Muon critical energy 1107. GeV   
Index of refraction (@ STP, Na D) 1.49     
Composition:
Elem ZAtomic frac* Mass frac*
H
1
8.00
0.080538
C
6
5.00
0.599848
O
8
2.00
0.319614
* 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