Atomic and nuclear properties of materials:
Eye lens (ICRP)
QuantityValueUnits ValueUnits
<Z/A> 0.54977     
Density 1.10 g cm-3   
Mean excitation energy 73.3 eV   
Minimum ionization 1.971 MeV g-1cm2 2.168 MeV cm-1
Nuclear collision length 58.4 g cm-2 53.10 cm
Nuclear interaction length 83.3 g cm-2 75.69 cm
Pion collision length 85.9 g cm-2 78.08 cm
Pion interaction length 115.2 g cm-2 104.7 cm
Radiation length 37.58 g cm-2 34.17 cm
Critical energy 81.05 MeV (for e-) 78.89 MeV (for e+)
Molière radius 9.83 g cm-2 8.939 cm
Plasma energy 22.41 eV   
Muon critical energy 1057. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
H
1
1.00
0.099269
C
6
0.16
0.193710
N
7
0.04
0.053270
O
8
0.41
0.653751
* 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