Atomic and nuclear properties of materials:
Eye lens (ICRP)

Quantity	Value	Units	Value	Units
<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	Z	Atomic 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