Atomic and nuclear properties of materials:
Tissue-equivalent gas (Propane based)
QuantityValueUnits ValueUnits
<Z/A> 0.55027     
Specific gravity (20° C, 1 atm) 1.83E-03 g cm-3   
Minimum ionization 2.068 MeV g-1cm2 3.778E-03 MeV cm-1
Nuclear collision length 57.6 g cm-2 3.153E+04 cm
Nuclear interaction length 81.6 g cm-2 4.470E+04 cm
Pion collision length 85.1 g cm-2 4.660E+04 cm
Pion interaction length 113.6 g cm-2 6.220E+04 cm
Radiation length 40.91 g cm-2 2.240E+04 cm
Critical energy 109.50 MeV (for e-) 107.13 MeV (for e+)
Molière radius 7.92 g cm-2 4338. cm
Plasma energy 0.91 eV   
Muon critical energy 1335. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
H
1
1.00
0.102672
C
6
0.47
0.568940
N
7
0.02
0.035022
O
8
0.18
0.293366
* 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