Atomic and nuclear properties of lung (ICRP)
QuantityValueUnits ValueUnits
<Z/A> 0.54965     
Specific gravity 1.050 g cm-3   
Mean excitation energy 75.3 eV   
Minimum ionization 1.970 MeV g-1cm2 2.069 MeV cm-1
Nuclear collision length 58.6 g cm-2 55.85 cm
Nuclear interaction length 83.7 g cm-2 79.69 cm
Pion collision length 86.1 g cm-2 82.01 cm
Pion interaction length 115.6 g cm-2 110.1 cm
Radiation length 36.49 g cm-2 34.76 cm
Critical energy 78.72 MeV (for e-) 76.63 MeV (for e+)
Molière radius 9.83 g cm-2 9.362 cm
Plasma energy ℏωp 21.89 eV   
Muon critical energy 1031. GeV   
Composition:
Elem ZAtomic frac* Mass frac
H
1
1.00
0.101278
C
6
0.08
0.102310
N
7
0.02
0.028650
O
8
0.47
0.757072
Na
 11
0.00
0.001840
Mg
 12
0.00
0.000730
P
15
0.00
0.000800
S
16
0.00
0.002250
Cl
 17
0.00
0.002660
K
19
0.00
0.001940
Ca
 20
0.00
0.000090
Fe
 26
0.00
0.000370
Zn
 30
0.00
0.000010
* calculated from mass fraction data

For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries