Atomic and nuclear properties of soft tissue (ICRP)
QuantityValueUnits ValueUnits
<Z/A> 0.55121     
Specific gravity 1.000 g cm-3   
Mean excitation energy 72.3 eV   
Minimum ionization 1.982 MeV g-1cm2 1.982 MeV cm-1
Nuclear collision length 58.3 g cm-2 58.28 cm
Nuclear interaction length 83.0 g cm-2 82.96 cm
Pion collision length 85.8 g cm-2 85.78 cm
Pion interaction length 114.9 g cm-2 114.9 cm
Radiation length 37.63 g cm-2 37.63 cm
Critical energy 81.68 MeV (for e-) 79.51 MeV (for e+)
Molière radius 9.77 g cm-2 9.770 cm
Plasma energy ℏωp 21.39 eV   
Muon critical energy 1064. GeV   
Composition:
Elem ZAtomic frac* Mass frac
H
1
1.00
0.104472
C
6
0.19
0.232190
N
7
0.02
0.024880
O
8
0.38
0.630238
Na
 11
0.00
0.001130
Mg
 12
0.00
0.000130
P
15
0.00
0.001330
S
16
0.00
0.001990
Cl
 17
0.00
0.001340
K
19
0.00
0.001990
Ca
 20
0.00
0.000230
Fe
 26
0.00
0.000050
Zn
 30
0.00
0.000030
* 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