Atomic and nuclear properties of materials:
Water (vapor) (H2O)
QuantityValueUnits ValueUnits
<Z/A> 0.55509     
Specific gravity (20° C, 1 atm) 7.56E-04 g cm-3   
Mean excitation energy 71.6 eV   
Minimum ionization 2.052 MeV g-1cm2 1.552E-03 MeV cm-1
Nuclear collision length 58.5 g cm-2 7.737E+04 cm
Nuclear interaction length 83.3 g cm-2 1.102E+05 cm
Pion collision length 86.0 g cm-2 1.137E+05 cm
Pion interaction length 115.2 g cm-2 1.524E+05 cm
Radiation length 36.08 g cm-2 4.772E+04 cm
Critical energy 98.24 MeV (for e-) 96.11 MeV (for e+)
Molière radius 7.79 g cm-2 1.030E+04 cm
Plasma energy 0.59 eV   
Muon critical energy 1231. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
H
1
2.00
0.111894
O
8
1.00
0.888106
* 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