Atomic and nuclear properties of Freon-12 (CF2Cl2)
QuantityValueUnits ValueUnits
<Z/A> 0.47969     
Specific gravity (20° C, 1 atm) 1.120 g cm-3   
Mean excitation energy 143.0 eV   
Minimum ionization 1.645 MeV g-1cm2 1.843 MeV cm-1
Nuclear collision length 69.1 g cm-2 61.73 cm
Nuclear interaction length 105.8 g cm-2 94.46 cm
Pion collision length 95.3 g cm-2 85.08 cm
Pion interaction length 135.9 g cm-2 121.3 cm
Radiation length 23.65 g cm-2 21.11 cm
Critical energy 43.24 MeV (for e-) 42.05 MeV (for e+)
Molière radius 11.60 g cm-2 10.35 cm
Plasma energy ℏωp 21.12 eV   
Muon critical energy 615. GeV   
Composition:
Elem ZAtomic frac* Mass frac
C
6
1.00
0.099335
F
9
2.00
0.314247
Cl
 17
2.00
0.586418
* 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