Atomic and nuclear properties of materials:
Urea CO(NH2)2
QuantityValueUnits ValueUnits
<Z/A> 0.53284     
Specific gravity 1.32 g cm-3   
Minimum ionization 1.902 MeV g-1cm2 2.517 MeV cm-1
Nuclear collision length 59.1 g cm-2 44.66 cm
Nuclear interaction length 84.9 g cm-2 64.18 cm
Radiation length 38.75 g cm-2 29.29 cm
Critical energy 80.48 MeV (for e-) 78.32 MeV (for e+)
Molière radius 10.21 g cm-2 7.716 cm
Plasma energy 24.19 eV   
Muon critical energy 1049. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
H
1
4.00
0.067131
C
6
1.00
0.199999
N
7
2.00
0.466459
O
8
1.00
0.266411
* 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