Atomic and nuclear properties of materials:
Barium sulfate BaSO4
QuantityValueUnits ValueUnits
<Z/A> 0.44561     
Specific gravity 4.50 g cm-3   
Minimum ionization 1.406 MeV g-1cm2 6.329 MeV cm-1
Nuclear collision length 82.4 g cm-2 18.31 cm
Nuclear interaction length 131.0 g cm-2 29.12 cm
Radiation length 11.64 g cm-2 2.587 cm
Critical energy 17.55 MeV (for e-) 17.00 MeV (for e+)
Molière radius 14.06 g cm-2 3.125 cm
Plasma energy 40.81 eV   
Muon critical energy 285. GeV   
Composition:
Elem ZAtomic frac* Mass frac*
O
8
4.00
0.274212
S
16
1.00
0.137368
Ba
 56
1.00
0.588420
* 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