Atomic and nuclear properties of gypsum (plaster of Paris, CaSO4$\cdot$H2O)
QuantityValueUnits ValueUnits
<Z/A> 0.51113     
Specific gravity 2.320 g cm-3   
Mean excitation energy 129.7 eV   
Minimum ionization 1.738 MeV g-1cm2 4.033 MeV cm-1
Nuclear collision length 65.4 g cm-2 28.19 cm
Nuclear interaction length 97.7 g cm-2 42.12 cm
Pion collision length 92.3 g cm-2 39.80 cm
Pion interaction length 129.1 g cm-2 55.66 cm
Radiation length 24.61 g cm-2 10.61 cm
Critical energy 46.77 MeV (for e-) 45.45 MeV (for e+)
Molière radius 11.16 g cm-2 4.810 cm
Plasma energy ωp 31.38 eV   
Muon critical energy 663. GeV   
Composition:
Elem ZAtomic frac* Mass frac
H
1
4.00
0.023416
O
8
6.00
0.557572
S
16
1.00
0.186215
Ca
20
1.00
0.232797
* 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