Atomic and nuclear properties of gypsum (plaster of Paris, CaSO₄$\cdot$H₂O)

Quantity	Value	Units	Value	Units
<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 ℏωp	31.38	eV
Muon critical energy	663.	GeV

Composition:

Elem	Z	Atomic 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