Atomic and nuclear properties of materials:
Ammonia (NH₃)

Quantity	Value	Units	Value	Units
<Z/A>	0.59719
Specific gravity (20° C, 1 atm)	8.26E-04	g cm-3
Minimum ionization	2.265	MeV g-1cm2	1.871E-03	MeV cm-1
Nuclear collision length	56.8	g cm-2	6.876E+04	cm
Nuclear interaction length	79.5	g cm-2	9.620E+04	cm
Pion collision length	84.5	g cm-2	1.023E+05	cm
Pion interaction length	111.5	g cm-2	1.350E+05	cm
Radiation length	40.87	g cm-2	4.948E+04	cm
Critical energy	121.70	MeV (for e-)	119.12	MeV (for e+)
Molière radius	7.12	g cm-2	8622.	cm
Plasma energy	0.64	eV
Muon critical energy	1469.	GeV
Index of refraction (@ STP, Na D)	376.	(n-1)x106

Composition:

Elem	Z	Atomic frac*	Mass frac*
H	1	3.00	0.177547
N	7	1.00	0.822453
* 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