Atomic and nuclear properties of materials:
Gallium (Ga)

Quantity	Value	Units	Value	Units
Atomic number	31
Atomic mass	69.723(1)	g mole-1
Density	5.90	g cm-3
Minimum ionization	1.379	MeV g-1cm2	8.140	MeV cm-1
Nuclear collision length	86.0	g cm-2	14.57	cm
Nuclear interaction length	141.2	g cm-2	23.92	cm
Pion collision length	111.1	g cm-2	18.82	cm
Pion interaction length	169.7	g cm-2	28.74	cm
Radiation length	12.47	g cm-2	2.113	cm
Critical energy	18.57	MeV (for e-)	17.98	MeV (for e+)
Molière radius	14.24	g cm-2	2.412	cm
Plasma energy	46.69	eV
Muon critical energy	304.	GeV

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
Explanation of some entries
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients