Atomic and nuclear properties of materials:
Terbium (Tb)

Quantity	Value	Units	Value	Units
Atomic number	65
Atomic mass	158.92535(2)	g mole-1
Specific gravity	8.23	g cm-3
Minimum ionization	1.188	MeV g-1cm2	9.777	MeV cm-1
Nuclear collision length	106.1	g cm-2	12.89	cm
Nuclear interaction length	183.0	g cm-2	22.24	cm
Radiation length	7.36	g cm-2	0.8940	cm
Critical energy	9.17	MeV (for e-)	8.85	MeV (for e+)
Molière radius	17.00	g cm-2	2.066	cm
Plasma energy	52.87	eV
Muon critical energy	169.	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
x ray mass attenuation coefficients