Atomic and nuclear properties of materials:
Gadolinium (Gd)

Quantity	Value	Units	Value	Units
Atomic number	64
Atomic mass	157.25(3)	g mole-1
Specific gravity	7.90	g cm-3
Minimum ionization	1.188	MeV g-1cm2	9.383	MeV cm-1
Nuclear collision length	105.8	g cm-2	13.39	cm
Nuclear interaction length	182.4	g cm-2	23.09	cm
Radiation length	7.48	g cm-2	0.9472	cm
Critical energy	9.34	MeV (for e-)	9.01	MeV (for e+)
Molière radius	17.00	g cm-2	2.151	cm
Plasma energy	51.67	eV
Muon critical energy	171.	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