Atomic and nuclear properties of materials:
Lutetium (Lu)

Quantity	Value	Units	Value	Units
Atomic number	71
Atomic mass	174.9668(1)	g mole-1
Density	9.84	g cm-3
Mean excitation energy	694.0	eV
Minimum ionization	1.160	MeV g-1cm2	11.42	MeV cm-1
Nuclear collision length	108.9	g cm-2	11.07	cm
Nuclear interaction length	188.9	g cm-2	19.19	cm
Pion collision length	132.5	g cm-2	13.46	cm
Pion interaction length	215.7	g cm-2	21.92	cm
Radiation length	6.92	g cm-2	0.7037	cm
Critical energy	8.36	MeV (for e-)	8.06	MeV (for e+)
Molière radius	17.55	g cm-2	1.784	cm
Plasma energy	57.58	eV
Muon critical energy	157.	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