Atomic and nuclear properties of materials:
Lanthanum (La)

Quantity	Value	Units	Value	Units
Atomic number	57
Atomic mass	138.90547(7)	g mole-1
Density	6.15	g cm-3
Minimum ionization	1.231	MeV g-1cm2	7.574	MeV cm-1
Nuclear collision length	102.4	g cm-2	16.63	cm
Nuclear interaction length	175.3	g cm-2	28.48	cm
Pion collision length	126.4	g cm-2	20.53	cm
Pion interaction length	202.6	g cm-2	32.92	cm
Radiation length	8.14	g cm-2	1.322	cm
Critical energy	10.63	MeV (for e-)	10.27	MeV (for e+)
Molière radius	16.24	g cm-2	2.639	cm
Plasma energy	45.79	eV
Muon critical energy	188.	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