Atomic and nuclear properties of materials:
Sodium (Na)

Quantity	Value	Units	Value	Units
Atomic number	11
Atomic mass	22.98976928(2)	g mole-1
Density	0.971	g cm-3
Mean excitation energy	149.0	eV
Minimum ionization	1.639	MeV g-1cm2	1.592	MeV cm-1
Nuclear collision length	67.4	g cm-2	69.46	cm
Nuclear interaction length	102.6	g cm-2	105.6	cm
Pion collision length	93.4	g cm-2	96.22	cm
Pion interaction length	132.2	g cm-2	136.2	cm
Radiation length	27.74	g cm-2	28.56	cm
Critical energy	51.38	MeV (for e-)	49.99	MeV (for e+)
Molière radius	11.45	g cm-2	11.79	cm
Plasma energy	19.64	eV
Muon critical energy	712.	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