Atomic and nuclear properties of materials:
Silicon (Si)

Quantity	Value	Units	Value	Units
Atomic number	14
Atomic mass	28.0855(3)	g mole-1
Specific gravity	2.33	g cm-3
Minimum ionization	1.664	MeV g-1cm2	3.876	MeV cm-1
Nuclear collision length	70.2	g cm-2	30.16	cm
Nuclear interaction length	108.4	g cm-2	46.52	cm
Radiation length	21.82	g cm-2	9.370	cm
Critical energy	40.19	MeV (for e-)	39.05	MeV (for e+)
Molière radius	11.51	g cm-2	4.944	cm
Plasma energy	31.05	eV
Muon critical energy	582.	GeV
Melting point	1687.	K	1414.	C
Boiling point @ 1 atm	3538.	K	3265.	C
Index of refraction (@ STP, Na D)	3.95

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