Atomic and nuclear properties of materials:
Scandium (Sc)

Quantity	Value	Units	Value	Units
Atomic number	21
Atomic mass	44.955912(6)	g mole-1
Specific gravity	2.99	g cm-3
Minimum ionization	1.522	MeV g-1cm2	4.550	MeV cm-1
Nuclear collision length	77.7	g cm-2	26.01	cm
Nuclear interaction length	123.9	g cm-2	41.45	cm
Radiation length	16.55	g cm-2	5.535	cm
Critical energy	27.61	MeV (for e-)	26.79	MeV (for e+)
Molière radius	12.71	g cm-2	4.252	cm
Plasma energy	34.05	eV
Muon critical energy	422.	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