Atomic and nuclear properties of materials:
Magnesium (Mg)

Quantity	Value	Units	Value	Units
Atomic number	12
Atomic mass	24.3050(6)	g mole-1
Density	1.74	g cm-3
Mean excitation energy	156.0	eV
Minimum ionization	1.674	MeV g-1cm2	2.913	MeV cm-1
Nuclear collision length	68.2	g cm-2	39.20	cm
Nuclear interaction length	104.1	g cm-2	59.84	cm
Pion collision length	94.2	g cm-2	54.13	cm
Pion interaction length	133.7	g cm-2	76.81	cm
Radiation length	25.03	g cm-2	14.39	cm
Critical energy	46.55	MeV (for e-)	45.25	MeV (for e+)
Molière radius	11.40	g cm-2	6.553	cm
Plasma energy	26.71	eV
Muon critical energy	659.	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