Atomic and nuclear properties of materials:
Osmium (Os)

Quantity	Value	Units	Value	Units
Atomic number	76
Atomic mass	190.23(3)	g mole-1
Density	22.6	g cm-3
Minimum ionization	1.132	MeV g-1cm2	25.55	MeV cm-1
Nuclear collision length	111.4	g cm-2	4.936	cm
Nuclear interaction length	194.1	g cm-2	8.600	cm
Pion collision length	134.8	g cm-2	5.974	cm
Pion interaction length	220.8	g cm-2	9.783	cm
Radiation length	6.68	g cm-2	0.2959	cm
Critical energy	7.75	MeV (for e-)	7.47	MeV (for e+)
Molière radius	18.26	g cm-2	0.8091	cm
Plasma energy	86.53	eV
Muon critical energy	146.	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