Atomic and nuclear properties of materials:
Bismuth (Bi)

Quantity	Value	Units	Value	Units
Atomic number	83
Atomic mass	208.98040(1)	g mole-1
Density	9.75	g cm-3
Mean excitation energy	823.0	eV
Minimum ionization	1.128	MeV g-1cm2	10.99	MeV cm-1
Nuclear collision length	114.3	g cm-2	11.73	cm
Nuclear interaction length	200.2	g cm-2	20.54	cm
Pion collision length	137.6	g cm-2	14.11	cm
Pion interaction length	226.7	g cm-2	23.26	cm
Radiation length	6.29	g cm-2	0.6454	cm
Critical energy	7.39	MeV (for e-)	7.13	MeV (for e+)
Molière radius	18.04	g cm-2	1.851	cm
Plasma energy	56.70	eV
Muon critical energy	141.	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