Atomic and nuclear properties of materials:
Rubidium (Rb)

Quantity	Value	Units	Value	Units
Atomic number	37
Atomic mass	85.4678(3)	g mole-1
Density	1.53	g cm-3
Mean excitation energy	363.0	eV
Minimum ionization	1.356	MeV g-1cm2	2.078	MeV cm-1
Nuclear collision length	90.4	g cm-2	59.01	cm
Nuclear interaction length	150.3	g cm-2	98.13	cm
Pion collision length	115.2	g cm-2	75.18	cm
Pion interaction length	178.5	g cm-2	116.5	cm
Radiation length	11.03	g cm-2	7.198	cm
Critical energy	16.61	MeV (for e-)	16.10	MeV (for e+)
Molière radius	14.08	g cm-2	9.191	cm
Plasma energy	23.47	eV
Muon critical energy	275.	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