Atomic and nuclear properties of materials:
Holmium (Ho)

Quantity	Value	Units	Value	Units
Atomic number	67
Atomic mass	164.93032(2)	g mole-1
Density	8.80	g cm-3
Mean excitation energy	650.0	eV
Minimum ionization	1.170	MeV g-1cm2	10.29	MeV cm-1
Nuclear collision length	107.2	g cm-2	12.18	cm
Nuclear interaction length	185.3	g cm-2	21.07	cm
Pion collision length	130.9	g cm-2	14.88	cm
Pion interaction length	212.3	g cm-2	24.13	cm
Radiation length	7.23	g cm-2	0.8224	cm
Critical energy	8.86	MeV (for e-)	8.55	MeV (for e+)
Molière radius	17.31	g cm-2	1.968	cm
Plasma energy	54.47	eV
Muon critical energy	165.	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