Atomic and nuclear properties of materials:
Zirconium (Zr)

Quantity	Value	Units	Value	Units
Atomic number	40
Atomic mass	91.224(2)	g mole-1
Density	6.51	g cm-3
Mean excitation energy	393.0	eV
Minimum ionization	1.349	MeV g-1cm2	8.777	MeV cm-1
Nuclear collision length	91.9	g cm-2	14.12	cm
Nuclear interaction length	153.4	g cm-2	23.58	cm
Pion collision length	116.6	g cm-2	17.92	cm
Pion interaction length	181.4	g cm-2	27.89	cm
Radiation length	10.20	g cm-2	1.567	cm
Critical energy	14.74	MeV (for e-)	14.27	MeV (for e+)
Molière radius	14.67	g cm-2	2.254	cm
Plasma energy	48.67	eV
Muon critical energy	248.	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