Atomic and nuclear properties of materials:
Yttrium (Y )

Quantity	Value	Units	Value	Units
Atomic number	39
Atomic mass	88.90585(2)	g mole-1
Density	4.47	g cm-3
Mean excitation energy	379.0	eV
Minimum ionization	1.359	MeV g-1cm2	6.075	MeV cm-1
Nuclear collision length	91.3	g cm-2	20.43	cm
Nuclear interaction length	152.2	g cm-2	34.05	cm
Pion collision length	116.0	g cm-2	25.96	cm
Pion interaction length	180.3	g cm-2	40.34	cm
Radiation length	10.41	g cm-2	2.329	cm
Critical energy	15.30	MeV (for e-)	14.81	MeV (for e+)
Molière radius	14.43	g cm-2	3.228	cm
Plasma energy	40.35	eV
Muon critical energy	256.	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