Atomic and nuclear properties of materials:
Boron (B )

Quantity	Value	Units	Value	Units
Atomic number	5
Atomic mass	10.811(7)	g mole-1
Density	2.37	g cm-3
Mean excitation energy	76.0	eV
Minimum ionization	1.623	MeV g-1cm2	3.847	MeV cm-1
Nuclear collision length	58.0	g cm-2	24.47	cm
Nuclear interaction length	83.3	g cm-2	35.16	cm
Pion collision length	85.2	g cm-2	35.96	cm
Pion interaction length	115.5	g cm-2	48.75	cm
Radiation length	52.69	g cm-2	22.23	cm
Critical energy	93.95	MeV (for e-)	91.41	MeV (for e+)
Molière radius	11.89	g cm-2	5.018	cm
Plasma energy	30.17	eV
Muon critical energy	1170.	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