Atomic and nuclear properties of materials:
Phosphorus (P )

Quantity	Value	Units	Value	Units
Atomic number	15
Atomic mass	30.973762(2)	g mole-1
Specific gravity	2.20	g cm-3
Minimum ionization	1.613	MeV g-1cm2	3.548	MeV cm-1
Nuclear collision length	71.7	g cm-2	32.59	cm
Nuclear interaction length	111.4	g cm-2	50.62	cm
Radiation length	21.21	g cm-2	9.639	cm
Critical energy	37.92	MeV (for e-)	36.84	MeV (for e+)
Molière radius	11.86	g cm-2	5.391	cm
Plasma energy	29.74	eV
Muon critical energy	552.	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
x ray mass attenuation coefficients