Atomic and nuclear properties of materials:
Calcium (Ca)

Quantity	Value	Units	Value	Units
Atomic number	20
Atomic mass	40.078(4)	g mole-1
Specific gravity	1.55	g cm-3
Minimum ionization	1.655	MeV g-1cm2	2.566	MeV cm-1
Nuclear collision length	75.8	g cm-2	48.89	cm
Nuclear interaction length	119.8	g cm-2	77.31	cm
Radiation length	16.14	g cm-2	10.42	cm
Critical energy	29.56	MeV (for e-)	28.71	MeV (for e+)
Molière radius	11.58	g cm-2	7.471	cm
Plasma energy	25.34	eV
Muon critical energy	447.	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