Atomic and nuclear properties of materials:
Liquid krypton (Kr)

Quantity	Value	Units	Value	Units
Atomic number	36
Atomic mass	83.798(2)	g mole-1
Specific gravity	2.42	g cm-3
Minimum ionization	1.357	MeV g-1cm2	3.281	MeV cm-1
Nuclear collision length	90.0	g cm-2	37.21	cm
Nuclear interaction length	149.4	g cm-2	61.80	cm
Radiation length	11.37	g cm-2	4.703	cm
Critical energy	17.03	MeV (for e-)	16.51	MeV (for e+)
Molière radius	14.16	g cm-2	5.857	cm
Plasma energy	29.37	eV
Muon critical energy	277.	GeV
Melting point	115.8	K	-157.4	C
Boiling point @ 1 atm	119.9	K	-153.2	C
Index of refraction (@ STP, Na D)	1.30

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
Note: Index of refraction at boiling point, 1 atm.
Table of isotopes
x ray mass attenuation coefficients