Atomic and nuclear properties of materials:
Cesium (Cs)

Quantity	Value	Units	Value	Units
Atomic number	55
Atomic mass	132.9054519(2)	g mole-1
Density	1.87	g cm-3
Mean excitation energy	488.0	eV
Minimum ionization	1.254	MeV g-1cm2	2.349	MeV cm-1
Nuclear collision length	101.2	g cm-2	54.01	cm
Nuclear interaction length	172.8	g cm-2	92.25	cm
Pion collision length	125.3	g cm-2	66.88	cm
Pion interaction length	200.2	g cm-2	106.9	cm
Radiation length	8.31	g cm-2	4.434	cm
Critical energy	11.34	MeV (for e-)	10.97	MeV (for e+)
Molière radius	15.53	g cm-2	8.292	cm
Plasma energy	25.37	eV
Muon critical energy	200.	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