Atomic and nuclear properties of materials:
Thulium (Tm)

Quantity	Value	Units	Value	Units
Atomic number	69
Atomic mass	168.93421(2)	g mole-1
Density	9.32	g cm-3
Mean excitation energy	674.0	eV
Minimum ionization	1.170	MeV g-1cm2	10.90	MeV cm-1
Nuclear collision length	107.9	g cm-2	11.57	cm
Nuclear interaction length	186.7	g cm-2	20.03	cm
Pion collision length	131.5	g cm-2	14.11	cm
Pion interaction length	213.6	g cm-2	22.92	cm
Radiation length	7.03	g cm-2	0.7544	cm
Critical energy	8.59	MeV (for e-)	8.28	MeV (for e+)
Molière radius	17.36	g cm-2	1.863	cm
Plasma energy	56.22	eV
Muon critical energy	161.	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