Atomic and nuclear properties of materials:
Meitnerium (Mt)

Quantity	Value	Units
Atomic number	109
Atomic mass	[276.151(5)]	g mole-1
Density	??	g cm-3
Mean excitation energy	1115.0	eV
Minimum ionization	1.090	MeV g-1cm2
Nuclear collision length	123.7	g cm-2
Nuclear interaction length	219.6	g cm-2
Pion collision length	146.4	g cm-2
Pion interaction length	245.5	g cm-2
Radiation length	5.23	g cm-2
Critical energy	5.97	MeV (for e-)
Molière radius	18.57	g cm-2
Plasma energy	67.74	eV
Muon critical energy	112.	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
Note: Since there is no stable isotope, [atomic mass] is that of the longest-lived known isotope as of Jan 2007.
Note: Density 14.0 g/cm³ and I_eff = 1115 eV assumed in calculating critical energies and dE/dx.
Table of isotopes Warning: may not be current