Atomic and nuclear properties of materials:
Meitnerium (Mt)

Quantity	Value	Units
Atomic number	109
Atomic mass	[268.1387]	g mole-1
Specific gravity	??	g cm-3
Minimum ionization	1.123	MeV g-1cm2
Nuclear collision length	122.7	g cm-2
Nuclear interaction length	217.5	g cm-2
Radiation length	5.08	g cm-2
Critical energy	5.96	MeV (for e-)
Molière radius	18.04	g cm-2
Plasma energy	68.74	eV
Muon critical energy	115.	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, given 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