Atomic and nuclear properties of materials:
Astatine (At)

Quantity	Value	Units
Atomic number	85
Atomic mass	[209.98715(6)]	g mole-1
Density	??	g cm-3
Mean excitation energy	825.0	eV
Minimum ionization	1.160	MeV g-1cm2
Nuclear collision length	114.5	g cm-2
Nuclear interaction length	200.5	g cm-2
Pion collision length	137.7	g cm-2
Pion interaction length	227.0	g cm-2
Radiation length	6.07	g cm-2
Critical energy	7.60	MeV (for e-)
Molière radius	16.93	g cm-2
Plasma energy	41.00	eV
Muon critical energy	141.	GeV
Melting point	575.2	K

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 isotope (8.1 hr).
Note: Density 5.0 g/cm³ assumed.
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients