Atomic and nuclear properties of technetium (Tc)
QuantityValueUnits ValueUnits
Atomic number 43     
Atomic mass [97.90722(3)] g mol-1   
Density 11.50 g cm-3   
Mean excitation energy 428.0 eV   
Minimum ionization 1.325 MeV g-1cm2 15.24 MeV cm-1
Nuclear interaction length 156.8 g cm-2 13.64 cm
Nuclear collision length 93.5 g cm-2 8.132 cm
Pion interaction length 184.5 g cm-2 16.05 cm
Pion collision length 118.1 g cm-2 10.27 cm
Radiation length 9.58 g cm-2 0.8331 cm
Critical energy 13.46 MeV (for e-) 13.01 MeV (for e+)
Muon critical energy 230. GeV   
Molière radius 15.09 g cm-2 1.313 cm
Plasma energy ωp 64.76 eV   
Melting point 2430. K 2157. C
Boiling point @ 1 atm 4538. K 4265. C
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries
Note: Since there are no stable isotopes, [atomic mass] is that of the longest-lived isotope known as of Jun 2017.
Table of isotopes via WIKIPEDIA
x ray mass attenuation coefficients from NIST