Atomic and nuclear properties of technetium (Tc)

Quantity	Value	Units	Value	Units
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 ℏωp	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