Atomic and nuclear properties of berkelium (Bk)

Quantity	Value	Units	Value	Units
Atomic number	97
Atomic mass	[247.07031(4)]	g mole-1
Specific gravity	9.860	g cm-3
Mean excitation energy	952.0	eV
Minimum ionization	1.085	MeV g-1cm2	10.69	MeV cm-1
Nuclear collision length	119.9	g cm-2	12.16	cm
Nuclear interaction length	211.6	g cm-2	21.46	cm
Pion collision length	142.7	g cm-2	14.48	cm
Pion interaction length	237.8	g cm-2	24.11	cm
Radiation length	5.69	g cm-2	0.5772	cm
Critical energy	6.10	MeV (for e-)	5.87	MeV (for e+)
Molière radius	19.79	g cm-2	2.007	cm
Plasma energy ℏωp	56.70	eV
Muon critical energy	116.	GeV
Melting point	1259.	K	986.0	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 is no stable isotope, [atomic mass] is that of the longest-lived isotope known as of Jun 2017.
Table of isotopes via WIKIPEDIA