Table 2: Polycrystalline lead, Ref. [12].

Isotope/Element v(Hz) vc(Hz) q S(ยต)
Pb6 15.9 14.7 1 1.59
Pb2 45.5 44.0 1 1.63
Pb 89.1 88.1 1 1.64
Sb 146 150 1 1.68
Br 221 228 1 1.68
Fe 311 327 1 1.69
44Ca 412 415 1 1.66
Cl 532 515 1 1.63
Ag 661 678 Ea 2 1.67
Pb 808 795 3 1.64
As 972 977 2 1.66
Cu 1133 1134 2 1.65
Sb 1313 1352 Ea 3 1.68
Ag 1512 1526 3 1.66
44Ca 1722 1665 2 1.62
1925 Eb
As 2170 2198 3 1.66
Sb 2405 2404 4 1.65
Cu 2685 2591 Ea 3 1.62
OR Ag 2685 2714 4 1.66
Fe 2920 2948 3 1.66
3230 Eb

a Coincident Elastic natural frequency
b Pure Elastic natural frequency