Material   Density (g/cm3) Z-ratio
Aluminum Al 2.70 1.80
Antimony Sb 6.62 0.768
Arsenic As 5.73 0.966
Beryllium Be 1.85 0.543
Boron B 2.54 0.389
Cadmium Cd 8.64 0.682
Cadmium Sulfide CdS 4.83 1.02
Cadmium Telluride CdTe 5.85 0.980
Calcium Fluoride CaF_2 3.18 0.775
Carbon (graphite) C 2.25 3.26
Chromium Cr 7.20 0.305
Cobalt Co 8.71 0.343
Copper Cu 8.93 0.437
Gallium Ga 5.93 0.593
Gallium Arsenide GaAs 5.31 1.59
Germanium Ge 5.35 0.516
Gold Au 19.3 0.381
Indium In 7.30 0.841
Indium Antimonide InSb 5.76 0.769
Iridium Ir 22.4 0.129
Iron Fe 7.86 0.349
Lead Pb 11.3 1.13
Lead Sulfide PbS 7.50 0.566
Lithium Fluoride LiF 2.64 0.774
Magnesium Mg 1.74 1.61
Magnesium Oxide MgO 3.58 0.411
Manganese Mn 7.20 0.377
Molybdenum Mo 10.2 0.257
Nickel Ni 8.91 0.331
Niobium Nb 8.57 0.493
Palladium Pd 12.0 0.357
Platinum Pt 21.4 0.245
Potassium Chloride KCl 1.98 2.05
Selenium Se 4.82 0.864
Silicon Si 2.32 0.712
Silicon Dioxide (fused quartz) SiO_2 2.20 1.07
Silver Ag 10.5 0.529
Silver Bromide AgBr 6.47 1.18
Silver Chloride AgCl 5.56 1.32
Sodium Chloride NaCl 2.17 1.57
Tantalum Ta 16.6 0.262
Tellurium Te 6.25 0.900
Tin Sn 7.30 0.724
Titanium Ti 4.50 0.628
Titanium Oxide TiO 4.9 not available
Titanium Dioxide TiO_2 4.3 not available
Tungsten W 19.3 0.163
Tungsten Carbide WC 15.6 0.151
Uranium U 18.7 0.238
Vanadium V 5.96 0.530
Yttrium Y 4.34 0.835
Zinc Zn 7.04 0.514
Zinc Oxide ZnO 5.61 0.556
Zinc Selenide ZnSe 5.26 0.722
Zinc Sulfide ZnS 4.09 0.775