Absorbtion coefficients of heavy elements at 511 keV
W
MMMM reflect2C calling mucal with Z 74, E:  511.0 keV,  and material W 
MMMM Tot. cross sect. (barns/atom) 40.687092, photo: 16.492263, dens: 19.299999, abs. length: 2.571254 (1/cm)
Pb
MMMM reflect2C calling mucal with Z 82, E:  511.0 keV,  and material Pb
MMMM Tot. cross sect. (barns/atom) 52.805542, photo: 26.510853, dens: 11.340000, abs. length: 1.740235 (1/cm)
Th
MMMM reflect2C calling mucal with Z 88, E:  511.0 keV,  and material Th
MMMM Tot. cross sect. (barns/atom) 68.861819, photo: 39.951082, dens: 11.700000, abs. length: 2.091597 (1/cm)
U
MMMM reflect2C calling mucal with Z 92, E:  511.0 keV,  and material U 
MMMM Tot. cross sect. (barns/atom) 73.328181, photo: 43.837884, dens: 19.049999, abs. length: 3.533776 (1/cm)
Ag
MMMM reflect2C calling mucal with Z 47, E:  511.0 keV,  and material Ag
MMMM Tot. cross sect. (barns/atom) 16.410038, photo: 2.358452, dens: 10.500000, abs. length: 0.962063 (1/cm)