element
Information about Iridium-199:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:198.973787±0.000044amu
    Excess Mass (Δ):-24.417100±0.041214MeV
    Binding Energy:1570.369127±0.041215MeV
    β- Decay Energy:2.990977±0.041003MeV
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.