element
Information about Actinium-235:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:235.051102±0.000454amu #
    Excess Mass (Δ):47.601000±0.423000MeV #
    Binding Energy:1779.530000±0.423000MeV #
    β- Decay Energy:3.351000±0.426000MeV #
"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.