element
Information about Actinium-236:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:236.055178±0.000536amu #
    Excess Mass (Δ):51.398000±0.499000MeV #
    Binding Energy:1783.805000±0.499000MeV #
    β- Decay Energy:5.093000±0.581000MeV #
"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.