element
Information about Protactinium-240:

WikipediaNeutron Cross SectionsX-Ray TransitionsX-Ray Attenuation

    Mass-Energy Data:

    Atomic Mass:240.060980±0.000320amu #
    Excess Mass (Δ):56.802000±0.298000MeV #
    Binding Energy:1809.121000±0.298000MeV #
    β- Decay Energy:4.093000±0.298000MeV #
"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.