TY - JOUR T1 - Report on the Separation of Ionium and Actinium from Certain Residues and on the Production of Helium by Ionium JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 85 IS - 575 SP - 77 EP - 81 PY - 1911/03/14/ UR - http://dx.doi.org/10.1098/rspa.1911.0023 M3 - doi:10.1098/rspa.1911.0023 AU - Boltwood, B. ER -