TY - JOUR T1 - The Excitation of $ \gamma $-Rays by the $ \alpha $-Rays of Ionium and Radiothorium JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 88 IS - 602 SP - 217 EP - 229 PY - 1913/03/31/ UR - http://dx.doi.org/10.1098/rspa.1913.0022 M3 - doi:10.1098/rspa.1913.0022 AU - Chadwick, J. AU - Russell, A. ER -