TY - JOUR T1 - The Nature of the $ \gamma $-Rays Excited by $ \beta $-Rays JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 86 IS - 590 SP - 513 EP - 529 PY - 1912/06/27/ UR - http://dx.doi.org/10.1098/rspa.1912.0043 M3 - doi:10.1098/rspa.1912.0043 AU - Gray, J. ER -