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active thorium deposit aluminium disintegration aluminium foil apparatus ATOMIC DISINTEGRATION atomic particles beryllium boron brass screw carrying C.T.R. Wilson cloud chamber complete dynamical picture conservation of energy cover glass disintegrated by bombardment disintegration of aluminium expansions per minute five H-particle fluorine forward direction gases H-particle track H-particles per million Harkins and Ryan Harkins and Schuh Harkins and Shadduck Holoubek incident alpha particles initial and final Kirsch lever arm million from aluminium million incident alpha molecular hydrogen natural H-particles nitrogen number of atoms number of expansions numbered light elements odd numbered light oxygen P.M.S. Blackett particles from thorium particles of range Phil phosphine phosphorus Photographs were taken Physik Proc produce good tracks protons per million radioactive contamination radium ranges in excess recoil atom Rutherford and Chadwick Ryan1 sodium specific heats ratio stopping power equivalent stray tracks taken of approximately thirty-six expansions thorium active deposit thorium-C yield from aluminium