The Radioactive Substances Their Properties And Behaviour
The Radioactive Substances Their Properties And Behaviour
W Walter Makower
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M As the result of his early experiment he gives the values : V = 2-5 x 10' sec. - = 6 x 10 3 m It should be mentioned that this value of V is only the mean value for the rays examined, and there is considerable evidence, to be discussed later, to show that the rays from radium are emitted with velocities vary- ing between definite limits. Recently Mackenzie, 1 Rutherford, 2 and Rutherford and Hahn 3 have made an ex- tensive examination of the radiation from different radioactive bodies. As a r...esult of their experiments they conclude that, assum- ing that the particle carries the charge carried by the hydrogen ion in electrolysis, the a 1 Mackenzie, Phil. Mag. (6), X, p. 538, 1905. 2 Rutherford, Phil Mag. , Oct. , 1906. 3 Rutherford and Hahn, Phil. Mag. , Oct. , 1906. 8o THE RADIOACTIVE SUBSTANCES particles in every case examined have the same mass and are twice as heavy as the hydrogen atom. This is a result of the great- est importance. It has long been known that many of the minerals from which the radioactive elements are obtained are precisely those from which the gas helium, discovered by Sir William Ramsay, may be obtained.
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