Published online by Cambridge University Press: 24 October 2008
(1) A method has been devised and applied for measuring the decay Constant of radium emanation, the method depending on careful comparisons with a simple electroscope under the most favourable conditions.
(2) A mean value for the Constant of radium emanation has been obtained, with an error unlikely to exceed 0·2 per cent.: λ = 0·1808 day−1, or half-period 3·833 days.
* Wien. Ber., 1911, vol. 120, p. 303.Google Scholar
† Le Radium, 1910, vol. 7, p. 33.CrossRefGoogle Scholar
‡ Zeit.fur Phys., 1921, vol. 5, p. 338.Google Scholar
§ Zeit. fur Phys., 1923, vol. 16, p. 266.CrossRefGoogle Scholar
‖ Comptes Rendus, 1924, vol. 78, p. 1809Google Scholar; Journal de Phys., 1924, vol. 5, p. 238.Google Scholar
* Phil. Mag., 1924, vol. 48, p. 1075.CrossRefGoogle Scholar