On a Method of Making Visible the Paths of Ionising Particles through a Gas

摘要: The tracks of individual α - or β -particles, ionising rays any kind, through a moist gas may be made visible by condensing water upon the ions set free, suitable form expansion apparatus being used for purpose. In order that clouds formed should give true picture trails left particles, it is necessary little no stirring up result from expansion. It desirable interval long enough to allow appreciable diffusion elapse between their liberation and production super-saturation condensation them; cloud-chamber free all other than those in freshly trails.