Investigation on X-Rays and β -Rays by the Cloud Method. Part II. β -Rays

摘要: The method used in these investigations is that which was described papers communicated to the Royal Society 1911 and 1912. ionising rays are made pass through moist air, or other gas, water-vapour has been brought into super-saturated state by sudden expansion of gas. Each ion liberated becomes at once nucleus for condensation a visible droplet water; clouds drops thus formed immediately photographed. Very sharply defined pictures tracks particles—α- β-rays—may be obtained this way. When conditions suitably arranged, effects diffusion ions before their mobility destroyed water upon them, as well subsequent disturbance cloud convection currents negligible: photographs path particles, practically free from distortion, obtained. almost perfect straightness track very fast β-particle, when it occurs among crowd slower β-particles, gives convincing evidence complicated forms latter not due instrumental distortion.