Page:Radio-activity.djvu/590

 secondary rays produced by γ rays, 189 measurement of radio-activity by means of, 442, 467 conservation of radio-activity measured by, 471

Gases evolved by radium, 215 presence of helium in gases from radium, 216

Gates, Miss F. effect of temperature on excited activity, 315 discharge of quinine sulphate, 530

Geitel natural conductivity of air in closed vessels, 501, 531

Geitel and Elster radio-active lead, 27 effect of magnetic field on conductivity produced by radium rays, 113 scintillations produced by active substances, 158 action of radium rays on spark, 208 photo-electric action of bodies coloured by radium rays, 214 radio-active matter in earth, 494 discovery of radio-active matter in atmosphere, 501 emanations from the earth, 507 radio-activity of air in caves, 507 radio-activity of the soil, 515 radio-activity of fango, 516 variation of radio-activity of air with meteorological conditions, 517 effect of temperature and pressure on radio-activity in atmosphere, 518

Giesel coloration of bunsen flame by radium, 15 separation of radium by crystallization of bromide, 15 emanating substance, 21 radio-active lead, 27 magnetic deviation of β rays, 113 decrease with time of luminosity of radio-active screen, 205 spectrum of phosphorescent light of emanium due to didymium, 206, 207 coloration of bodies by radium rays, 213 evolution of gases from radium, 215 action of radium rays on the eye, 217 emanation from the emanating substance, 250 luminosity produced by radium emanation, 251 decay of excited activity of emanium, 312 activity of radium dependent on age, 371 bismuth made active by radio-active solution, 417 temperature of radium bromide above air, 420

Gimingham and Rossignol decay of thorium emanation, 242

Glass coloration produced in, by radium rays, 213 phosphorescence produced in, by emanation, 252

Glew simple form of spinthariscope, and scintillations, 159

Globulin action of radium rays on, 214

Godlewski effect of crystallization on activity of uranium, 349 diffusion of uranium X, 350 separation of actinium X, 365 source of actinium emanation, 365 recovery and decay curves of actinium, 366 penetrating power of β and γ rays from actinium, 368 radiations from active products, 368

Goldstein canal rays, 78 coloration of bodies by radium rays, 213

Gonder, Hofmann, and Wölfl properties of radio-active lead, 27, 413

Grier and Rutherford magnetic deviation of β rays of thorium, 114 relative current due to α and β rays, 195 nature of rays from Ur X, 347

Hardy coagulation of globulin by radium rays, 214

Hardy and Miss Willcock coloration of iodoform solutions by radium rays, 214

Hardy and Anderson action of radium rays on the eye, 217

Harms number of ions per c.c. in closed vessel, 534

Hartmann spectrum of phosphorescent light of emanium, 206