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