Page:Radio-activity.djvu/585

  comparison of, when exposed to γ rays and to hard X rays, 184
  of insulators, 209
  of air in caves and cellars, 507 et seq. of air in closed vessels, 531 et seq. variation of, in closed vessels with pressure and nature of gas, 534 variation of, with temperature for air in closed vessels, 536 increase of, with time, in a closed vessel, 537 Conservation of radio-activity examples of, 469 et seq.

Cooke, H. L.
  penetrating rays from the earth, 520
  number of ions per c.c. in closed vessels, 534
  radio-activity from ordinary matter, 536

Cooke, W. T. and Ramsay
  radio-activity produced by radiations of radium, 472

Corpuscle
  (see Electron) Crookes, Sir W. spectrum of radium, 17 spectrum of polonium, 23 nature of cathode rays, 73 nature of α rays, 142 scintillations produced by radium, 158 spinthariscope, 158 number of scintillations independent of pressure and temperature, 159 phosphorescence of diamond, 204 separation of Ur X, 219 theory of radio-activity, 441 Crookes and Dewar absence of nitrogen spectrum in phosphorescent light of radium at low pressures, 206 Crystallization effect of, on activity of uranium, 349 Curie, Mme permanence of uranium rays, 6 discovery of radio-activity of thorium, 10 radio-activity of uranium and thorium minerals, 11 relative activity of compounds of uranium, 12 coloration of radium crystals, 15 spectrum of radium, 16 discovery of polonium, 22 nature of a rays, 142 absorption of α rays from polonium, 163 secondary radiation tested by electric method, 188 slowly decaying excited activity from radium, 311 recovery of activity of radium, 375 bismuth made active by solution of barium, 417 Curie, P. magnetic deviation of radium rays by electric method, 114 conductivity of dielectrics under radium rays, 209 radio-activity of radium unaffected by temperature, 210 decay of activity of radium emanation, 247 discovery of excited radio-activity from radium, 295 heat emission of radium at low temperature and variation of heat emission with age of radium, 419 nature of the emanation, 439 Curie, M. et Mme discovery of radium, 13 charge carried by β rays, 121 luminosity of radium compounds, 205 production of ozone by radium rays, 213 coloration of glass by radium rays, 213 theory of radio-activity, 439 possible absorption by radio-elements of unknown radiations, 442 Curie, J. et P. quartz piezo-électrique, 105 et seq.

Curie, P. et Danne
  diffusion of radio-active emanation, 272
  decay of excited activity from radium, 309
  decay curves of radium and equation, 309
  occlusion of radium emanation in solids, 310
  changes in radium, 381
  effect of temperature on active deposit, 390

Curie, P. and Debierne
  evolution of gas from radium, 215
  active gases evolved from radium, 251
  phosphorescence produced by radium emanation, 252
  distribution of luminosity, 252
  rate of production of emanation independent of pressure, 266
  effect of pressure on amount of excited activity, 266, 317

Curie and Dewar
  production of helium by radium, 479

Curie, P. and Laborde
  heat emission of radium, 419