Page:Radio-activity.djvu/595

Potential (cont.) gradient due to movement of ions, 65 Precht and Runge spectrum of radium, 17 atomic weight of radium, 18 heating effect of radium, 420 Pressure effect of, on velocity of ions, 46 effect of, on current through gases, 61 et seq. production of emanation independent of, 265 effect of, on distribution of excited activity, 317 effect of, on natural conductivity of air in closed vessels, 534 Products, radio-active list of, from radio-elements, 449 properties of, 449 amount of in radium, 452 et seq. radiations from, 455 Quartz piezo-électrique use of, in measurement of current, 105 Quinine sulphate discharging power of, 530 phosphorescence of, 530 Radiations emitted by uranium, 8 emitted by thorium, 10 emitted by radium, 18 emitted by actinium, 21 emitted by polonium, 23 method of measurement of, 82 et seq. methods of comparison of, 108 three kinds of, 109 analogy to rays from a Crookes tube, 110 relative ionizing and penetrating power of, 111 difficulties of comparative measurement of, 112 β rays, 113 α rays, 141 γ rays, 179 secondary rays, 187 comparison of ionization of α and β rays, 194 phosphorescent effect of, 201 et seq. physical actions of, 207 et seq. chemical actions of, 213 et seq. physiological actions of, 216 from the emanation, 263 from Ur X, 347 connection of, with heat emission, 421 et seq. from different active products, 455 conservation of energy of each specific type of, 469 et seq.

Radio-lead
  connection of, with polonium, 411 et seq.
  connection of, with radium D, 413

Radio-tellurium
  rate of decay of, 411
  connection of with radium F, 411

Radium
  discovery of, 13
  separation of, 13
  spectrum of, 16
  atomic weight of, 17
  radiations from, 18
  compounds of, 19
  nature of radiations from, 109
  β rays from, 113
  α rays from, 141
  γ rays from, 179
  secondary rays from, 187
  production of phosphorescence by, 201 et seq.
  spectrum of phosphorescent light of, 206
  physical actions of, 207 et seq.
  chemical actions of, 213 et seq.
  physiological actions of, 216
  emanation from, 246
  properties of emanation from, 247 et seq.
  chemical nature of emanation from, 267
  diffusion of emanation from, 269
  condensation of emanation from, 277
  amount of emanation from, 288
  volume of emanation from, 289
  spectrum of emanation from, 292
  excited radio-activity from, 295 et seq.
  decay of excited activity from, 306 et seq.
  difference in properties of radium and the emanation, 327
  nomenclature of products, 328
  theory of successive changes in, 330
  alteration of activity of, by removal of emanation, 371 et seq.
  recovery of activity of, after removal of emanation, 372
  effect of escape of emanation on recovery of activity of, 374
  non-separable activity of, 375
  period and properties of radium A, B and C, 376 et seq.
  analysis of active deposit of rapid changes of radium, 377
  analysis of β ray curves, 381 et seq.
  analysis of α ray curves, 386 et seq.
  equations of activity curves, 389