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