Page:Radio-activity.djvu/596

  effect of temperature on active deposit of, 390
  relative activity due to products of, 395
  active deposit of slow transformation, 397
  physical and chemical properties of radium D, E and F, 398 et seq. effect of temperature on active deposit of slow change, 401 separation of radium F by bismuth, 402 products of, 402 et seq. rate of transformation of radium D, 404 et seq. variation of the activity of the active deposit over long periods of time, 407 amounts of radium D, E and F in old radium, 408 variation of activity of, with time, 409 products of in pitchblende, 410 origin of radio-tellurium, 411 origin of polonium, 411, 412 origin of radio-lead, 413 temporary activity of inactive matter separated from pitchblende, 415 et seq. heat emission of, 419 et seq. heat emission of emanation from, 420, 431 heating effects due to products of, 433 theories of radio-activity of, 437 et seq. discussion of theories of radio-activity of, 441 et seq. energy of radiations, not derived from external source, 442 et seq. theory of radio-active change, 444 et seq. list of active products of, 449 amount of products of, 452 rate of change of, 457 life of radium, 457 origin of, 459 et seq. production of, by uranium, 459 et seq. amount of in 1 gram of uranium, 461 amount of, in minerals, 461 radio-activity of, independent of concentration, 466 et seq. disappearance of, 467 life of, independent of concentration, 468 conservation of radio-activity of, 469 et seq. loss of weight of, 473 experiments to determine loss of weight of, 474 total emission of energy from 1 gram of, 474 et seq. production of helium from, 476 helium, disintegration product of, 479 et seq. amount of helium from, 480 possible causes of disintegration of, 486 et seq. amount of, to account for heat of sun, 491 possible connection of with heat of sun, 491 possible connection of with heat of earth, 493 probable amount of, in earth, 495 amount of, in atmosphere, 495, 524 presence of, in atmosphere, 521 et seq.

Radium A
  decay curve of, 378
  radiation from, 381
  effect of, on activity curves, 386 et seq.
  connection with later changes, 392
  activity supplied by, 393

Radium B
  absence of rays in, 381
  effect of, on activity curves, 381 et seq.
  effect of temperature on, 390
  volatility of, 390
  absence of heating effect of, 433
  nature of rayless change in, 454, 552

Radium C
  radiations from, 381
  analysis of β ray curves of, 381 et seq.
  analysis of α ray curves of, 386 et seq.
  effect of temperature on, 390
  activity supplied by, 394 et seq.
  heating effect of, 425
  use of, as a source of β rays, 435
  explosive nature of change in, 456
  magnetic deflection of rays from, 543
  velocity and value of e/m for rays from, 544

Radium D
  origin of name of, 376
  connection of, with active deposit, 403
  period of transformation of, 406
  effect of, on variation of activity, 407
  presence in old radium, 408
  effect of, on activity of old radium, 409
  presence in pitchblende, 410
  connection with radio-lead, 413
  amount of, in 1 ton of uranium, 454

Radium E
  effect of temperature on, 401
  connection of, with β ray activity active deposit, 403, 400