Radio-activity |
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absorbed absorption actinium active deposit active matter active substance aluminium amount of emanation atom barium Becquerel bismuth cathode rays chemical compound condensation constant curve cylinder diffusion distance earth electric field electrometer electron electroscope emanating power emitted energy experimental experiments exponential law exposure falling to half gases gram of radium half value heat emission heating effect helium hydrogen increase ionization J. J. Thomson layer magnetic field maximum measured method minerals minutes Miss Brooks Mme Curie negatively charged number of ions number of particles observed obtained Phil phosphorescent photographic Phys pitchblende plate polonium present pressure properties proportional quantity radiation radio-active matter radio-active substances radio-elements radium bromide radium chloride radium emanation rate of decay removed saturation current screen shown in Fig shows solution ẞ rays surface temperature testing vessel thickness thorium emanation transformed tube uraninite uranium vacuum tube velocity wire