The Radioactive Substances: Their Properties and Behaviour

actinium active deposit Alpha rays Ångström atomic weight barium bismuth Boltwood cathode rays centimetre charge carried chemical considered constant contained corpuscles crystals cubic centimetre Curie and Danne decay curves deflected density detected discovery earth effect electric field electrometer electroscope emana experiments exposed fact fall to half fluorescence gases give rise gramme of radium half its activity heat helium hydrogen hypothesis induced activity investigation ionization J. J. Thomson known LENOX AND TILDEN Madame Curie magnetic field measured ment method minerals negatively charged obtained ordinary metals phenomena Phil pitchblende polonium potential pressure produced quantity of emanation quantity of radium radiation emitted radio radioactive bodies radioactive elements radioactive substances radium bromide radium chloride radium emanation radium salt rate of decay removed Röntgen rays Rutherford and Soddy seen separated shown solution temperature thorium emanation tion transformed tube uranium velocity wire