. The book of photography; practical, theoretical and applied. Fig. J20.—Sample of PiTCHULENot:. the uranium had been extracted from it,and found that it was more radio-activethan uranium itself. Eventually a bodywas isolated from the residue which was300 times more active than uranium. Thiswas named Another new sub-stance was isolated, which the Curiesnamed actinum, and finally radium wasdiscovered, possessing one million timesthe activity of Becquerels salts. Radium,fi-om its extreme rarity, as well as itsproperties of emitting heat and lightwithout any perceptible diminution in i
. The book of photography; practical, theoretical and applied. Fig. J20.—Sample of PiTCHULENot:. the uranium had been extracted from it,and found that it was more radio-activethan uranium itself. Eventually a bodywas isolated from the residue which was300 times more active than uranium. Thiswas named Another new sub-stance was isolated, which the Curiesnamed actinum, and finally radium wasdiscovered, possessing one million timesthe activity of Becquerels salts. Radium,fi-om its extreme rarity, as well as itsproperties of emitting heat and lightwithout any perceptible diminution in itsbulk, has aioused great interest, and hasbeen the subject of so many articles innewspapers and other publications that itis not necessary here to devote muchspace to its peculiar properties. It is 710 THE BOOK OF PHOTOGKAPHY. separated from the residue of pitchblendeby a series of complicated chemical opera-tions, one ton of material yielding only afew grains of radium in the form of the. Fig. 921.—Glass Tube containing Kadum. bromide or chloride of the metal. Radiumhas the highest atomic weight of all theelements, namely, 225. A glass tube con-taining radium is shown by Fig. 921.
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