radium

Example Sentences

• "Madame [Marie] Curie, working with her distinguished husband, isolated and first traced to its true origin the source of the marvellous power which has thus commenced to revolutionise our philosophy of physics. This new element has appropriately been named "Radium;" but it has also been shown that there are many other, though less powerful, radio-active elements, details of which are recorded in the sequel. To be precise, radium, per se, has not yet been isolated as a metal, but only in the form of salts,—chlorides and bromides. [...] It is supposed that the molecules of radium (composed of similar atoms) during their decomposition into those of the gas helium, are also frittered down into heat and, in part, are liberated as radio-activity."
• "The persistence of radio-activity on glass vessels which have contained radium is remarkable. Filters, beakers, and dishes used in the laboratory for operations with radium, after having been washed in the usual way, remain radio-active: a piece of blende screen held inside the beaker or other vessel immediately glowing with the presence of radium."
• "The object of this work is to determine how the radiums D, E, and F are separated from the substance known as radio-lead by certain chemical reactions. Recrystallisation of the nitrate from a neutral solution gradually removes the radium-F (polonium), which remains in the mother liquor, but does not appreciably influence the amounts of radiums D and E in the crystals."
• "Radium is formed by the breaking up of atoms of another element called uranium, but radium shows this breaking up process in its own atoms more distinctly than does uranium or any other element we know, and it is this breaking up that gives radium its astonishing properties such as the production of heat, electricity, and wave motions in the ether which are similar to the wave motions which produce the sensation of light to our eyes."
• "As for myself, I had to devote again a great deal of time to the preparation of several decigrammes of very pure radium chloride. With this I achieved, in 1907, a new determination of the atomic weight of radium, and in 1910 I was able to isolate the metal."
• "Of the total, fifteen cases were treated surgically, seventeen by radium, one by a combination of the two methods, three by radium and X-ray, one by the Percy cautery, two by the cautery, and two by the cautery preceding the application of radium."