The story of Pittsburgh: Radium

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Multivolume work

Identifikator:: 1831622599

Document type:: Multivolume work

Title:: The story of Pittsburgh

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1919-1930

Collection:: Economics Books

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Volume

Identifikator:: 1831623226

URN:: urn:nbn:de:zbw-retromon-239786

Document type:: Volume

Title:: Radium

Volume count:: Vol. 1, nr. 7

Place of publication:: Pittsburgh

Publisher:: First National Bank

Year of publication:: 1921

Scope:: [ca. 18] Seiten

Digitisation:: 2022

Collection:: Economics Books

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Chapter

Document type:: Multivolume work

Structure type:: Chapter

Title:: Radium

Collection:: Economics Books

Standard Chemical Company, in 1918. Since ther, -roduction of the Company has been as follows. 1913... “rams 1914. . 1915. . 1916. . 1917......... 1918......... 1019.......... 1920. .......... Cea 1921 to April 1st... ........ the Total................. 71.8 Radium preparations in the United States are spoken of and measured in terms of Radium element. Until recently in European scientific circles, Radium has been referred to in the terms of Radium bromide. Crystalline radium bromide when pure, contains 53.6 per cent of Radium element. This fact and the method of measure- ment of Radium preparations in Europe prior to the adoption of the International Radium Standard, had not a little to do with the earlier unsatisfactory work with Radium. There was no common standard. The original method of measuring Radium consisted in comparing iis activity with that of Uranium. During the fourteen years this system of measurement prevailed, scientific men spoke of Radium as “two million times more active than Uranium.” Trained minds, of course, understood that what was meant was that the quantity of electrical energy emitted in the rays of the Radium, small though it was, was two million times greater than that contained in the rays from Uranium. Such a ratio of comparison was entirely unsuitable for use especially with small quantities, and about 1912, by common consent, Madame Curie was asked to prepare what would be an International Radium Standard. This is deposited at Paris. Duplicates are in the leading capitals of the world, and Radium preparations are now measured by comparing the electrical energy carried by the gamma rays from the preparation to be measured with the energy carried by the gamma rays of

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