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Author: W.R. Shea
Publisher: Springer Science & Business Media
ISBN: 9400971338
Category : History
Languages : en
Pages : 274
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Book Description
and less as the emanation unden\'ent radioactive decay, and it became motion less after about 30 seconds. Since this process was occurring very rapidly, Hahn and Sackur marked the position of the pointer on a scale with pencil marks. As a timing device they used a metronome that beat out intervals of approximately 1. 3 seconds. This simple method enabled them to determine that the half-life of the emanations of actinium and emanium were the same. Although Giesel's measurements had been more precise than Debierne's, the name of actinium was retained since Debierne had made the discovery first. Hahn now returned to his sample of barium chloride. He soon conjectured that the radium-enriched preparations must harbor another radioactive sub stance. The liquids resulting from fractional crystallization, which were sup posed to contain radium only, produced two kinds of emanation. One was the long-lived emanation of radium, the other had a short life similar to the emanation produced by thorium. Hahn tried to separate this substance by adding some iron to the solutions that should have been free of radium, but to no avail. Later the reason for his failure became apparent. The element that emitted the thorium emanation was constantly replenished by the ele ment believed to be radium. Hahn succeeded in enriching a preparation until it was more than 100,000 times as intensive in its radiation as the same quantity of thorium.
Author: W.R. Shea
Publisher: Springer Science & Business Media
ISBN: 9400971338
Category : History
Languages : en
Pages : 274
Get Book Here
Book Description
and less as the emanation unden\'ent radioactive decay, and it became motion less after about 30 seconds. Since this process was occurring very rapidly, Hahn and Sackur marked the position of the pointer on a scale with pencil marks. As a timing device they used a metronome that beat out intervals of approximately 1. 3 seconds. This simple method enabled them to determine that the half-life of the emanations of actinium and emanium were the same. Although Giesel's measurements had been more precise than Debierne's, the name of actinium was retained since Debierne had made the discovery first. Hahn now returned to his sample of barium chloride. He soon conjectured that the radium-enriched preparations must harbor another radioactive sub stance. The liquids resulting from fractional crystallization, which were sup posed to contain radium only, produced two kinds of emanation. One was the long-lived emanation of radium, the other had a short life similar to the emanation produced by thorium. Hahn tried to separate this substance by adding some iron to the solutions that should have been free of radium, but to no avail. Later the reason for his failure became apparent. The element that emitted the thorium emanation was constantly replenished by the ele ment believed to be radium. Hahn succeeded in enriching a preparation until it was more than 100,000 times as intensive in its radiation as the same quantity of thorium.
Author: Ruth Lewin Sime
Publisher: Univ of California Press
ISBN: 0520089065
Category : Women physicists
Languages : en
Pages : 564
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Book Description
She refused to participate in the Allied atomic bomb project and was greatly concerned about the development of nuclear weapons after the war.
Author: J. L. Heilbron
Publisher: Univ of California Press
ISBN: 0520341082
Category : Science
Languages : en
Pages : 660
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Book Description
The Radiation Laboratory in Berkeley, California, was the birthplace of particle accelerators, radioisotopes, and modern big science. This first volume of its history is a saga of physics and finance in the Great Depression, when a new kind of science was born. Here we learn how Ernest Lawrence used local and national technological, economic, and manpower resources to build the cyclotron, which enabled scientists to produce high-voltage particles without high voltages. The cyclotron brought Lawrence forcibly and permanently to the attention of leaders of international physics in Brussels at the Solvay Congress of 1933. Ever since, the Rad Lab has played a prominent part on the world stage. The book tells of the birth of nuclear chemistry and nuclear medicine in the Laboratory, the discoveries of new isotopes and the transuranic elements, the construction of the ultimate cyclotron, Lawrence's Nobel Prize, and the energy, enthusiasm, and enterprise of Laboratory staff. Two more volumes are planned to carry the story through the Second World War, the establishment of the system of national laboratories, and the loss of Berkeley's dominance of high-energy physics.
Author: Tsai-chien Chiang
Publisher: World Scientific
ISBN: 9814579130
Category : Science
Languages : en
Pages : 301
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Book Description
Narrating the well-lived life of the “Chinese Madame Curie” — a recipient of the first Wolf Prize in Physics (1978), the first woman to receive an honorary doctorate from Princeton University, as well as the first female president of the American Physical Society — this book provides a comprehensive and honest account of the life of Dr Wu Chien-Shiung, an outstanding and leading experimental physicist of the 20th century.
Author: James K. Laylin
Publisher: Chemical Heritage Foundation
ISBN: 9780841226906
Category : Biography & Autobiography
Languages : en
Pages : 820
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Book Description
Through new perspectives from a mix of original monographs, biographies, autobiographical memoirs, edited collections of essays and documentary sources, translations, classic reprints, and pictorial volumes, this series will document the individuals, ideas, institutions, and innovations that have created the modern chemcial sciences.
Author: John S. Rigden
Publisher: Springer Science & Business Media
ISBN: 3764389338
Category : Science
Languages : en
Pages : 252
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Book Description
Travelers differ.At one extreme are random travelers who see what they accidentally bump into.At the other extreme are the lock-step travelers who follow a banner (or a red umbrella) and look when and where a voice tells them to look. Between these extremes are the guide-book travelers who identify the whereabouts of those sites that interest them and they plan their sightseeing accordingly. If a traveler’s interests are captivated by the arts, guide books can be very helpful. For example, the table of contents of a current guide book for travelers going to G- many has sections on architecture, art, literature, music and cinema.The index gives page references for famous writers, musicians, and artists.Yet, while Germany was a dominate force in physical science during the 19th and into the 20th centuries and while the names and photos of prominent German physical scientists who worked in this period are sprinkled through the pages of textbooks, only one scientist is m- tioned by name:Albert Einstein is identified as the most famous citizen of Ulm.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 938
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Book Description
Covers physics and its place in the world.
Author: R.R. Bowker Company. Department of Bibliography
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 2006
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Book Description
Author: Stephen G. Brush
Publisher: Scholarly Title
ISBN:
Category : Science
Languages : en
Pages : 368
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Book Description
Author: Brigham Narins
Publisher: Gale Cengage
ISBN:
Category : Biography & Autobiography
Languages : en
Pages : 652
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Book Description
This updated second edition of Notable Twentieth-Century Scientists provides biographies of approximately 1,600 scientist in the natural, physical, and applied sciences, including astronomy, biology, botany, chemistry, earth science, mathematics, medicine, physics, technology, zoology, computer science, ecology, engineering, and environmental science. Entries highlight name, birth/death dates, nationality, and primary specialization; run from 400- 2500 words; list publications; and feature a section of further reading. All five volumes of the set begin with a list of entries and a chronology of major advances, and volume five ends with several indexes based on the scientist's specialization, gender, nationality/ethnicity, and subject. Over 400 scientists garner photographs. Diversity and internationalism are hallmarks of the set. Suitable for high school and college. c. Book News Inc.
