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Author:
Publisher: PediaPress
ISBN:
Category :
Languages : en
Pages : 31
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Author:
Publisher: PediaPress
ISBN:
Category :
Languages : en
Pages : 31
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Author: Hans K. Kugler
Publisher: Springer Science & Business Media
ISBN: 3662058685
Category : Science
Languages : en
Pages : 305
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Book Description
Astatine is - besides radon and francium - the only natural radioelement which only has short-Lived isotopes, thereby excluding experiments with . . weighable" amounts of the element. This implies that all available data on physics and chemistry of this element are 12 16 based on experiments on the tracer scale with 10- to 10- g - and this will also not change in future because no longer-Lived isotopes as yet known are to be expected. Due to the fact that the only isotope of At occurring in the natural decay series, 219At, results from the 0. 005% a-branching of 223Fr which itself is produced by the only 1. 38% a-branching of 227 Ac - a member of the 235U series - there is no chance to recover substantial amounts of 219At from natural sources for sCientific research of At. All studies, therefore, are being done with the isotopes 209At to 211At having half-lives in the few hours region and being obtained by irradiation of bismuth with a-particles via (a,xn) reactions or by proton irradiation of heavy elements via spallation reactions. The mostly used isotope is 7. 22 h 211At. The fast separation of the obtained At isotopes is no very difficult procedure and is either being done by wet adsorption-precipitation techniques or making use of its high volatility by destilling in air.
Author: A. J. Downs
Publisher: Elsevier
ISBN: 1483158322
Category : Science
Languages : en
Pages : 509
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Book Description
The Chemistry of Chlorine, Bromine, Iodine and Astatine is a special edition that contains selected sections and addresses the needs of specialists in their respective fields. The text describes the general atomic properties of non-metals, particularly the halogens, as being the perfect series to study, both in physical and chemical terms. The book explains that the combination of the atomic properties implies excellent electronegativity values for the halogen atoms. The text also cites some behavior characteristics of halogens that are irregular, such as chlorine and bromine are similar but differ from fluorine on one side and iodine on the other. The book also compares the general methods of producing chlorine, bromine, or iodine by 1) oxidation of halide derivatives or 2) reduction of compounds of the halogens in positive oxidation states. The text then reviews the application of a complex valence theory that raises difficult questions about the bonding in halogen-oxygen molecules. The book also explains the biological behavior of astatine that accumulates in the liver or in the thyroid gland depending on the method of administration either as a radiocolloid or as a true solution. The book is suitable for molecular biologists and researchers, molecular chemists, and medical researchers.
Author: Gordon Lee Johnson
Publisher:
ISBN:
Category : Astatine
Languages : en
Pages : 20
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Author: Lawrence S. Germain
Publisher:
ISBN:
Category : Astatine
Languages : en
Pages : 10
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Author: Patricia W. Durbin
Publisher:
ISBN:
Category : Astatine
Languages : en
Pages : 12
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Author: United States. Dept. of Energy. Technical Information Center
Publisher:
ISBN:
Category :
Languages : en
Pages : 868
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Author: Klara Berei
Publisher:
ISBN:
Category : Astatine
Languages : en
Pages : 318
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1040
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Author:
Publisher: Krishna Prakashan Media
ISBN: 9788185842639
Category :
Languages : en
Pages : 356
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Book Description
