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Titlebook: At Astatine; Klara Berei,Siegfried H. Eberle,László Vasáros,Han Book 1985Latest edition Springer-Verlag Berlin Heidelberg 1985 Francium.Is

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發(fā)表于 2025-3-21 16:19:46 | 只看該作者 |倒序?yàn)g覽 |閱讀模式
期刊全稱At Astatine
影響因子2023Klara Berei,Siegfried H. Eberle,László Vasáros,Han
視頻videohttp://file.papertrans.cn/164/163884/163884.mp4
學(xué)科分類Gmelin Handbook of Inorganic and Organometallic Chemistry - 8th edition
圖書封面Titlebook: At Astatine;  Klara Berei,Siegfried H. Eberle,László Vasáros,Han Book 1985Latest edition Springer-Verlag Berlin Heidelberg 1985 Francium.Is
影響因子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 w
Pindex Book 1985Latest edition
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Production, Isolation, and Purification of Astatine Isotopes, This reaction yields At isotopes with half-lives measured in hours, whereas the longest-lived At isotope in nature is 0.9-min .At. Not surprisingly, .At is also the only naturally occurring At isotope ever isolated by chemical means.
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Handling of Astatine,grè [1 to 5] after more than 16 years of intensive search and discussion, cf. e.g. [6 to 15, 31], about 800 publications have been devoted totally or partially to the physical and chemical properties of that element. The majority belongs to the domain of nuclear physics. The 24 isotopes of astatine
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Irradiation and Self-Irradiation of Astatine Compounds,eed that the radiation effects of .At are mainly due to the energetic α particles. For a more detailed treatment of irradiation and self-irradiation effects it is, however, necessary to consider the different kinds of radiation emitted in the decay of .At and .At somewhat more closely. The largest c
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Gmelin Handbook of Inorganic and Organometallic Chemistry - 8th editionhttp://image.papertrans.cn/b/image/163884.jpg
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-Adic Model for Population Growthndent existence. Isotopes of At occur naturally in both the 4n + 2 (.U) and the 4n + 3 (.U) decay chains. .At, a member of the artificial 4n + 1 (.Np) series, has also been detected in natural materials.
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