By Klara Berei, Siegfried H. Eberle, H. W. Kirby, Helmut Münzel, Kurt Rössler, Arnulf Seidel, László Vasáros (auth.), Hans Karl Kugler, Cornelius Keller (eds.)
Astatine is - along with radon and francium - the one average radioelement which purely has short-Lived isotopes, thereby aside from experiments with . . weighable" quantities of the aspect. this means that each one on hand info on physics and chemistry of this aspect are 12 sixteen in line with experiments at the tracer scale with 10- to ten- g - and this may additionally now not swap in destiny simply because no longer-Lived isotopes as but identified are to be anticipated. in view that the single isotope of At taking place within the average decay sequence, 219At, effects from the zero. 005% a-branching of 223Fr which itself is produced by means of the one 1. 38% a-branching of 227 Ac - a member of the 235U sequence - there isn't any likelihood to get better giant quantities of 219At from ordinary resources for medical study of At. All stories, consequently, are being performed with the isotopes 209At to 211At having half-lives within the few hours sector and being got by means of irradiation of bismuth with a-particles through (a,xn) reactions or via proton irradiation of heavy parts through spallation reactions. The in most cases used isotope is 7. 22 h 211At. the quick separation of the acquired At isotopes isn't any very tricky approach and is both being performed through rainy adsorption-precipitation options or utilizing its excessive volatility via destilling in air.
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Extra info for At Astatine
34] postulate that in the decay of 208Fr a 7+ state with E* ~ 20 keY is populated in 204At. A metastable state at E* 600±20 keY with J1t 10and a half-life of 108 ± 10 ms is formed in heavy ion reactions with Au, Ir and Pt . 07) leading either to the ground or the first (~20 keY) state  Gmelin Handbook Astatine (At) References on pp. 28 MeV (syst) [30) y radiation: with 10 + /3+, see TabLe 3/5 further references [46, 50, 56 to 60) for conversion eLectrons see [56, 89) decay scheme: with a decay: The decay presumabLy popuLates a state with J1t 7+ and E*::::!
719. _ 22 Nuclear Properties of Astatine Isotopes A comprehensive description of structure and decay data for astatine isotopes has been prepared by Lederer et at. . Even more extensive compilations are published in the Nuclear Data Sheets. These compilations are updated at least every eight years. Each volume contains a table with the reference for the newest version of the compilation for an A chain. The information contained in the Nuclear Data Sheets is stored on magnetic tape and computer retrievals are possible.
Xx 0 o xxo 0 0 /:,. o 00 0 /:,. ) , 203At (0), 204At (0), 205At (x) , and 206At (\7) in the reaction 197Au(12C, . )  . 39 MeV (syst) y radiation : with E, see Table 3/4, further reference  decay scheme : the a decay feeds the ground state of 199Bi  . 4 keV. A tentativ decay scheme for 203At was proposed by  Table 3/4 Energies and Intensities of the y Rays Following the Electron Capture of 203At  . 7 keV transition in 203Bi. 03  . Y b) Y For absolute intensities per 100 decays Gmelin Handbook Astatine (At) Astatine-204 31 Fig.
At Astatine by Klara Berei, Siegfried H. Eberle, H. W. Kirby, Helmut Münzel, Kurt Rössler, Arnulf Seidel, László Vasáros (auth.), Hans Karl Kugler, Cornelius Keller (eds.)