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 - in addition to radon and francium - the single ordinary radioelement which purely has short-Lived isotopes, thereby with the exception of experiments with . . weighable" quantities of the point. this suggests that every one to be had information on physics and chemistry of this aspect are 12 sixteen in keeping with experiments at the tracer scale with 10- to ten- g - and this may additionally no longer switch in destiny simply because no longer-Lived isotopes as but recognized are to be anticipated. when you consider that the single isotope of At happening within the typical decay sequence, 219At, effects from the zero. 005% a-branching of 223Fr which itself is produced via the single 1. 38% a-branching of 227 Ac - a member of the 235U sequence - there isn't any probability to get better big quantities of 219At from traditional resources for medical learn of At. All experiences, consequently, are being performed with the isotopes 209At to 211At having half-lives within the few hours quarter and being got via irradiation of bismuth with a-particles through (a,xn) reactions or through proton irradiation of heavy components through spallation reactions. The usually used isotope is 7. 22 h 211At. the short separation of the bought At isotopes is not any very tough method and is both being performed by way of rainy adsorption-precipitation concepts or applying its excessive volatility through destilling in air.
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Additional info for At Astatine
GmeLIn Handbook Astatine (At) References on pp. 8% [48,49), 8S±3%  in  an intensity ratio I (~+): I (E) = S1 :49 is proposed (see also Fig. 3-5, p. 27) . S 94 ±S 100  b) 47±S 93±S 100 About 2 keV higher values are given in [39, SO, 63] . Two additional lines at 603 and 618 keV were observed by . Recommended values, based on [46, SO]. decay scheme : the a decay populates the ground state and the first excited state in 198Bi [28,29] E+~ + decay, see Fig . 3-S, p. 27 Fig. 3- 6 204 At -e...
Gmelin Handbook Astatine (At) Astatine-206 I i - ... ; ..... .. on ~ 0 0 0 ~ ~ ~ . ~ ... , O; .... ~ -- t- 43 '0 - " (~ I o . -- - - - -- - -- . r-. -- - - _. - - t--t----t- - -- - - --- _. __ ----- 0 - 1 - - - - -- ~ ------ - - - - --+-1 - -1- - -- 1- - .. o 44 Nuclear Properties of Astatine Isotopes Table 3/8 Energies and Relative Intensities of Prominent y Rays and Conversion Electrons Following the E + ~+ Decay of 206At. (All Y lines with I~ > 1 are given; 33 y lines with Ey;£ 2559 keV were omitted.
026 y (405) 56 . AI218 - 2s 0 6 ,694. 653 ~- Y(259, 334. 881 o. n83 ~ ~. 261 . 1064 . (571 . (18 426 2& . , fl),li 01 n . 6. ns '1151~ Po 197 'lI$ r II. 5 s Po 195 to. 5. 5. 959 u ... &~U3 ylO9 11&'. ol'l ~- Section of Karlsruhe Chart of Nuclides [79), explanations on p . 22. 028. 970 0 7. o • 14,8s Fr208 Fr209 58,6 Fr 210 50,0 3,18 m , ,,6. 0. 5 m 280 0 6. 5. l:J,';8 In r; Q 5,587 n 6. 83 Bi 97 II. 71 ... ..... s n 1y211g II. :~I . 288.. 501' n. 788: 'ee: 1110.. . St . '·.... W'" , ..... ,c.
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.)
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