Radiochemistry, Vol 1: Volume 1 (Specialist Periodical Reports - Radiochemistry)

Product description Excerpt. © Reprinted by permission. All rights reserved. Radiochemistry Volume 1A Review of the Literature Published Between July 1969 and August 1971By G. W. A. NewtonThe Royal Society of ChemistryCopyright © 1972 The Chemical SocietyAll rights reserved.ISBN: 978-0-85186-254-5ContentsChapter 1 Chemical Effects of Nuclear Transformations By G. W. A. Newton, Chapter 2 Superheavy Elements By J. D. Hemingway, Chapter 3 Radiochemical Methods of Analysis By G. R. Gilmore, CHAPTER 1Chemical Effects of Nuclear TransformationsBY G. W. A. NEWTON1 IntroductionThis review is concerned mainly with solids, because this reflects the Reporter's interests. A small section is devoted to solutions. It is hoped that future volumes will contain a more comprehensive coverage of the subject and include the gas- and liquid-phase studies.Material has been arranged within the sections of this chapter such that the mention of each recoil atom follows the order of elements in the long form of the Periodic Table. It is clear that much of the work has been concentrated on a few elements, with cobalt complexes being the clear leader in terms of the extent of work published. With the exception of 32P and 35S, there is a paucity of information on p-block element systems.Sources of information on earlier work include the I.A.E.A. publications of symposia, the review by Harbottle, and the review by Maddock and Wolfgang. The proceedings of the Chemical Society Symposium at Cambridge in July 1969 were not published. More recently, a book has been published on 'Hot-atom Chemistry', and the subject has been reviewed by Matsuura. Several articles have been written giving a general introduction to recoil chemistry, and outlining significant factors of such in chemistry and in the solid state.Much interesting work has been carried out with recoil particles separated from, or interacting with, materials. The construction of a low-energy (5 — 10 keV) ion accelerator for hot-atom chemical research has been described.The importance of the analytical procedure used must still be emphasized, because within the period of this Report there have been reports of difficulties with several of the systems which had been in use. One must remain suspicious of intercomparison of different systems, for example cation and hydrate effects, because often different sources of the same compound give different results. Much information can be obtained from studying variables on the same compound, particularly if this is a pure and well-defined system. The use of ion implantation has far-reaching implications in industry as well as in recoil chemistry research. Volume 311 (1969) of the Proceedings of the Royal Society contains several articles on ion implantation; in particular, a general theory of the slowing down of ions is given as well as empirical measurements of the range and energy loss of implanted ions.Calculations have been made of the range of light ions in solids and of the spectra of energy deposited by 'heavy particles' (protons through to oxygen) in tissue-equivalent material. In beta decay there is evidence of multiparticle interaction during the deceleration of slow atoms in solids. Empirical methods have been given for measuring energy loss and path lengths of recoils in solids. In the determination of recoil ranges in gases, diffusion effects should be considered. The measurements of recoil distances have been used to obtain lifetimes of excited states in nuclear reactions.The recoil effect is useful for separating radionuclides. A fully mechanized apparatus has been described for the continuous separation of short-lived radionuclides. The use of chemical reactions of recoil atoms has been utilized for on-line separations of the required isotope in studies of nuclear reactions, using electromagnetic isotope separators. The systems studied were:[FORMULA OMITTED]With the exception of antimony, reasonable yields were obtained using this technique, and these could be improved by passing small amounts of carrier or reaction gases over the irradiated target during product evaporation.The identification of element 102 by a double-recoil technique following alpha decay is well known. Much of the American evidence for the existence and isolation of element 104 hinges on the identification of the element 102 daughter particle which could be separated from the element 104 parent by a recoil method (see for example ref. 26). The recoil technique has been further exploited in the separation of fission fragments. The measurement of short half-lives (ca. 300 μs) in a radioactive series is facilitated by recoil separation techniques. Recoils have been used to enrich 47Ca and 132Cs as well as to produce Xe compounds.Another important property of a recoil, and related to its range, is its charge. The Bohr-Lindhard theory used for the calculation of electron capture and loss, applicable to heavy ions passing through solids, has been modified. The conc