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COMMITTEE ON NUCLEAR SCIENCE S. K. Allison, Chairman University of Chicago R. D. Evans, Vice Chairman Mass. Institute of Technology Lewis Slack, Secretary National Research Council E. C. Anderson Los Alamos Sci. Laboratory N. E. Ballon U.S. Naval Radiological Defense Laboratory Martin J. Berger National Bureau of Standards C. J. Borkowski Oak Ridge Natl. Laboratory Robert G. Cochran A & M College of Texas Herbert Goldstein Columbia University Bernd Kahn Taft Sanitary Engineering Center Jerry B. Marion University of Maryland H. L. Platzman Argonne National Laboratory Ernest C. Pollard Pennsylvania State University Katherine Way Oak Ridge National Laboratory George W. Wetherlll University of California (Los Angeles) LIAISON MEMBERS Paul C. Aebersold Atomic Energy Commission Ralph G. Allen Air Force Office of Scientific Research J. Howard McMillen National Science Foundation SUBCOMMITTEE ON RABOCHEM1STRY N. E. Ballon, Chairman U. S. Naval Radiological Defense Laboratory G. R. Choppln Florida State University H. M. Clark Rensselaer Polytechnic Institute R. M. Diamond Lawrence Radiation Laboratory A. W. Fairhall University of Washington Jerome Hudis Brookhaven National Laboratory J. D. Knight Los Alamos Scientific Laboratory W. E. Nervlk Lawrence Radiation Laboratory J. M. Nielsen General Electric Company (Richland) G. D. O'Kelley Oak Ridge National Laboratory R. P. Schuman Atomic Energy Division Phillips Petroleum Company (Idaho Falls) E. P. Steinberg Argonne National Laboratory D. N. Sunderman Battelle Memorial Institute J. W. Winchester Massachusetts Institute of Technology

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LI RAD1OCHEM1STRY OF ARSEN1C HAROLD C. BEARD Florida State University, Tallahassee, Florida, January 1960 revised by J. G. CUNINGHAME Atomic Energy Research Establishment, Harwell, Didcot, Berkshire, England, January 1965 Issued: November 1965 Subcommittee on Radiochemistry National Academy of Sciences — National Research Council Printed in USA. Price $1.00. Available from the Clearinghouse for Federal Scientific and Technical Information, National Bureau of Standards, U. S. Department of Commerce, Springfield, Virginia. 22151

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FOREWORD The Subcommittee on Radiochemistry is one of a number of subcommittees working under the Committee on Nuclear Science within the National Academy of Sciences - National Research Council. Its members represent government, industrial, and university laboratories in the areas of radlochemistry and nuclear chemistry. Support for the activities of this and other subcommittees of the Committee on Nuclear Science is provided by a grant from the National Science Foundation. The subcommittee has concerned itself with preparation of publications, encouraging and supporting activities in nuclear education,sponsoring symposia on selected current topics in radiochemistry and nuclear chemistry, and investigating special problems as they arise. A series of monographs on the radio- chemistry of essentially all the elements and on radiochemical techniques is being published. Initiation and encouragement of publication of articles on nuclear education in various subject areas of chemistry have occurred, and development and improvement of certain education activities (e.g., laboratory and demonstration experiments with radioactivity) have been encouraged and assisted. Radioactive contamination of reagents and materials has been investigated and specific recommendations made. This series of monographs has resulted from the need for comprehensive compilations of radiochemical and nuclear chemical information. Each monograph collects in one volume the pertinent information required for radiochemical work with an individual element or with a specialized technique. The U. S. Atomic Energy Commission has sponsored the printing of the series. Comments and suggestions for further publications and activi- ties of value to persons working with radioactivity are welcomed by the Subcommittee. N. E. Ballou, Chairman Subcommittee on Radiochemistry ill

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Preface to the revised edition A considerable number of papers have appeared in the literature on the radiochemistry and chemistry of arsenic since the first edition of the monograph was published. The general form and much of the original content of the monograph has been retained, substantial additions being made where necessary. The reviser would like to thank Mr. R. W. C1arke, Information Officer of the Chemistry Division, A.E.R.E., for his great help in conducting a very thorough literature search. iv

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CONTENTS I A selection of general reviews of the inorganic and analytical chemistry of arsenic. 1 II General reviews of the radiochemistry of arsenic. 2 III Summary of statistical physical properties of arsenic. 2 IV Table of isotopes. 3 V Decay schemes. 6 VI y-spectra. 13 VII Relevant portion of chart of the nuclides. 17 VIII Review of the chemistry of arsenic of interest to radiochemists. 19 IX Dissolution of arsenic samples. 23 X Counting techniques pertinent to arsenic isotopes. 23 XI General remarks concerning the detailed radiochemical procedures of Section XII. 24 XII Collection of detailed radiochemical procedures. 25