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Description: Pilot-plant work on ion exchange separation of rare earths indicates that elution with HEDTA on hydrogen-form resin should conserve Sc. Then, after Sc, Lu, Yb, Tm, and Er are diverted to an auxiliary bed, the remaining rare earths can be resolved with EDTA. Data from investigations of rare-earth glycolate solubilities at 20 and 60 deg C are tabulated. In other work, the effectiveness of glycolic acid for fractionally precipitating rare earths was investigated, and the solubilities and composition rare-earth nitrilotriacetates were studied. Data on preparation of Y are given and information on physical, mechanical, and thermal properties of rare-earths is presented. Corrosion of Zr- Sc alloys in high temperature water was studied and data on the physical properties of rare-earth salts obtained during the report period are given. Preliminary results on the mass spectra of group IV-B and V-B elements are presented. Synthetic methods for preparing highly pure VOCl/sub 3/ and VOF/sub 3/ are reported. Results of studies on the fragmentation of N/sup 29/ molecule indicate that more /sup 15/N/sup +/ ions than /sup 14/N/sup +/ are produced by electron bombardment at 45 to 100 volts. A wet chemical procedure for N in metals and alloys by isotope dilution with an average precision of plus or minus 5% is reported. A study in which oxygen isotopes are quantitatively released by KBrF/sub 4/ from inorganic compounds snd determined by isotopic dilution is described. Results of investigations of oxygen isotopes in boron minerals found in the Kramer Ore Body at various levels are tabulated. Methods for isotopic assay of C and N, O and N, Si and O, and B and O in compounds are discribed. Research on the cohesion in polyatomic many-electron systems and on the nature of chemicals is reported from which it is concluded that the chemical bond owes ...
Date: September 1, 1960
Partner: UNT Libraries Government Documents Department


Description: An investigation of the emission spectrum from radiation-daniaged xylene led to the conclusion that no gross corrections are needed for xylene when used as a scintillation solvent. Data are included from measurements of nonradioactive energy transfer in p-xylene and diphenyloxazole organic scintillation solutions. Measurements were made of the energy resolution of a twinscintillation fast neutron spectrometer. Accurate values of electron drift velocity in purified noble gases and nitrogen were obtained by measuring the transit time of photoelectrons across the gap of a parallel-plate condenser. Information concerning the transport collision cross section of low-energy electrons on noble gases was obtained from drift-velocity data. A method is discussed for the determination of traces of Freon-12 by positive ion emission techniques. Data are reported from late observations of the distribution of radium in the human body; the microscopic distribution of the dose in the skeleton arising from deposited calcium-45, strontium90, and radium-226 as measured autoradiographically; and determinations of individual alpha emitters in mixtures of alpha emitters. Data are tabulated from measurements of gross fission product radioactivity in air samples and in samples of soils collected from August through November 1959. The soil and air fall-out data are discussed. Measurements were made of the total-body gamma ray spectra of 13 unexposed employees chosen as typical of the civilian population of the Chicago area. Measurements were also made of cesium-137 content and cesium-l37/potassium-40 ratios. Data are included from measurements of natural uranium in the lungs of a human. The status is reviewed of a project to study the conditions of persons formerly engaged as radium dial painters and of a project to study the condition of persons who received radium by intravenous administration 21 to 29 years previously. Results are included from a survey of the radioactivity of commercial photomultiplier tubes. The activity induced in ...
Date: October 31, 1960
Partner: UNT Libraries Government Documents Department