Results 181 to 190 of about 277,971 (217)
Some of the next articles are maybe not open access.
Nuclear alignment in isotopes of cobalt
Physica, 1952Synopsis A significant anisotropy of γ radiation from aligned Co 60 nuclei has been detected. From the variation of the anisotropy with temperature a value for the magnetic moment can be determined: this is 3.5 ± 0.5 nuclear magnetons and is consistent with the Schmidt limit of 3.8 based on nuclear shell model assignments. Similar investigation of Co
M.A. Grace, H. Halban
openaire +1 more source
Determination of Small Amounts of Cobalt Using Isotope-Dilution with Cobalt-60
Analytical Chemistry, 1961Trace amounts of cobalt are determined in vitamin B/sub 12/ and biological materials by an isotope-dilution technique combined with a spectrophotometric method. Interference due to copper is overcome by reduction with metallic iron. The procedure employs Co/sup 60/ as the tracer. (auth)
J. T. Byrne, G. A. Rost
openaire +1 more source
Isotope effect and self-diffusion in face-centred cubic cobalt
Physica Status Solidi (a), 1979Self-diffusion in cobalt is investigated from 896 to 1745 K by means of the standard radio-tracer method using lathe sectioning in the paramagnetic and sputter sectioning in the ferromagnetic region. The diffusion coefficients vary between about 10−17 cm2 s−1 and 10−9 cm2 s−1; their temperature dependence can be described by DT = 0.55 exp (−2.99 eV/kT)
W. Bussmann +4 more
openaire +1 more source
A Novel Technique to Determine Cobalt Exchangeability in Soils Using Isotope Dilution
Environmental Science & Technology, 2007The environmental risk posed by Co contamination is largely a function of its oxidation state. Our objective was to assess the potential biological availability of Co and the reactions and fate of soluble Co(II) after addition to soils with varying physical and chemical characteristics.
Wendling, Laura A. +2 more
openaire +5 more sources
The movement of cobalt and zinc in soils as indicated by radioactive isotopes
Australian Journal of Agricultural Research, 1957A method has been developed whereby labelled cobalt and zinc were applied to the surface of columns of soil in order to study the movement of these cations under the influence of rainfall and various fertilizer treatments. The results of the investigation demonstrate that in soils of moderate exchange capacity, whether this is provided by clay or by ...
GH Jones, DS Riceman, JO McKenzie
openaire +1 more source
Beta decay of neutron-rich cobalt and nickel isotopes
Exotic nuclei and atomic masses (ENAM 98), 1998We report on the first β-γ spectroscopy measurements of the neutron-rich 68–70Co and 70–74Ni nuclei, produced in proton-induced fission of 238U and ionized in a laser ion guide coupled to an on-line mass separator. Several γ lines from the decay of these nuclei have been identified, half-lives determined and production cross sections deduced.
S. Franchoo +17 more
openaire +1 more source
The isotopically exchangeable form of native and applied cobalt in soils
Australian Journal of Soil Research, 1969The experimental conditions and precision of alternative methods of measuring isotopically exchangeable cobalt (Coi.e) were investigated. The values of Coi.e varied from 0.16 to 5.4 p.p.m. for 25 soils and were highly correlated with the sum of cobalt extracted by ammonium acetate and subsequently by quinol, and the relationships between these forms ...
KG Tiller, JL Honeysett, EG Hallsworth
openaire +1 more source
Radiochemical separation of cobalt by isotopic exchange
Talanta, 1964Abstract The radiochemical separation of cobalt by an isotopic exchange technique has been evaluated for an aqueous 0.5 M oxalic acid system. The optimised procedure requires 6 min for the entire separation and gives cobalt yields of more than 83%.
openaire +1 more source
Determination of Small Amounts of Cobalt by Isotope Dilution Analysis
Analytical Chemistry, 1962Isotope dilution analysis is combined with solvent extraction and spectrophotometry to produce an effective general method for the determination of constituents that are not extracted quantitatively. Combining isotope dilution with extraction of the cobalt-- 2-nitroso-1-naphthol complex into chloroform results in an accurate and reliable method for the
W. D. Ralph, T. R. Sweet, Inara Mencis
openaire +1 more source
Lead-isotope study of mineralization in the Cobalt district, Ontario
Canadian Journal of Earth Sciences, 1986Twenty-seven lead-isotope analyses for galena specimens from 14 localities in the Cobalt district represent sulphide-rich interflow sedimentary units in the Archean volcanic sequence, mineralized zones, fracture fillings, and local sulphide concentrations in the Cobalt Group (Proterozoic) sedimentary rocks, and vein-filling and breccia-cementing ...
R. I. Thorpe +3 more
openaire +1 more source