Browsing by Author "Clayton, E"

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    Application of proton induced x-ray emission to the element analysis of thick obsidian samples
    (Australian Atomic Energy Commission, 1979-11) Duerden, P; Cohen, DD; Clayton, E
    The proton induced x-ray emission (PIXE) technique has been applied to the analysis of element concentrations in obsidian source samples. No target preparation other than washing and the selection of a flat surface was undertaken. Thick target yields have been calculated and element concentrations derived from the detected X-ray spectra; concentrations are given for K, Ca, Ti, V, Mn, Fe, Ga, As, Rb, Sr, Y, Zr, Nb, Ta, and Pb. A pinhole filter is described which enables a single measurement of about 5 minutes duration to give element concentration data over an x-ray energy range 3-20 keV.
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    A comparison of PIXE and neutron activation techniques for thorium and uranium ore analysis
    (Australian Atomic Energy Commission, 1980-04) Cohen, DD; Duerden, P; Wall, T; Clayton, E
    Proton induced x-ray emission (PIXE) and neutron activation analysis (NAA) techniques are used to estimate the concentrations of trace quantities of thorium and uranium in powdered rock or ore samples. The accuracy of the two methods is compared in both a carbon matrix and a variety or ore matrices over the concentration range 1 to 10 000 µg g-1. Under the test conditions the PIXE and NAA concentration estimates for any individual sample in this range are found to be the same within a 3o standard error of 9 per cent.
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    The determination of trace quantities of thorium and uranium in thick ore samples by proton-induced x-ray emission.
    (Australian Atomic Energy Commission., 1979-07) Cohen, DD; Duerden, P; Clayton, E
    Proton-induced x-ray emission (PIXE) techniques have been used to estimate the concentrations of trace quantities or thorium and uranium in powdered rock and ore samples. Standards of known concentrations were prepared in a carbon matrix and the yields from these used to determine simultaneously the concentrations of thorium and uranium in the ore samples. The experimental detection limit of the technique was found to be 3 to 4 µg g-1 for a 100 µC irradiation. The appropriate matrix corrections for a carbon and ore matrix have been calculated for thick targets and taken into consideration.
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    METAPI and SORCE. Two programs to calculate scattering potentials from phase shifts
    (Australian Atomic Energy Commission, 1972-08) Clayton, E
    A description is given of the computer programs MEATPI and SORCE which calculate an effective two body potential. Reaction matrix parameters are calculated in MEATPI from the input phase shifts and SORCE then uses these parameters to generate the potential.
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    Provenance studies of New Zealand obsidian artefacts
    (Elsevier, 1984-04) Duerden, P; Bird, JR; Clayton, E; Cohen, DD; Leach, BF
    A large scale obsidian analysis program at the AAEC Research Establishment uses an automated facility with a multisample capacity and simultaneous PIXE and PIGME measurement. A pinhole filter in front of the PIXE detector ensures that up to 20 element concentrations can be obtained from the samples in a 5 min irradiation. Spectrum analysis and data handling procedures have been set up together with a variety of parametric and non-parametric statistical procedures. The clustering programs have been used with data from a previously measured S. W. Pacific and New Zealand obsidian source collection to identify the origin of artefact material. The example used to illustrate this program is of obsidian artefacts from the Kermadec and Chatham Islands. © 1984 Published by Elsevier B.V.