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  • Author or Editor: S. Al-Jobori x
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Abstract  

A method is described for determining impurities in Zr-2 and Zr-4 clads by means of instrumental neutron activation analysis followed by high resolution gamma-ray spectrometry. The samples were irradiated in IRT-5000 using vertical channels and a pneumatic system with neutron fluxes of about 3·1013 and 4.8·1011 n·cm–2·s–1, respectively, and counted using Ge(Li) detectors coupled to an on-line computer. The following impurties have been determined Al, Cr, Mn, Fe, Co, Ni, As, Sn, Sb, Hf and W.

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Abstract  

Fourty three phosphorite rocks from Western Iraq were analyzed for eleven REE as well as uranium by NAA using IRT Reactor with a neutron flux of 2.3·1013 n·cm–2·s–1. The gamma activity from each sample was counted with a Ge(Li) and well-type HPGe, each detector connected to an on-line computer. Uranium fission products and different reaction interferences were assessed and allowed for. The results were also checked against international reference materials.

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Abstract  

An X-ray spectrometric method independent of the matrix composition has been developed for the determination of S and Cl in the case of overlapping peaks. The principle of the methods is based on the observation that the sum of the peak areas from S and Cl is independent of their concentration ratios, only the different sections of the peak depend on these values. Using this method the sulphur and chlorine contents have been determined for crude oil samples collected from different geographical regions.

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Abstract  

Concentrations of Al, Br, Ca, Ce, Co, Cr, Eu, Fe, Hf, La, Lu, Mg, Mn, Na, Rb, Sc, Sm, Sr, Tb, Th, Ti, V, Yb, Zn, and Zr have been measured in Tigris and Euphrates river water, using neutron activation analysis in combination with preconcentration technique. River water samples were preconcentrated by evaporation at 70°C under atmospheric pressure. The samples with standard reference materials were irradiated with a neutron flux of 2.3·1013 n·cm–2·s–1.

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Abstract  

Fast neutron activation analysis technique was applied for the determination of Si, Al, Ti, Fe and Zr in glass sand rock samples. The samples and standards were irradiated with a mono-energetic neutron flux of 108n · cm · s–1. Pneumatic facility was used. The gamma activities from samples and standards were counted using a 30 cm3 Ge(Li) detector, with FWHM of 2.9 keV at 1.332 MeV, coupled to an on-line computer facility.

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Abstract  

Instrumental neutron activation analysis technique was applied for the determination of 20 elements in 54 silicate rock samples which belong to three sedimentary geological formations located in the western desert of Iraq. The samples along with USGS standards were irradiated in an IRT-5000 reactor at a neutron flux of 3.7·1013 n·cm–2·s–1 The following minor and trace element constituents have been determined: Na, K, Ca, Fe, Sc, Cr, Co, Zr, Ce, La, Nd, Sm, Eu, Tb, Yb, Lu, Hf, Ta, Th and U.

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Abstract  

Rock samples which contain relatively high concentrations of uranium may create problems of interference produced by fission products, when instrumental neutron activation analysis is used. The isotopes95Zr,140La,141Ce, 143Ce and 147Nd, which are commonly used in the neutron activation analysis of the corresponding elements, are also produced as fission products of235U. For each of these radioisotopes, a contribution factor is calculated theoretically and meaured experimentally using geological samples with different uranium contents.

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Abstract  

The concentrations of O, Na, Cl, V, Mn and Ni in crude oils of different origins were determined, using sampling (SNAA) and on-stream (ONAA) activation analyses. Samples were irradiated with thermal and fast neutrons produced by a 0.3 mg252Cf source and a 14 MeV generator. The H-content and the C/H atomic ratio have been determined by thermal neutron reflection method using an 18 GBq Pu−Be source.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: R. Itawi, S. Al-Jobori, M. Jalil, S. Farhan, A. Mheemeed, Kh. Saaeed and E. Ahmed

Abstract  

Eleven food colouring substances are analyzed for their elemental content by the method of instrumental neutron activation analysis, and the concentrations of fourteen elements present in these samples are presented.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: R. Itawi, S. Al-Jobori, M. Jalil, S. Farhan, A. Mheemeed, Kh. Saaeed and E. Ahmed

Abstract  

Thirteen textile dyes have been analyzed by the method of insturmental neutron activation analysis for their components of major and trace elements, and the concentration of thirteen elements in these samples are presented.

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