| 1. |
- Abdel-Khalek, Ahmed A., et al.
(författare)
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Chemical Studies on Uranium Extraction from Concentrated Phosphoric Acid by Using PC88A and DBBP Mixture.
- 2011
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer. - 0236-5731 .- 1588-2780. ; 290, s. 353-359
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Tidskriftsartikel (refereegranskat)abstract
- Liquid–liquid extraction of U (VI) from concentrated phosphoric acid by using (2-ethyl hexyl) phosphonic acid, mono (2-ethyl hexyl) ester (PC88A) and di-butyl butyl phosphonate (DBBP) has been investigated. The effect of different factors affecting the extraction process (PC88A concentration, DBBP concentration, shaking time, aqueous/organic phase ratio, phosphoric acid concentration and effect of diluents) have been investigated. The obtained data of temperature on the extraction showed that the enthalpy change is −17.15 kJ mol−1. Uranium was extracted from the strip liquor by using di (2-ethylhexyl) phosphoric acid and tri-octyl phosphine oxide mixture and finally converted to a high purity UO3 product using precipitation with hydrogen peroxide and heat treatment at 365 °C.
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| 2. |
- Al-Jobori, S. M., et al.
(författare)
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Analysis of natural milk and milk powder samples by NAA
- 1990
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - 0236-5731 .- 1588-2780. ; 144:3, s. 229-239
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Tidskriftsartikel (refereegranskat)abstract
- As a part of the Iraqi Food'Analysis Programme /I.F.A.P./ the concentrationof Na, Mg, P, CI, K, Ca, Zn, Se, Br, Rband I in natural milk collected from different regions of Iraq, and in milkpowder samples have been determined byusing the NAA technique. It was found that except for the elements I, Rb and Br the concentration of the elements was approximately identical in both the natural milks and milk powders.
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| 3. |
- Al-Jobori, S.M., et al.
(författare)
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Determination of major, minor and trace elements in Iraqi vegetabel samples by INAA
- 1992
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - 0236-5731 .- 1588-2780. ; 159:1, s. 29-36
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Tidskriftsartikel (refereegranskat)abstract
- Vegetable samples collected from different locations in Iraq have been analyzed by the method of instrumental neutron activation analysis for the determination of its content of major, minor and trace elements. Twenty types of vegetables have been analyzed and the concentrations of sixteen elements are presented.
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| 4. |
- Aldahan, Ala, et al.
(författare)
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Particle-bound Be-10 from a low latitude arid region
- 2014
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 299:3, s. 1709-1713
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Tidskriftsartikel (refereegranskat)abstract
- The Be-10 isotope is widely used in geochronology, climate and environmental analyses and astrophysics where atmospheric deposition model estimate plays a vital role for the initial concentration. Data from arid regions have not been well constrained because of sparse measurement and here we present Be-10 concentration in samples of dust, soil, marine sediments and paleosol collected from an arid to semi-arid low latitude region. These results indicate concentrations that are about a factor of three lower than values expected from latitude zonal models, but are comparable with global atmospheric depositional model. The agreement and discrepancy between model and measured data are rather vital for establishing accurate initial Be-10 in the Earth's surface environment for reconstruction of paleoclimatic variability (precipitation rates and temperature).
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| 5. |
- Alshamsi, Dalal M., et al.
(författare)
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Uranium isotopes in carbonate aquifers of arid region setting
- 2013
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 298:3, s. 1899-1905
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Tidskriftsartikel (refereegranskat)abstract
- Groundwater in arid and semiarid regions is vital resource for many uses and therefore information about concentrations of uranium isotopes among other chemical parameters are necessary. In the study presented here, distribution of U-238 and U-235 in groundwater of four selected locations in the southern Arabian peninsula, namely at two locations within the United Arab Emirates (UAE) and two locations in Oman are discussed. The analyses of the uranium isotopes were performed using ICP-MS and the results indicated a range of concentrations for U-235 and (238) U at 3-39 ng L-1 (average: 18 ng L-1) and 429-5,293 ng L-1 (average: 2,508 ng L-1) respectively. These uranium concentrations are below the higher permissible WHO limit for drinking water and also comparable to averages found in groundwater from similar aquifers in Florida and Tunisia. Negative correlation between rainfall and uranium concentrations suggests that in lithologically comparable aquifers, climate may influence the concentration of uranium in subtropical to arid regions.
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| 6. |
- Aneheim, Emma, 1982, et al.
(författare)
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Astatine-211 labeling: a study towards automatic production of astatinated antibodies
- 2015
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 303:1, s. 979-983
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Tidskriftsartikel (refereegranskat)abstract
- Targeted alpha therapy is especially interesting for therapy of microscopic cancer tumors due to short path length and high linear energy transfer of the alpha particles. One of the most promising nuclides for targeted alpha therapy is At-211. To facilitate larger clinical studies using At-211, the current manual synthesis of radiolabeled antibodies would benefit from being transferred into an automated method. In this work, successful modifications of the manual synthesis have been performed in order to adapt it to automation. The automatic synthesis has also been tested using the modified synthesis method.
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| 7. |
- Aneheim, Emma, 1982, et al.
(författare)
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Technetium chemistry in a novel group actinide extraction process
- 2013
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 296:2, s. 743-748
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Tidskriftsartikel (refereegranskat)abstract
- A newly developed method for advanced reprocessing of used nuclear fuel is the Group ActiNide EXtraction (GANEX) process. It is a liquid-liquid extraction process that aims at extracting all the actinides as a group from dissolved used nuclear fuel. This extraction can either be performed after a removal of the bulk uranium or directly on the dissolution liquor. At Chalmers University of Technology in Sweden a solvent that utilizes tributyl-phosphate (TBP) and a molecule from the bis-triazine bipyridine (BTBP) class of ligands dissolved in cyclohexanone has been developed for the use in a GANEX process. Previously the system has not been tested with the presence of technetium that is one of the major fission products. Technetium is often considered a problem within reprocessing since it has a chemical behaviour that differs from most other elements in the spent fuel. Therefore, a special emphasis was put on the investigation of technetium in the selected GANEX system. It was shown that technetium is readily extracted by the GANEX solvent and that cyclohexanone is the main extractant when no other metals were present in the system. It was also found that the presence of uranium decreased the overall technetium extraction despite a slight co-extraction with TBP, while irradiation of the GANEX solvent to large doses ([>1 MGy) increased its technetium extraction capability. It was also discovered that an increased nitrate concentration in the aqueous phase and an addition of other fission products both inhibited the technetium extraction even though fission product loading most likely changed the extraction mechanism to co-extraction by BTBP.
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| 8. |
- Bartos, B., et al.
(författare)
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Ru-103/Rh-103m generator
- 2009
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Science and Business Media LLC. - 0236-5731 .- 1588-2780. ; 279:2, s. 655-657
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Tidskriftsartikel (refereegranskat)abstract
- Rh-103m is a very promising radionuclide for Auger electron therapy due to its very low photon/electron ratio. The goal of the present work was the elaboration a method for production of large quantities of Rh-103m for generator system. It was found that the combination of solvent extraction with evaporation of (RuO4)-Ru-103 followed by decomposition of H5IO6 makes it possible to produce Rh-103m of high radionuclidic and chemical purity.
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| 9. |
- Bian, Wenjie, et al.
(författare)
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Diffusion behavior of Se(IV) and Re(VII) in biotite: effects of dry density and ionic strength
- 2023
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Ingår i: Journal of Radioanalytical and Nuclear Chemistry. - : Springer Nature. - 0236-5731 .- 1588-2780. ; 332:11, s. 4413-4425
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Tidskriftsartikel (refereegranskat)abstract
- Biotite is an important adsorption carrier in the constituent minerals of Beishan granite. In this work, the effects of compaction density and ionic strength on the diffusion behavior of Se(IV) and Re(VII) in biotite were studied by capillary in-diffusion method and diffusion cell through-diffusion method. When the compaction density decreases or the ionic strength increases, the apparent diffusion coefficient increases, and its values range between 10–11 and 10–9 m2/s. The relationship between De and εacc, ionic strength and εacc was fitted using Archie's law and compared with the parameters of other researchers.
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| 10. |
- Blomberg, M, et al.
(författare)
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Archaeoastronomy: New trends in the field, with methods and results from studies in Minoan Crete
- 2001
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Ingår i: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY. - : KLUWER ACADEMIC PUBL. - 0236-5731. ; 247:3, s. 609-619
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Tidskriftsartikel (refereegranskat)abstract
- We describe briefly new trends in archaeoastronomy and present results from our studies on Crete to show what this field can contribute to archaeological investigations in the Bronze Age Aegean. Our basic method is the study of orientations, but contempor
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