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  • Author or Editor: G. Beurton x
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Abstract  

N, O, F, P, S, Cl can be mixed with aluminium during electrolysis, alloying operations and surface treatments. These elements allow changes in mechanical properties. We have adapted separation methods to neutron activation analysis of aluminium alloys down to the sub—ppm level. N, F, Cl, determinations need distillation. S and P separations are based on liquid extraction. O determination is carried out by instrumental method. Tracers and inactive carriers are used for separation study. Clearning of the surface is performed if necessary. 14 MeV neutron activation is applied to nitrogen, oxygen and fluorine determination. The sensitivity is about 200 imp/min/mg. Reactor neutron activation is performed for phosphorus, sulfur and chlorine analysis. The detection level is 0.1 μg/g. Interesting differences of N, O, F, and Cl contents are observed for Al−Zn or Al−Cu alloys in the range 0.1–10 μg/g.

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Abstract  

With the purpose of providing a quick method directly suitable for oxygen determinations in various metals, the factors influencing accuracy and sensitivity of the16O(n, p)16N reaction have been investigated. The interferences caused by B, F and N have been studied. Pile-up effects and surface contaminations were lowered and matrix effects calculated. The background noise was kept at a minimum. The critical level of oxygen detection corresponds to 3 μg. The experimental procedure is useful down to the sub-μg/g level for oxygen determinations in metals and alloys.

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Abstract  

Activation analysis with reactor neutrons is used as a complement to the chemical methods for the fabrication of standard materials or for the determination of rraces in non-ferrous metals. The 14 MeV neutrons are used to determine oxygen in metals. Finally, certain problems such as the determination of F in salts, Si in Al−Si alloys or B in the AT5B alloy can be solved by using the neutrons from an isotopic source.

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Abstract  

Neutron activation analysis and radiochemical separations in HCl, HF media are used to determine 30 elements in aluminium and alloys. Amounts lower than 1 μg of element may be determined. A good agreement is found with the results of atomic absorption spectrometry. This procedure is applied routinely for determinations of trace elements or major components.

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