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  • Author or Editor: M. Misdaq x
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Abstract  

Uranium and thorium contents were evaluated in water samples collected from different sources of the piedmont of the Middle Atlas mountains by using two types of solid state nuclear track detectors (SSNTD). In addition, the radon (222Rn) and thoron (220Rn) -activities per unit volume of the water samples were also determined. The influence of the water flow rate and altitude on the radon concentration of the water samples belonging to the piedmont of the Middle Atlas mountains was investigated. The hydraulic exchanges between the Middle Atlas water reservoirs and the Turonian aquifer of the neighbouring Tadla plain have been quantified. The results were compared with data given in literature.

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Abstract  

Gamma-ray self-absorption in stainless steel samples has been studied with an experimental method based on fast neutron activation and a Monte Carlo calculation technique adapted to the experimental conditions. A relation between self-absorption and absorption of -photons inside stainless steel samples was found. The influence of the -ray energy and sample depth have been investigated. Agreement between the two methods has been found.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: M. Misdaq, G. Blondiaux, N. Bordes, A. Giovagnoli, M. Valladon, L. Wei, M. Hage Ali, C. Maggiore, and J. Debrun

Abstract  

Several examples of improvements or of new developments in the field of charged particle activation analysis applied to the study of semiconductors are described: determination of carbon at the sub-ppb level in GaAs, use of 20 to 30 MeV protons for trace analysis in InP, study of radioactivation with 12 MeV tritons, and use of channeling to study the lattice location of carbon atoms at trace level in GaAlAs.

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Abstract  

The uranium and thorium contents were evaluated in the 100–400 µm granulometric fraction of different sedimentary phosphate samples by using a method based on determining the mean critical angles of etching of the CR-39 and LR-115 type II solid state nuclear track detectors (SSNTD) for detecting -particles emitted by the nuclei of the uranium-238 and thorium-232 series. Data obtained were compared with the results of -ray spectrometry measurements performed on the same samples. The influence of the calcination and water washing treatments as well as the lithology and stratigraphy on the uranium concentration of the phosphate samples was investigated.

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