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  • Author or Editor: R. Schmitt x
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Abstract  

Sodium contents in seven mixtures of biological materials from varying aliquants of wheat flour and oyster tissue were analyzed using the INAA (instrumental neutron activation analysis) method. The samples were activated in the thermal column (TC) of the 1 MW TRIGA reactor at our laboratory. To analyze and compare the measured results, the ratioa of the epithermal neutron flux to the thermal neutron flux was determined in the TC, the rotating rack (RR) and the pneumatic terminal (PT). Due to the negligible interferences of24Mg(n, p)24Na and27Al(n, )24Na to23Na(n, )24Na, the Na results were obtained with 97% accuracy and 99% precision. It is shown that the method is suited for accurately determining Na contents in 12 various biological materials, especially for the samples that are low in Na content. From the cadmium ratio measurements of Au (4.9 eV resonance of198Au) and Sm (8 eV resonance of153Sm), ratios ofa e/ 0 were determined at 0.0011, 0.052 and 0.053 in the TC, RR and PT activation positions, respectively.

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Abstract  

A computer program infortran iv is presented for the determination of peak location, peak areas and elemental abundances of γ-ray spectra.

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Abstract  

Representative samples of five major races of Ustilago scitaminea, the causal organism of the smut disease of sugarcane, were obtained from infected sugarcane fields in the western hemisphere. The variations in concentration of 10 elements (Na, Mg, Al, Cl, K, Ca, Mn, Fe, Co, and Zn) in the sporidial yeast-like cells of this fungal pathogen were analyzed by neutron activation analysis. Comparative analysis of the elemental compositions in the different races of the fungus showed that the five pathogenic races of Ustilago scitaminea may be distinguished from each other on the basis of elemental compositions.

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Abstract  

The concentrations of seventeen elements in two species of fungus which cause wheat bunt disease,Tilletia caries (DC.) Tul. andTilletia controversa Kühn, were determined by instrumental neutron activation analysis. Differences in the K and Cl concentrations between these two species of spores are large and therefore can be used as a criterion for distinguishing between the two species of fungus.

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Abstract  

A 35 MeV linear electron accelerator is used to investigate how far photon activation analysis can be used within the broad spectrum of analytical methods applied in BAM. The irradiation facilities are described. Examples are given for the application of PAA in the analysis of oxygen in metals and compared with conventional heat extraction and other nuclear analytical methods. It is further shown that PAA is a very useful tool for the analysis of traces of noble metals in Cu compared with other methods. Finally the possibilities of PAA in the field of multielement analysis are demonstrated taking ancient roman potsherds and bronze as examples. The results are compared with those of XRF and AAS. It is concluded that PAA is a valuable tool in the analysis of light elements with at least partly unique possibilities, that it can serve as an independent method for the certification of Reference Materials in many cases and that PAA can be very useful applied for multielement analysis.

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