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  • Author or Editor: R. Vis x
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Abstract  

The possibility to use proton induced X-ray fluorescence in trace analysis is investigated. Sensitivities and detection limits for elements from Z=24 are determined. The influence of a NaCl matrix on these parameters is measured and some possibilities are given to use the technique in analytical practice.

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Abstract  

Using activation by 16 MeV α-particles quantitative analysis has been carried out for P and Cl in natural waters with a reproducibility of ±5%. Limits of detection of 0.1 and 0.4 ppm were obtained for the two elements, respectively. The method is applied to the determination of P and Cl in water samples taken in the environment of Amsterdam.

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Abstract  

Proton induced X-ray emission (PIXE) is used in an attempt to identify glass samples with the aid to determine, trace element concentrations. The elements Na and A1 are simultaneously determined using the (p, p' γ) nuclear reaction. The preparation of very thin and homogeneous glass targets is discussed and a procedure is described to obtain an accurate equipment calinration, checked afterwards with NBS bovine liver. Results are given for 11 different glass samples.

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Abstract  

By spiking the samples with a compound containing both a non-analyte and an analyte element, to which a relative deceleration property for 5 Me V protons has been ascribed, relative deceleration values for the samples could be obtained by measuring the prompt -yields induced in the non-analyte element. These values are used to correct for matrix effects in elemental analysis using PIGE techniques. In addition to this, the analytical results thus obtained can also be compared to those obtained by the simultaneous application of the analyte spiking technique to the collected yield data. These non-analyte spiking approaches were used to analyze silicon in polymer materials. These methods were tested by analyzing the two reference standards BCS 308 and Standard Chrome Ore XXXI. Li2SiO3, containing both the non-analyte as well as the analyte element, was selected as comparator and spike. Results obtained for the polymer samples were also compared to those obtained by PIXE.

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Abstract  

A homemade modular PC-controlled radiochemistry system, used to separate the no-carrier-added 64Cu from irradiated electroplated solid cyclotron target 64Ni layers was developed. Upon irradiation the target layer is dissolved in diluted nitric acid, followed by selective liquid–liquid extraction of the 64Cu. The final purification step is achieved making use of an anion exchange column. All the separation procedures can be carried out remote-controlled with a minimized risk of operator errors within less than 2 h, with excellent processing yield (>95%).

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