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Analysis of contaminants in high purity refractory metals such as W or Mo is a difficult analytical task and cannot be accomplished by dissolution methods owing to high contamination risk. A slurry sampling AAS method was developed and validated using a large number of reactor irradiated nuclides [2]. 1–1 µg of each element. After the measurement of the initial activity, the cup was inserted into the atomizer head. The mixture was Part II 45 Krivan and Rossbach carefully dried and then pyrolized.

How to solve the problem? XRF spectrometers (Fig. 2) consist of a source of excitation radiation (an X ray tube for fixed systems or a radioisotope for portable systems), a radiation detector to detect the stimulated radiation from the sample and a display of the spectral output. In portable systems, built-in isotope identification software helps in comparing the wavelength of the stimulated X rays with known data. For further analysis, computers often are used. , RINDBY, A. (Eds), Microscopic X-Ray Fluorescence Analysis, Wiley, Chichester (2000).

One of the candidates to serve as such a probe is the neutron. The neutron seems to be a unique probe for practical analysis, but conventional instrumental neutron activation analysis is unsuitable because normally the amount and size of the sample are limited owing to the need to insert the sample into a reactor. Recently the method of neutron capture prompt g activation analysis (PGAA) has been more widely studied, with the installation of sophisticated neutron guide tubes at various nuclear reactors.

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