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X-ray absorbers specialized for some samples, which contain vast amounts of certain elements, have been designed and tried. By means of these absorbers, x-ray spectra in which some distinguished x-ray peaks exist become fairly gentle-sloping over a wide x-ray energy range, and consequently, both sensitivity and efficiency of measurements are fairly improved. Furthermore, these absorbers enable us to analyze all elements simultaneously, to save measuring time and also to improve accuracy of analysis. Transmission curves of these absorbers are determined using techniques developed by us, and the accuracy has been confirmed by analyzing a few standard samples.

About 40 subjects of PIXE have been studied in various research fields at Nishina Memorial Cyclotron Center (NMCC), and many satisfactory results have been obtained and reported. As the results, samples to be analyzed are highly diversified both in form and in elemental composition. Among them, samples most hard to be dealt with by PIXE are ones which contain a great quantity of specific elements. In order to solve this problem, we have developed and tried various absorbers which are specially designed for each kind of sample and are capable of decreasing some distinguished x-ray peak and making x-ray spectra gentle-sloping. It is found that not only the measuring time is fairly shortened but also highly sensitive and highly accurate analysis can be performed for each sample only by selecting absorbers.