Abstract
Two different type of X-ray detectors were used for simultaneous PIXE measurement over a wide element range. One is a pure-Si detector with a thin Be-window, which is to keep high sensitivity for the detection of low Z element. The other is a CZT detector with a thick Be window of 250 μm. It has almost 100% detection efficiency for the X-rays with high energy of up to about 80 keV. By using the CZT detector that was arranged to have a large solid angle, the detection sensitivity of the high energy X-rays of around 30 keV was enhanced by about two orders of magnitude than that by the pure-Si detector. A pair of small permanent magnet was used to sweep away the back-scattered protons from the detector. With this magnet system, the background level in the spectrum of the pure-Si detector was significantly reduced.
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