APPLICATION OF A DEFLECTOR-DETECTOR SYSTEM FOR RBS ANALYSIS

Jozef Dobrovodský - Peter Kováč - Stanislav Stanček

   In RBS analysis quite often only the high-energy part of the recorded spectrum is of interest, eg in the analysis of trace amounts of heavy elements in the near surface region of a light substrate. The speed of data recording and therefore the detection limit of standard RBS analysis is limited by the pulse pileup effects due to the high counting rates of the signal from the thick substrate material. We present a new approach to RBS spectroscopy, which results in a pileup-free high-energy region of the acquired RBS spectrum. This can be done by preventing backscattered low energy particles from hitting the detector. For this purpose an electrostatic deflector-detector system has been developed. The theoretical considerations leading to its proper design are outlined. The first results of the performance of this cost-effective solution are presented.

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