Jointly published by Elsevier Science S A., Lausanne and Akad~miai Kiad6, Budapest J.Radioanal.Nucl.Chem.,Letters 201 (I) 49-56 (1995) TWO-ENERGY PROTON ACTIVATION ANALYSIS TO DETERMINE SIMULTANEOUSLY THE TRACE ELEMENTS OF NITROGEN AND BORON IN GALLIUM PHOSPHIDE Chih-Hao Lee Department of Nuclear Engineering and Engineering Physics, National Tsing Hua University, Hsinchu, Taiwan, 30045, R.O.C. Synchrotron Radiation Research Center, Hsinchu, Taiwan 30077, R.O.C. Received 28 April 1995 Accepted 10 May 1995 The method of two-energy proton activation analysis was used to determine the concen- trations of nitrogen and boron in gallium phosphide simultaneously. The sensitivity and precision of this method are discussed. In order to achieve the best results in de- termining the concentrations of nitrogen and boron at the same time, the concentra- tion ratio of nitrogen to boron should be within the relative thick yields of boron to nitrogen at these two incident proton energies. INTRODUCTION Charged particle activation analysis is known to be the most sensitive method to determine low-Z trace ele- ments in bulk. To determine a trace concentration of nitrogen and boron in a GaP Sample, several nuclear ac- 0236-5731/95/US $ 9.50 Copyright 9 1995 Akad~miai Kiad6, Budapest All rights reserved 49