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								. XIA Jia-Wen et al. Nucl. Instr. Methods, 2002, A488:11—252. XIA Guo-Xing et al. Nucl. Instr. Methods, 2003, A508:239 
. XIA Jia-Wen et al. Nucl. Instr. Methods, 2002, A488:11—252. XIA Guo-Xing et al. Nucl. Instr. Methods, 2003, A508:239