Van Nhon, M.; Hong Loan, T.; Ai Khanh, T.; Thien Thanh, T.; Nguyen Phuong, D. STUDY ON THE INFLUENCE OF MULTI-SCATTERING FROM SURROUNDINGS OF HPGE DETECTOR ON ITS GAMMA SPECTRA BY SIMULATION USING MCNP CODE. Science and Technology Development Journal 2008, 11, 66-77.