عنوان مقاله [English]
Neutron spectroscopy is very important in development of neutron applications. The most commonly used method to measure the neutron energy spectrum is the threshold foil activation method and using an unfolding code such as SAND-II code. The main limitation of this code is that the geometry of the source and measurement setup could not define in the code. In this study, to eliminate this limitation, a new unfolding code has been developed by iterative algorithm in SAND-II and MCNPX code. The full geometry of the measurement setup including the source and foil can be simulated by MCNPX code. In the proposed code, the modified iteration algorithm used in SAND-II is used. The results of the research show that the arrangement of foils in front of the neutron source is effective in the amount of saturation activities of them. Also, using the information obtained by our proposed code, the spectrum unfolded by this code has a good agreement with other neutron spectrum unfolding methods.