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[References: 12 tit.]

In this paper, a simulations using MCNP code were carried out to determine the behavior and the response of a highly sensitive silver-activation detector which used for neutron detection. The detector consists of sandwiched alternating thin-sheets of silver and plastic scintillator EJ-299-15 instead of NE-110. The simulations also tacked into account two mono-energy neutrons 2.5 and 14 MeV to get the most efficient design of detecting and registering signals due to fast-neutrons interactions with the active materials (silver) and the plastic scintillator EJ-299-15. The energy and charge deposition of neutrons, photons and electrons at the detection-cell were simulated for different situations. The output simulations showed a valuable and promising ways to maximize optimization of designing and building such detectors suitable for a wide range of monitoring and detecting neutron sources.