A New Multi-Layer Scintillation Detector for Detection of Neutron-Gamma Radiation

We present the results of our experimental and theoretical studies of fast neutron detection efficiencies of a newly-developed multi-layer scintillation detector comprised of a series of alternating layers of a composite inorganic scintillator material and an optically transparent plastic scintillator material (brand ZEBRA). We investigated the response of this type of detector to neutrons from Pu-239-Be and Cf-252 sources. We evaluated the sensitivity of such ZEBRA detectors as a function of different thicknesses of the alternating layers of composite scintillator and light guides to optimize the performance of these structures. We compared the detection efficiency of these detectors with detectors based on the single crystals ZnSe, ZWO and GSO. We also analyzed the detection sensitivity of these crystal scintillation detectors as a function of thickness and cross-sectional area of the detection material. Finally, we created software that permits the achievement of a high level (up to 104) suppression of gamma-radiation from both accompanying and other external gamma-radiation.