Abstract
Abstract In order to prevent the illicit traffic of radioactive and special nuclear materials, radiation portal monitors are normally used, for the detection of gamma-rays and neutrons. Helium-3-based technology is commonly used for neutron detection, but the world is facing a shortage of this isotope. The large size and weight of the neutron detection system (gas volume and needed moderator material) make it very difficult to use in mobile applications. In this study, a lightweight, compact, portable, and low power neutron detection system EJ-426HD plastic scintillator with a silicon photomultiplier readout is presented. Innovative solutions for prototyping of moderator materials using 3D printing and the use of an embedded detector in modular sheets were compared with Monte Carlo simulations. Experimental tests using the developed neutron detection system (modular sheets) and an americium-241:beryllium source showed improvements on the detection efficiency in the range 12–79% changing the moderator and reflector sheets.KeywordsPortable radiation detectorsSilicon photomultipliersPlastic scintillatorsNeutronsSecurityDefense
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