Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

Abstract Dual particle imaging, in which both neutrons and gamma-rays the environment can be individually characterized, is particularly attractive for monitoring mixed radiation emitters such as special nuclear materials (SNM). Effective SNM localization detection benefits from high instrument sensitivity so that real-time imaging or with a limited number of acquired events enabled. For portable applications, one also desires dual imager (DPI) readily deployable. We have developed hand-held type DPI equipped pixelated stilbene-silicon photomultiplier (SiPM) array module low sampling-rate analog-to-digital converters (ADCs) processed via multiplexed readout. The stilbene-SiPM (12 × 12 pixels) capable effectively performing pulse shape discrimination (PSD) between gamma-ray neutron neutron/gamma-ray source on plane, demonstrated 252 Cf neutron/gamma 137 Cs sources. sampling rate ADCs connected to result compact provides image source, producing 6.4 μR/h at 1 m, less than 69 s. A 3.5 10 5 n/s obtained 6 min m center system. images successfully field view 50° angular resolution 6.8°.