Cs2LiYCI6:Ce 3+ (CLYC) is a new inorganic scintil lator that has recently garnered attention for its ability to detect and discriminate between gammas and thermal neutrons. While scintilla tors are typically coupled to traditional photomultiplier tubes for data acquisition, this setup may not be feasible in aU applications. Solid state photomultipliers offer potential advantages including smaller size, added robustness, no high voltage requirement, and imperviousness to magnetic fields. We investigate the waveform structure of CLYC emission when coupled to a SensL silicon photomultiplier and a Hamamatsu multi-pixel photon counter. We report on the ability to provide pulse-shape discrimination for gamma and thermal neutron separation.
A rotational modulator (RM) gamma-ray imager is capable of obtaining significantly better angular resolution than the fundamental geometric resolution defined by the ratio of detector diameter to mask-detector separation. An RM imager consisting of a single grid of absorbing slats rotating ahead of an array of a small number of position-insensitive detectors has the advantage of fewer detector elements (i.e., detector plane pixels) than required by a coded aperture imaging system with comparable angular resolution. The RM therefore offers the possibility of a major reduction in instrument complexity, cost, and power. A novel image reconstruction technique makes it possible to deconvolve the raw images, remove sidelobes, reduce the effects of noise, and provide resolving power a factor of 6 -8 times better than the geometric resolution. A 19-channel prototype RM developed in our laboratory at Louisiana State University features 13.8• full-angle field of view, 1.9• geometric angular resolution, and the capability of resolving sources to within 35 ′ separation. We describe the technique, demonstrate the measured performance of the prototype instrument, and describe the prospects for applying the technique to either a high-sensitivity standoff gamma-ray imaging detector or a satelliteor balloon-borne gamma-ray astronomy telescope.
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