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Gamma-ray signatures are generally used for detecting nuclear materials. It is difficult to distinguish gammas from backgrounds and innocent radiological materials, which can result in high false alarm rate. Dual neutron-gamma detectors for detecting illegally trafficked nuclear materials have a potential to reduce the false alarm rate. Elpasolite scintillator Cs2LiYCl6 (CLYC) doped with Ce3+ presented...
A promising composition, Ce doped Cs2LiYBr6 (CLYB) originally introduced by van Loef et al. has been investigated recently as a gamma-ray and neutron detector. It belongs to the elpasolite family and has a cubic structure. A single crystal of this material has been grown using the vertical Bridgman method. Scintillation properties such as energy resolution, emission, light yield, non-proportionality,...
Recently a number of alkaline earth halide scintillators doped with Eu2+ have been reported on. They are characterized by very good proportionality, high up to 100,000 photons/MeV light yield, and very good energy resolution, as low as 2.8% at 662 keV. Yet, one of the issues facing these materials is radiation trapping. Radiation trapping results from a small Stokes shift that creates considerable...
The detection of illicit nuclear sources and SNM requires a ubiquitous network of sensors. While 3He proportional counters are excellent neutron detectors, there is an insufficient global supply of 3He to create the required number of detectors. Alternatives to 3He must be efficient, insensitive to gamma radiation, easily manufactured, rugged, and inexpensive to enable the procurement of a large numbers...
It is well known that periodical poling of ferroelectrics crystals cannot modulate the intrinsic third order nonlinearity. We report that it can however modulate the effective nonlinearity due to cascaded quadratic processes in PPLN crystal.
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