Speaker
Description
We are developing a new detector concept for simultaneous imaging and spectroscopy of fast neutrons and gammas; it combines a liquid-Xe (LXe) scintillator coupled to a UV-sensitive gaseous imaging photomultiplier (GPM).
The research focuses on validating this new idea for simultaneously detecting concealed explosives, comprising low-Z materials, and high-Z fissile materials, utilizing respectively fast-neutron resonant transmission radiography and dual discrete gamma-ray radiography. Neutron spectroscopy is performed by Time-Of-Flight; gamma-ray analysis requires pulse-height analysis. Imaging of both relies on scintillation-light localization from a liquid xenon (LXe) converter, with a UV-
sensitive, cascaded-THGEM/CsI gaseous photomultiplier (GPM).
The properties of an imaging-GPM, in Ne/CH 4 mixtures at cryogenic temperatures, will be presented. Localization properties will be given for low-energy gammas and fast neutrons, using pad readout electronics, in combination with LXe-filled capillary neutron and gamma-ray converter. The experimental results, obtained with gamma-ray and fast-neutron sources will be compared with that of extended GEANT-4 simulations.
