Development of a UV/X-Ray Imaging Device Based on Large Areagas Photo-Multipliers

Anew type high spatial resolution radiation detector based on UV scintillators + UV imaginggas photomultiplier is presented. The prototype UV detector consists of a 10cm×10cm μPIC,2GEMs,aUV transparent windowandaCsI photocathode deposited on the window or the surface of the upper GEM. The effective photo-sensitive area is ø34mm andthe readouts are 400um-pitch strips.Anewlydeveloped LuLiF4(Nd) crystal which emits 183nm photonsis directly coupled to the detector as the window. The detector was tested in pulse mode operation with 5.5MeV α particles from 241Am and 122keV γ rays from 57Co. The window images were clearly obtained and the position resolution of o(mm) is confirmed.