A new type high spatial resolution radiation detector based on a UV scintillator+a UV imaging gas photomultiplier is presented. The prototype UV detector consists of a 10 cm x 10 cm mu PIC, 2 GEMs and a semitransparent Csl photocathode deposited on a MgF2 window. The effective photo-sensitive area is phi 34 mm and the readouts are 400 mu m pitch strips. A newly developed 20 mm size LaF3(Nd) crystal which emits 172 nm photons is coupled to the detector for the first step. The detector was tested in pulse mode operation with 5.5 MeV alpha particles from Am-241. The single photoelectrons were successfully detected and the images of the crystal shape were clearly obtained. (C) 2010 Elsevier B.V. All rights reserved.