We report on the optical readout of the gas electron multiplier (GEM) operated with a gaseous mixture suitable for the detection of thermal neutrons: 3 He-CF 4 . A CCD system operating in the 400-1000 nm band was used to collect the light. Spectroscopic data on the visible and NIR scintillation of He-CF 4 are presented. Images of the tracks of the proton and triton recorded with a triple GEM detector are also shown. r
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