Orthogonal Strip TlBr Detectors for PET

Energy and timing resolution were measured simultaneously in an orthogonal strip thallium bromide (TlBr) detector of 0.6 mm thickness. The energy resolution achieved in 0.5 mm wide strips at room temperature and at -300 V was 6.1% at 511 keV. A significant improvement of the timing resolution was observed when an energy cut was applied to only include the highest energy events. The best timing resolution achieved was 23 ns FWHM.