A detector component for an X-ray or gamma ray detector, the detector component comprising: a scintillating crystal having a plurality of scintillating crystal pixels forming a crystal array, wherein each scintillating crystal pixel is larger in one dimension than in the other two dimensions, and wherein each scintillating crystal pixel has more than one light exit faces; and an array of photodetectors, wherein a photodetector is associated with a light exit face of each scintillating crystal pixel, wherein a first and a second scintillating crystal pixel are arranged adjacent to one another, wherein a X-ray or gamma ray interaction with the first scintillating crystal pixel causes the generation of at least one photon, and optical cross talk of the at least one generated photon occurs between the first and the second scintillating crystal pixel, such that the X-ray or gamma ray interaction within the first scintillating crystal pixel is detected in use at the photodetector associated with a light exit face of the second scintillating crystal pixel, and wherein the detector component further comprises a one piece plate of transparent material at an end of the crystal array distal to the light exit face where a photodetector is located, so as to allow optical cross talk between adjacent scintillating crystal pixels, optical cross talk between adjacent scintillating crystal pixels thereby occurring at an end of the crystal array distal to the light exit faces where the photodetectors are located, and characterised in that the scintillating crystal pixels are made slightly absorbing of light in such a way that the amount of light reaching each light exit face of each scintillating crystal pixel depends on a position of the interaction point of the X-ray or gamma ray along the length of the scintillating crystal pixel, the scintillating crystal pixels being made slightly absorbing of light by slightly de-polishing one or more respective long sides, the long sides being provided along the larger dimension. a scintillating crystal having a plurality of scintillating crystal pixels forming a crystal array, wherein each scintillating crystal pixel is larger in one dimension than in the other two dimensions, and wherein each scintillating crystal pixel has more than one light exit faces; and an array of photodetectors, wherein a photodetector is associated with a light exit face of each scintillating crystal pixel, wherein a first and a second scintillating crystal pixel are arranged adjacent to one another, wherein a X-ray or gamma ray interaction with the first scintillating crystal pixel causes the generation of at least one photon, and optical cross talk of the at least one generated photon occurs between the first and the second scintillating crystal pixel, such that the X-ray or gamma ray interaction within the first scintillating crystal pixel is detected in use at the photodetector associated with a light exit face of the second scintillating crystal pixel, and wherein the detector component further comprises a one piece plate of transparent material at an end of the crystal array distal to the light exit face where a photodetector is located, so as to allow optical cross talk between adjacent scintillating crystal pixels, optical cross talk between adjacent scintillating crystal pixels thereby occurring at an end of the crystal array distal to the light exit faces where the photodetectors are located, and