Fig. 3.
Left: Energy spectrum from a 2×2×20 mm3 crystal with 30 µm finish, which is fitted with a Gaussian to the photopeak. The collimated beam for this dataset is aligned at the center of the 20 mm long crystal. Right: R space histograms for the same crystal. The source positions were 1 mm apart. The DOI response function is the centroid location of the R histogram as a function of source position, while the error is given as the FWHM of the R histogram for the same dataset.