Fig. 3From: SAFIR-I: first NEMA NU 4-2008-based performance characterizationPoint source holder for SAFIR-I. The radius of the white alignment plates corresponds to the inner radius of the detector; the 3D-printed tip (black) accepts \(1-\hbox {cm}^{3}\) cubic sources (\(^{22}\)Na) for detector calibration and NEMA-NU4 measurements. Design by R. Becker for the SAFIR collaborationBack to article page