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With the recently developed ISPA (Imaging Silicon Pixel Array)-tube attached either to a planar YAlO 3 (Ce) (YAP) disc (1mm thick) or to a matrix of optically-separated YAP-crystals (5mm high, 0.6 x 0.6 mm 2 cross-section) we achieved high spatial resolution of 57 Co-122 keV photons. The vacuum-sealed ISPA-tube is only 4 cm long with 3.5 cm diameter and consists of a photocathode viewed at 3 cm distance by a silicon pixel chip, directly detecting the photoelectrons. The chip-anode consists ofdoi:10.1109/23.489418 fatcat:j56mugfitfg3nimuwgswmtopom