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This paper details preliminary photon measurements with the monolithicsilicon detector ATLASPix, a pixel detector built and optimized for the CERNexperiment ATLAS. The goal of this paper is to determine the promise ofpixelated silicon in future space-based gamma-ray experiments. With this goalin mind, radioactive photon sources were used to determine the energyresolution and detector response of ATLASPix; these are novel measurements forATLASPix, a detector built for a ground-based particle accelerator. As part ofthis project a new iteration of monolithic Si pixels, named AstroPix, have beencreated based on ATLASPix, and the eventual goal is to further optimizeAstroPix for gamma-ray detection by constructing a prototype Comptontelescope.The energy resolution of both the digital and analog output ofATLASPix is the focus of this paper, as it is a critical metric for Comptontelescopes. It was found that with the analog output of the detector, theenergyresolution of a single pixel was 7.69 +/- 0.13% at 5.89 keV and 7.27 +/-1.18% at 30.1 keV, which exceeds the conservative baseline requirements of 10%resolution at 60 keV and is an encouraging start to an optimistic goal of<2%resolution at 60 keV. The digital output of the entire detector consistentlyyielded energy resolutions that exceeded 100% for different sources. The analogoutput of the monolithic silicon pixels indicates that thisis a promisingtechnology for future gamma-ray missions, while the analysis of the digitaloutput points to the need for a redesign of future photon-sensitive monolithicsilicon pixel detectors.

AstroPix: Investigating the Potential of Silicon Pixel Sensors in the Future of Gamma-ray Astrophysics