This paper presents initial results from a portable Temporal Imaging Compton camera utilizing CeBr₃ and LYSO:Ce monolithic scintillator plates for high-energy gamma-ray imaging. Designed for nuclear decommissioning and waste management, the camera leverages advanced timing and spatial reconstruction algorithms to enhance resolution and reduce background noise. With a 5 mm CeBr₃ scatterer and 20 mm LYSO absorber, the system achieves a spatial resolution of 2.1 mm (FWHM) and a Coincidence Resolving Time (CRT) of 293 ps. Using list-mode maximum likelihood iterative reconstruction, the system successfully localized 1.3 MeV gamma sources with an angular resolution of ~10° (FWHM). These findings validate the camera's potential for precise and efficient radioactive source imaging in industrial and environmental applications.