Gamma-ray imaging with a Si/CsI(Tl) Compton detector

We present results from Compton imaging of gamma-ray sources using an instrument constructed from thin silicon scattering detectors and CsI(Tl) absorbing detectors. We have successfully imaged single and double point sources for several common radioactive isotopes (137Cs, 60Co, 22Na, 54Mn). The measured angular resolution is 11.6∘11.6∘ FWHM at 662 keV. In parallel with the hardware effort, a GEANT4-based simulation code was developed. Comparisons between real and simulated data are discussed.