Prototype design of multiple Compton gamma-ray camera

It has been found that the first Compton scattering of the gamma-ray energy-degrading process can be correctly reconstructed with a high probability if energies and positions of recoil electrons are recorded within a few keV (RMS) and equivalent to 1*1*1 mm/sup 3/ for the first four to five steps. Such a device called the multiple Compton gamma-ray camera, can be used to measure the energy, direction, and polarization of gamma rays in the sub-MeV to a few MeV range. The design of a prototype optimized to 150-600-keV gamma rays is presented. Monte Carlo studies of the design predict a high-detection efficiency, a high polarization analyzing power, and a reasonable angular resolution without collimators.<>