Comptel 中国斜学我术大学 University of Science and Technology of China COMPTEL GAMMA RAY Gamma Ray scattered; light emitted. Light recorded. Compton scattering telescope 0.75-30MeV Two scintillator layer and coincidence detection Gamma Ray absorbed, light pulse emitted and recorded.Comptel Compton scattering telescope 0.75 - 30 MeV Two scintillator layer and coincidence detection