Liquid xenon gamma ray imager

A method for detecting gamma rays, the method comprising:

• creating an electric field throughout a chamber containing a scintillation liquid, a first optical module immersed in the scintillation liquid, and a second optical module immersed in the scintillation liquid, wherein the first and second optical modules are optically isolated from each other;
• purifying the scintillation liquid to remove contaminants from the scintillation liquid;
• interacting a gamma ray with the scintillation liquid;
• wherein the interacting comprises a first interaction of the gamma ray with the scintillation liquid in the first optical module and a second interaction of the gamma ray with the scintillation liquid in the second optical module;
• detecting with a first photodetector or set of photodetectors scintillation light resulting from the first interaction in the first optical module;
• detecting with a second photodetector or set of photodetectors scintillation light resulting from the second interaction in the second optical module;
• detecting with charge readout devices ionization charges produced by the first and second interactions within the first and second optical modules;
• processing signals from the first and second sets of photodetectors and from the charge readout devices to calculate a gamma ray energy value and a gamma ray angle value, wherein the processing uses Compton scattering formula inversion, and wherein the processing uses, for the first interaction and for the second interaction, anti-correlation of charge signals and prompt scintillation light signals.