Radiation detector for combined detection of low-energy radiation quanta and high-energy radiation quanta

A radiation detector for combined concurrent detection of low-energy radiation quanta and high-energy radiation quanta, the radiation detector having a multi-layered structure, comprising:

• a rear scintillator layer configured to emit a burst of scintillation photons responsive to a high-energy radiation quantum being absorbed by the rear scintillator layer;
• a rear photosensor layer attached to a back side of the rear scintillator layer, said rear photosensor layer including a two-dimensional array of pixels having a rear photosensor layer pixel pitch in each of the two dimensions configured to detect scintillation photons generated in the rear scintillator layer;
• a front scintillator layer arranged in front of the rear scintillator layer opposite the rear photosensor layer, said front scintillator layer configured to emit a burst of scintillation photons responsive to a low-energy radiation quantum being absorbed by the front scintillator layer;
• and
• a front photosensor layer attached to a front side of the front scintillator layer opposite the rear scintillator layer, said front photosensor layer including a two-dimensional array of pixels having a front photosensor layer pixel pitch in each of the two dimensions configured to detect scintillation photons generated in the front scintillator layer;
• wherein the high-energy radiation quanta pass through the front scintillation layer and the front photosensor layer before being absorbed by the rear scintillation layer;
• wherein the high-energy radiation quanta are gamma rays and the low-energy radiation quanta are X-rays;
• and
• wherein the rear photosensor layer pixel pitch is unequal to the front photosensor layer pixel pitch.