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1. (WO2018005940) PIXELATED GAMMA DETECTOR
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CLAIMS

We claim.:

1. A pixelated gamma detector comprising:

a scintillator column assembly having scintillator crystals and optical transparent elements alternating along a longitudinal axis of the scintillator column:

a collimator assembly having about parallel longitudinal walls, the longitudinal walls separated by about parallel collimator septum, the collimator septum spaced apart to form a plurality of collimator channels;

respective ones of the scintillator crystals having a first height and width about equal in dimension to a corresponding dimension of the collimator channel;

respective ones of the optical transparent element having a second height and width about equal in dimension to a corresponding dimension of the collimator septum;

the scintillator column assembly positioned adjacent to the collimator assembly so that the respective ones of the scintillator crystal are positioned adjacent to respective ones of the collimator channels, and the respective ones of the optical transparent element are positioned adjacent to respective ones of the collimator septum; and

a first photosensor and a second photosensor, the first and the second photosensor each connected to an opposing end of the scintillator column assembly,

2. The pixelated gamma detector of claim 1 , including the respective optical transparent elements formed from at least one of glass, acrylic, optical epoxy, and a gas.

3. The pixelated gamma detector of claim i, including the respective scintillator crystals formed from at least one of sodium iodide: thallium, Iutetiurn oxy-orthosiiicate, lutetium yttrium oxy-orthosilicate, bismuth germanium oxide, cerium bromide, lanthanum bromide, and gadolinium pyrosilicate.

4. The pixelated gamma detector of claim 1, including the scintillator column assembly encased in an optical transparent casing.

5. The pixelated gamma detector of claim 4, the optical transparent casing formed from at least one of clear quartz, glass, optically transparent epoxy, optical liquid, and a gas.

6. The pixelated gamma detector of claim 1, including one or more of the respective transparent elements having a different directional optical reflectivity property.

7. An inspection system for inspection of an object interior, the system comprising:

a radiation source, a radiation shield, and a pixelated gamma detector;

a control processor connected to an electronic communication network, the control processor in communication with the radiation source and the pixelated gamma detector across the electronic communication network;

the radiation source, the radiation shield, and the pixelated gamma detector configured to be inserted into the object interior, and configured to be translated along a longitudinal axis of the object;

the radiation source configured to emit gamma rays or x-rays, the shield located in proximity7 to the radiation source and configured to absorb a portion of direct radiation; and the pixelated gamma detector configured to receive backscatter radiation off the object interior, the pixelated gamma detector including:

a scintillator column assembly having scintillator crystals and optical transparent elem ents alternating along a longitudinal axis of the scintillator column ;

a collimator assembly having about parallel longitudinal walls, the longitudinal walls separated by about parallel collimator septum, the collimator septum spaced apart to form a plurality of collimator channels;

respective ones of the scintillator crystals having a first height and width about equal in dimension to a corresponding dimension of the collimator channel;

respective ones of the optical transparent element having a second height and width about equal in dimension to a corresponding dimension of the collimator septum;

the scintillator column assembly positioned adjacent to the collimator assembly so that the respective ones of the scintillator crystal are positioned adjacent to respective ones of the collimator channels, and the respective ones of the optical transparent element are positioned adjacent to respective ones of the collimator septum;

a first photosensor and a second photosensor, the first and the second photosensor each connected to an opposing end of the scintillator column assembly: and

the scintillator column assembly encased in an optical transparent casing.

8. The system, of claim 7, including:

a first signal output from the first photosensor and a second signal output from the second photosensor;

the first and the second signal outputs connected to a respective signal splitter, each respective signal splitter configured to provide an output signal to a gate circuit and to a readout circuit,

9. The system of claim 8, including the gate circuit configured to provide a gate signal to the readout circuit.

10. The system of claim 8, the readout circuit including an analog-to-digital converter configured to digitize each respective output signal of the splitter.

11 . The system of claim 9, the readout circuit including an analog-to-digital converter configured to digitize each respective output signal of the splitter, the digitization of each respective output signal occurring under control by the gate signal.

12. The system of claim 8, the readout circuit including an output controller configured to compare the respective digitized output signals to determine the relative position x of radiation event.

13. The system of claim 7, including a workstation configured to:

analyze data of relative position x of radiation events provided by the readout circuitry, and backscatter radiation based on the relative position x ; and

display data representative of defects in the object interior.

14. A method for inspection of an object interior, the method comprising:

inserting a radiation source, a radiation shield, and a pixelated gamma detector into the object interior, the radiation source emitting gamma rays or x-rays, the shield located in proximity to the radiation source and absorbing a portion of direct radiation;

translating the radiation source, the radiation shield, and the pixelated gamma detector along a longitudinal axis of the object;

the pixelated gamma detector receiving backscatter radiation off the object interior, the pixelated gamma detector including:

a scintillator column assembly having scintillator crystals and optical transparent elements alternating along a longitudinal axis of the scintillator column;

a coilimator assembly having about parallel longitudinal walls, the longitudinal wails separated by about parallel collimator septum, the collimator septum spaced apart to form a plurality of collimator channels;

respective ones of the scintillator crystals having a first height and width about equal in dimension to a corresponding dimension of the collimator channel;

respective ones of the optical transparent element having a second height and width about equal in dimension to a corresponding dimension of the collimator septum;

the scintillator column assembly positioned adjacent to the collimator assembly so that the respective ones of the scintillator crystal are positioned adjacent to respective ones of the collimator channels, and the respective ones of the optical transparent element are positioned adjacent to respective ones of the coilimator septum;

a first photosensor and a second photosensor, the first and the second photosensor each connected to an opposing end of the scintillator column assembly; and

the scintillator column assembly encased in an optical transparent casing.

15. The method of claim 14, including:

the first photosensor providing a first signal output to a first signal splitter, and the second photosensor providing a second signal output to a second signal splitter;

the first and the second signal splitter each providing a respective output signal to a gate circuit and to a readout circuit.

16. The method of claim 15, including the gate circuit providing a gate signal to the readout circuit.

17. The method of claim 15, including within the readout circuitiy an analog-to-digital converter digitizing a respective output signal of the splitter.

18. The method of claim. 16, including within the readout circuitiy an analog -to-digital converter digitizing each respective output signal of the splitter, the digitization of each respective output signal occurring under control by the gate signal.

19. The method of claim 15, including within the readout circuitsy an output controller comparing the respective digitized output signals to determine the relative position x of radiation events of the backscatter radiation.

20. The method of claim 14, including a workstation analyzing the relative position x of radiation events data provided by the readout circuitiy, and backscatter radiation based on the relative position x determined backscatter radiation; and

displaying data representative of defects in the object interior.