Multi-spectral X-ray target and source

1. A method for operating an X-ray generator, the method comprising:

emitting, by a source of the X-ray generator, electrons towards a first section of a multi-spectral X-ray target of the X-ray generator,

wherein the multi-spectral X-ray target is rotatable about an axis perpendicular to a motion of the electrons and comprises a plurality of sections, which are each radially extending, including the first section, and

wherein each of the sections comprises an X-ray generating material and at least two of the sections comprise a different X-ray generating material; and

generating, by the first section of the multi-spectral X-ray target, a first set of X-rays, when the electrons impinge on the first section of the multi-spectral X-ray target,

wherein the first set of X-rays comprises a first peak characteristic energy.

2. The method of claim 1 , wherein the method further comprises:

rotating, by an anode driver, the multi-spectral X-ray target such that the source is in position to project the electrons towards a second section of the multi-spectral X-ray target;

emitting, by the source, the electrons towards the second section of the multi-spectral X-ray target of the X-ray generator; and

generating, by the second section of the multi-spectral X-ray target, a second set of X-rays, when the electrons impinge on the second section of the multi-spectral X-ray target.

3. The method of claim 2 , wherein the second section of the multi-spectral X-ray target comprises a different X-ray generating material than the first section, and wherein the second set of X-rays comprises a second peak characteristic energy.

4. The method of claim 2 , wherein the method further comprises:

repeating, for all remaining sections of the multi-spectral X-ray target, rotating the multi-spectral X-ray target such that the source is in position to project the electrons towards another section of the multi-spectral X-ray target, emitting the electrons towards the another section of the multi-spectral X-ray target, and generating another set of X-rays.

5. The method of claim 1 , wherein each of the sections of the multi-spectral X-ray target comprises a different X-ray generating material than one another, and

wherein sets of X-rays generated by each of the sections of the multi-spectral X-ray target each comprise a different peak characteristic energy.

6. The method of claim 1 , wherein each of the X-ray generating materials is one of Tungsten (W), Rhenium (Re), Molybdenum (Mo), Niobium (Nb), Tantalum (Ta), or Iridium (Ir).

7. A method for discriminating a specimen, the method comprising:

emitting, by a source of an X-ray generator, electrons towards a first section of a multi-spectral X-ray target of the X-ray generator,

wherein the multi-spectral X-ray target is rotatable about an axis perpendicular to a motion of the electrons and comprises a plurality of sections, which are each radially extending, including the first section, and

wherein each of the sections comprises an X-ray generating material and at least two of the sections comprise a different X-ray generating material;

generating, by the first section of the multi-spectral X-ray target, a first set of X-rays, when the electrons impinge on the first section of the multi-spectral X-ray target,

wherein the first set of X-rays comprises a first peak characteristic energy;

radiating, through an X-ray window of the X-ray generator, the first set of X-rays towards at least a portion of the specimen;

detecting, by at least one X-ray detector, at least one of the first set of X-rays or a first set of backscattered X-rays, which are produced by the first set of X-rays striking the at least a portion of the specimen; and

processing, by at least one processor, at least one of the first set of X-rays or the first set of backscattered X-rays to discriminate the specimen.

8. The method of claim 7 , wherein the method further comprises:

rotating, by an anode driver, the multi-spectral X-ray target such that the source is in position to project the electrons towards a second section of the multi-spectral X-ray target;

emitting, by the source, the electrons towards the second section of the multi-spectral X-ray target of the X-ray generator;

generating, by the second section of the multi-spectral X-ray target, a second set of X-rays, when the electrons impinge on the second section of the multi-spectral X-ray target;

radiating, through an X-ray window of the X-ray generator, the second set of X-rays towards the at least a portion of the specimen;

detecting, by the at least one X-ray detector, at least one of the second set of X-rays or a second set of backscattered X-rays, which are produced by the second set of X-rays striking the at least a portion of the specimen; and

processing, by the at least one processor, at least one of the second set of X-rays or the second set of backscattered X-rays to further discriminate the specimen.

9. The method of claim 8 , wherein the second section of the multi-spectral X-ray target comprises a different X-ray generating material than the first section, and

wherein the second set of X-rays comprises a second peak characteristic energy.

10. The method of claim 8 , wherein the method further comprises repeating, for all remaining sections of the multi-spectral X-ray target, rotating the multi-spectral X-ray target such that the source is in position to project the electrons towards another section of the multi-spectral X-ray target, emitting the electrons towards the another section of the multi-spectral X-ray target, generating another set of X-rays, radiating the another set of X-rays towards the at least a portion of the specimen, detecting at least one of the another set of X-rays or another set of backscattered X-rays, and processing at least one of the another set of X-rays or the another set of backscattered X-rays to further discriminate the specimen.

11. The method of claim 8 , wherein the processing comprises:

digitizing, by a detector multiplexer and driver processor, at least one of at least one of the sets of X-rays or at least one of the sets of backscattered X-rays to generate an image for each of the sections of the multi-spectral X-ray target; and

generating, by an image processor, a conglomeration image of the specimen by merging all of the images for each of the sections together.

12. An X-ray generator system, the system comprising:

a multi-spectral X-ray target rotatable about an axis perpendicular to a motion of incoming electrons and comprising a plurality of sections, which are each radially extending,

wherein each of the sections comprises an X-ray generating material and at least two of the sections comprise a different X-ray generating material;

a source to emit the electrons towards a first section of the multi-spectral X-ray target; and

the first section to generate a first set of X-rays, when the electrons impinge on the first section of the multi-spectral X-ray target,

wherein the first set of X-rays comprises a first peak characteristic energy; and

an anode driver to rotate the multi-spectral X-ray target such that the source is in position to project the electrons towards another section of the multi-spectral X-ray target.

13. The system of claim 12 , wherein the system her comprises an X-ray window to allow for the first set of X-rays to radiate through.

14. The system of claim 12 , wherein the system further comprises at least one X-ray detector to detect at least one of the first set of X-rays or a first set of backscattered X-rays, which are produced by the first set of X-rays striking at least a portion of a specimen.

15. The system of claim 14 , wherein the X-ray detector is one of a one-dimensional (1D) detector or a two-dimensional (2D) detector.

16. The system of claim 14 , wherein the system further comprises at least one processor to process at least one of the first set of X-rays or the first set of backscattered X-rays to discriminate the specimen.

17. The system of claim 12 , wherein each of the sections of the multi-spectral X-ray target comprises a different X-ray generating material than one another, and wherein sets of X-rays generated by each of the sections of the multi-spectral X-ray target each comprise a different peak characteristic energy.

18. The system of claim 12 , wherein the multi-spectral X-ray target is a multi-facet target, and wherein an external surface of each of the sections comprises a facet.

19. The system of claim 12 , wherein the multi-spectral X-ray target is a multi-sector target, and wherein an external surface of each of the sections comprises an arc.

20. A method for discriminating a specimen, the method comprising:

for each location to be scanned on the specimen, capturing data for at least one full rotation of a multi-spectral X-ray target of an X-ray generator,

wherein the multi-spectral X-ray target is rotatable about an axis perpendicular to a motion of incoming electrons and comprises a plurality of sections, which are each radially extending, and at least two of the sections comprise a different X-ray generating material,

wherein the data is in a form of a line of pixels for each of the sections for each of the tell rotations; and

at least one of merging all of the data for a particular section together to form a single spectral image of the specimen, or merging all of the data for each of the full rotations to form a multi-spectral line of pixels for each of the full rotations and merging all of the multi-spectral lines of pixels together to form a multi-spectral image of the specimen.