Systems and methods for identifying a substance

1. A method for identifying a substance, said method comprising:

detecting, by a first scatter detector, a first set of scattered radiation;

generating a first effective atomic number from the first set of scattered radiation;

detecting, by a second scatter detector, a second set of scattered radiation;

generating a second effective atomic number from the second set of scattered radiation; and

determining whether the first effective atomic number is within a limit of the second effective atomic number.

2. A method in accordance with claim 1 further comprising:

storing the first and second effective atomic numbers upon determining that the first effective atomic number is within the limit of the second effective atomic number; and

generating a packing fraction from the second set of scattered radiation upon determining that the first effective atomic number is not within the limit of the second effective atomic number.

3. A method in accordance with claim 1 further comprising:

generating a first diffraction profile from the first set of scattered radiation;

generating a first packing fraction from the first effective atomic number; and

determining whether at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is within a threshold of at least one of a plurality of parameters of a set stored in a memory device.

4. A method in accordance with claim 1 , wherein the first effective atomic number is not generated from the second set of scattered radiation.

5. A method in accordance with claim 1 , wherein the second effective atomic number is not generated from the first set of scattered radiation.

6. A method in accordance with claim 1 further comprising:

generating a first diffraction profile from the first set of scattered radiation;

generating a first packing fraction from the first effective atomic number;

determining whether at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is within a threshold of at least one of a plurality of parameters of a set stored in a memory device; and

determining the substance as identified upon determining that at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is within the threshold.

7. A method in accordance with claim 1 further comprising:

generating a first diffraction profile from the first set of scattered radiation;

generating a first packing fraction from the first effective atomic number;

determining whether at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is within a threshold of at least one of a plurality of parameters of a set stored in a memory device, wherein said determining whether the first effective atomic number is within a limit of the second effective atomic number comprises determining whether the first effective atomic number is within the limit of the second effective atomic number upon determining that at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is not within the threshold.

8. A method in accordance with claim 1 further comprising generating a packing fraction from the second effective atomic number upon determining that the first effective atomic number is not within the limit of the second effective atomic number.

9. A method in accordance with claim 1 further comprising:

generating a packing fraction from the second effective atomic number upon determining that the first effective atomic number is not within the limit of the second effective atomic number; and

determining whether at least one of the second effective atomic number, the packing fraction, and a second diffraction profile is within a scope of at least one of a plurality of listed parameters within a set, wherein the second diffraction profile is generated from the second set of scattered radiation.

10. A method in accordance with claim 1 further comprising:

generating a packing fraction from the second effective atomic number upon determining that the first effective atomic number is not within the limit of the second effective atomic number;

determining whether at least one of the second effective atomic number, the packing fraction, and a second diffraction profile is within a scope of at least one of a plurality of listed parameters within a set; and

determining the substance as identified upon determining that at least one of the second effective atomic number, the packing fraction, and the second diffraction profile are within the scope of the at least one of the plurality of listed parameters.

11. A method in accordance with claim 1 further comprising:

generating a packing fraction from the second effective atomic number upon determining that the first effective atomic number is not within the limit of the second effective atomic number;

determining whether at least one of the second effective atomic number, the packing fraction, and a second diffraction profile is within a scope of at least one of a plurality of listed parameters within a set; and

storing the second diffraction profile, the second effective atomic number, the packing fraction, and the first effective atomic number upon determining that at least one of the second effective atomic number, the packing fraction, and the second diffraction profile is not within the scope.

12. A system for identifying a substance, said system comprising:

a first scatter detector configured to detect a first set of scattered radiation;

a second scatter detector configured to detect a second set of scattered radiation; and

a processor configured to generate a first effective atomic number from the first set of scattered radiation, to generate a second effective atomic number from the second set of scattered radiation, and to determine whether the first effective atomic number is within a limit of the second effective atomic number.

13. A system in accordance with claim 12 , wherein said processor further configured to:

store the first and second effective atomic numbers upon determining that the first effective atomic number is within the limit of the second effective atomic number; and

generate a packing fraction from the second set of scattered radiation upon determining that the first effective atomic number is not within the limit of the second effective atomic number.

14. A system in accordance with claim 12 , wherein said processor further configured to:

generate a first diffraction profile from the first set of scattered radiation;

generate a first packing fraction from the first effective atomic number; and

determine whether at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is within a threshold of at least one of a plurality of parameters of a set stored in a memory device.

15. A system in accordance with claim 12 , wherein the first effective atomic number is not generated from the second set of scattered radiation.

16. A system in accordance with claim 12 , wherein the second effective atomic number is not generated from the first set of scattered radiation.

17. A system for identifying a substance, said system comprising:

a plurality of x-ray sources configured to generate x-rays;

a first scatter detector configured to detect a first set of scattered radiation generated from the x-rays;

a second scatter detector configured to detect a second set of scattered radiation;

a processor configured to generate a first effective atomic number from the first set of scattered radiation, to generate a second effective atomic number from the second set of scattered radiation, and to determine whether the first effective atomic number is within a limit of the second effective atomic number; and

a plurality of switches configured to couple said processor to the first set of scattered radiation when decoupling said processor from the second set of scattered radiation.

18. A system in accordance with claim 17 , wherein said processor further configured to:

store the first and second effective atomic numbers upon determining that the first effective atomic number is within the limit of the second effective atomic number; and

generate a packing fraction from the second set of scattered radiation upon determining that the first effective atomic number is not within the limit of the second effective atomic number.

19. A system in accordance with claim 17 , wherein said processor further configured to:

generate a first diffraction profile from the first set of scattered radiation;

generate a first packing fraction from the first effective atomic number; and

determine whether at least one of the first packing fraction, the first effective atomic number, and the first diffraction profile is within a threshold of at least one of a plurality of parameters of a set stored in a memory device.