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The invention provides a test device for assessing the detection capability of an X-ray system with a medium and/or large tunnel size. The device comprises a support and at least one test module mounted on the support. The device may optionally also comprise a stand which holds the support at a pred

The invention provides a test device for assessing the detection capability of an X-ray system with a medium and/or large tunnel size. The device comprises a support and at least one test module mounted on the support. The device may optionally also comprise a stand which holds the support at a predetermined angle to the horizontal. The test module, or at least one of the test modules, is capable of being used in a test for an aspect of the detection capability.

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1. A test device for assessing an X-ray system with a medium or a large tunnel size for its detection capability, the medium tunnel size ranging from 1 m to 1.3 m×1 m to 1.3 m and the large tunnel size being greater than 1.3 m×1.3 m, the device comprising: a support capable of holding at least one t

1. A test device for assessing an X-ray system with a medium or a large tunnel size for its detection capability, the medium tunnel size ranging from 1 m to 1.3 m×1 m to 1.3 m and the large tunnel size being greater than 1.3 m×1.3 m, the device comprising: a support capable of holding at least one test module;at least one test module mounted on the support, wherein the at least one test module is removable from the support;a stand coupled to the support;a rotatable holder coupled to the stand, wherein the rotatable holder holds the support at a predetermined angle to the horizontal and enables the predetermined angle to be varied, wherein the stand comprises a base having a through-hole arranged beneath the at least one test module, the through-hole configured to be larger than a footprint of the at least one test module when arranged at the predetermined angle;a latching mechanism configured to lock the rotatable holder and the support in place relative to the stand and at the predetermined angle, wherein the at least one test module is maintained at the predetermined angle;and an insertion region for inserting forklift forks;wherein at least one of the test modules is capable of being used in a test for an aspect of the detection capability. 2. The test device of claim 1 wherein the at least one test module comprises a wedge construction. 3. The test device of claim 1 wherein the test is selected from the group consisting of wire resolution in air, wire resolution between steel, contrast sensitivity and materials discrimination. 4. The test device of claim 3, comprising at least two test modules, each being capable of being used in a different test. 5. The test device of claim 4, comprising a test module capable of being used in a test of wire resolution in air, a test module capable of being used in a test of wire resolution between steel, a test module capable of being used in a test of contrast sensitivity and a test module capable of being used in a test of materials discrimination. 6. The test device of claim 5 wherein the device is capable of being used in all of tests 1 to 9 as defined in ASTM F792-01. 7. The test device of claim 6, the device having a size capable of passing through an examination tunnel having dimensions 1300 mm×1300 mm. 8. The test device of claim 7, wherein the test device has a size that is incapable of being used in an examination tunnel having dimensions less than about 1 meter×1 meter. 9. The test device of claim 5, the device having a size capable of being mounted on a 1200 mm×1200 mm pallet. 10. The test device of claim 5 wherein the test or tests can be conducted using a single pass of the test device through an examination tunnel of the X-ray system where the X-ray system is a single view X-ray system, or using two passes through an examination tunnel of the X-ray system where the X-ray system is a dual view system. 11. The test device of claim 5, wherein the tunnel has a size sufficient to scan a shipping container having a length of 6 m, a height of 2.4 m and a width of 2.4 m, said device further comprising a radioactive source for testing a capability of a radiation portal for detection of a radioactive substance. 12. The test device of claim 11, wherein the radioactive source comprises potassium-40 or at least one of the radioisotopes listed in ANSI N42.35-2006. 13. The test device of claim 5 wherein the tunnel has a size sufficient to scan a shipping container having a length of 6 m, a height of 2.4 m and a width of 2.4 m, and wherein the test device comprises at least two independently movable test modules. 14. The test device of claim 13, wherein the test modules are each independently selected from the group consisting of a materials discrimination module, a resolution module and a penetration module. 15. The test device of claim 14, wherein the penetration module comprises a plurality of independently rotatable elements. 16. The test device of claim 15, wherein each of the rotatable elements is independently lockable into a desired orientation. 17. A method for assessing an X-ray system with a large tunnel size for its detection capability, the method comprising: passing a test device according to claim 1 through an examination tunnel of said X-ray system so as to expose the test module(s) to X-rays from the system;detecting any X-rays that pass through the test module(s), using the X-ray system to generate an image;determining one or more test results from the image; andassessing the detection capability of the X-ray system from the test result(s). 18. The method of claim 17 further comprising varying the angle of the support to the predetermined angle using the rotatable holder before passing the test device through a tunnel of the X-ray system. 19. The method of claim 18, the method further comprising locking the support by means of the latching mechanism so as to maintain the at least one test module at the predetermined angle. 20. The method of claim 17, wherein when the X-ray system is a single view X-ray system the test device is passed through the tunnel exactly once, and when the X-ray system is a dual view system the test device is passed through the tunnel exactly twice. 21. The method of claim 17, wherein the test device comprises at least two test modules, each being capable of being used in a different test and the assessing step comprises aggregating the test results into a single aggregate score and assessing the operation of the X-ray system using the aggregate score. 22. The method of claim 21, wherein the aggregating comprises adding the test results to obtain the single aggregate score. 23. A method of scanning an object using an X-ray system having a medium or large tunnel, the method comprising: assessing the detection capability of an X-ray system according to the method of claim 17;if necessary, adjusting the X-ray system so as to improve its detection capability; andpassing the object through the tunnel and scanning the object as it passes through the tunnel. 24. The method of claim 23, further comprising forming an image of the scanned object and determining from the image the presence or absence of a certain class of object in the scanned object. 25. A method for assessing a radiation portal with a large tunnel size for its detection capability, the method comprising: passing a test device according to claim 1 through a radiation portal, said test device comprising a radioactive source;determining whether a radiation detector of said portal can detect the radioactive source; andusing the determination to assess the detection capability. 26. The method of claim 25, wherein the test device further comprises a modified shipping container which has external dimensions about 6 m in length and about 2.4 m in both height and width, the support and at least one test module being disposed within the modified shipping container, wherein the modified shipping container has at least a portion of its walls made of a plastic that is substantially transparent to X-rays, whereby, X-rays passing from an X-ray source through at least one of the test modules passes through the plastic in order to reach an X-ray detector. 27. A system for scanning an object comprising: an X-ray system having a medium or large tunnel, and having the capacity to form an image of an object scanned thereby; anda test device according to claim 1. 28. The system of claim 27, further comprising a computer having software loaded thereon, the software being capable of enhancing a raw image obtained by the X-ray system of said scanned object so as to form the image. 29. The test device of claim 5, wherein one of the test modules is a test of wire resolution in air. 30. The test device of claim 5, further comprising a steel mounting plate on which at least one of the test modules is disposed. 31. The test device of claim 30, wherein the mounting plate is about 10 mm thick. 32. The test device of claim 30, wherein the mounting plate is balanced so as to be rotatable by hand when the support is not locked. 33. The test device of claim 30, wherein one of the test modules comprises a steel step wedge disposed on the mounting plate for testing contrast sensitivity. 34. The test device of claim 33, wherein the step wedge is disposed diagonally on the mounting plate. 35. A test device for assessing an X-ray system with a large tunnel, the device comprising: a support capable of holding at least one test module;at least one test module mounted on the support, wherein the at least one test module is removable from the support;a stand coupled to the support;a rotatable holder coupled to the stand, wherein the rotatable holder holds the support at a predetermined angle to the horizontal and enables the predetermined angle to be varied, wherein the stand comprises a base having a through-hole arranged beneath the at least one test module, the through-hole configured to be larger than a footprint of the at least one test module when arranged at the predetermined angle;a latching mechanism configured to lock the rotatable holder and the support in place relative to the stand and at the predetermined angle, wherein the at least one test module is maintained at the predetermined angle; andan insertion region for inserting forklift forks;wherein at least one of the test modules is capable of being used in a test for an aspect of the detection capability; andwherein the tunnel has a size sufficient to scan a shipping container having a length of 6 m, a height of 2.4 m and a width of 2.4 m, the device comprising a modified shipping container having external dimensions of about 6 m in length and about 2.4 m in both height and width, the support and at least one test module being disposed within the modified shipping container. 36. The test device of claim 35, wherein the modified shipping container comprises double doors at either end for inserting or removing the at least one test module into or from said container. 37. The test device of claim 35, wherein the modified shipping container has at least a portion of its walls made of a plastic that is substantially transparent to X-rays, whereby, X-rays passing from an X-ray source through at least one of the test modules passes through the plastic in order to reach an X-ray detector. 38. The test device of claim 35, wherein the at least one test module comprises a wedge construction.