Patent Number: 
Section: claims

1. A method of scanning a number of objects in a multi-level environment, comprising:selecting a storage area having a plurality of movable racks, each rack occupying at least one level and capable of carrying at least one object;selecting a scanner;establishing a first vacant multi-level aisle among the racks;moving the scanner substantially vertically within the first vacant aisle to scan successive objects substantially adjacent to the first vacant aisle to detect at least one pre-determined characteristic;establishing at least a second vacant multi-level aisle among the racks; andmoving the scanner substantially vertically within at least the second vacant aisle to scan additional objects substantially adjacent to the second vacant aisle. 2. The method of claim 1 wherein each rack includes a chassis movable along at least one track. 3. The method of claim 1 wherein each rack is movable in at least one side direction. 4. The method of claim 1 wherein each rack is configured to hold at least one intermodal container. 5. The method of claim 4 wherein the scanner is suspended from a crane capable of lifting at least one intermodal container. 6. The method of claim 1 further including generating an alert when the scanner detects the at least one pre-determined characteristic. 7. A method of scanning a number of intermodal containers, comprising:selecting a vessel having at least one cargo hold having a plurality of movable racks, each rack occupying at least one level and capable of carrying at least one container;selecting a scanner;establishing a first vacant multi-level aisle among the racks;moving the scanner substantially vertically within the first vacant aisle to scan successive containers substantially adjacent to the first vacant aisle to detect at least one pre-determined characteristic;establishing at least a second vacant multi-level aisle among the racks; andmoving the scanner substantially vertically within at least the second vacant aisle to scan additional containers substantially adjacent to the second vacant aisle. 8. The method of claim 7 wherein each rack includes a chassis movable along at least one track secured within the cargo hold. 9. The method of claim 7 wherein each rack is movable in at least one side direction. 10. The method of claim 7 wherein the scanner is suspended from a crane capable of lifting at least one intermodal container. 11. The method of claim 7 further including generating an alert when the scanner detects the at least one pre-determined characteristic in a container. 12. The method of claim 11 further including placing containers having the detected pre-determined characteristic in at least one of quarantine and disposal. 13. The method of claim 7 wherein at least two sides of substantially each container are scanned. 14. The method of claim 7 wherein the containers are scanned while the vessel is underway. 15. A system of scanning a number of intermodal containers, comprising:a storage area having a plurality of movable racks, each rack occupying at least one level and capable of carrying at least one container, the racks capable of being moved to establish successive vacant multi-level aisles among the racks; andat least one scanner movable substantially vertically within the successive vacant aisles to scan successive containers substantially adjacent to each vacant aisle to detect at least one pre-determined characteristic. 16. The system of claim 15 wherein each rack includes a chassis movable along at least one track. 17. The system of claim 15 wherein each rack is movable in at least one side direction. 18. The system of claim 15 wherein the scanner is suspended from a crane capable of lifting at least one intermodal container. 19. The system of claim 15 wherein the system generates an alert when the scanner detects the at least one pre-determined characteristic.