A radiation scanning system comprises a radiation source and a radiation detector that are proximate a crane system that moves objects between the source and the detector for scanning. The source and/or detector may be supported by the crane system or may be near to the crane system. Preferably, the source and detector are supported by the crane system or they are within a profile defined by the crane system. The radiation scanning system is particularly suited to scan cargo conveyances, such as sea cargo conveyances, as they are being removed from or loaded onto a ship. Methods of examining objects are disclosed, as well.