Abstract: An inspection system (100) having: ?a source (101) configured to generate inspection radiation (40); ?a collimator (103) configured to collimate the inspection radiation into an inspection beam (41) configured to irradiate a section of a vehicle (20); ?a filter (102) located between the source and the collimator, the filter having at least a cargo configuration and an attenuation configuration; and ?a controller (104) configured to control the configuration of the filter, such that the filter is in the cargo configuration when the inspection beam irradiates a container (23), and in the attenuation configuration when the inspection beam irradiates a cabin (21).