1. A method for detecting, identifying and/or characterizing nuclear and/or radiological material in a container, vehicle, or on a person, which is part of a flow of traffic, goods, or pedestrians, and which is monitored, at places such as ports, border crossings, airports, nuclear facility perimeters, public events, public transport facilities, roads, bridges or tunnels, the method comprising the steps of: a. providing at least one detector, which is capable of detecting radiation events being interrelated to nuclear or radiological material; b. bringing said at least one detector in the vicinity of the container, vehicle or pedestrian to be monitored; c. detecting radiation events being interrelated to said container vehicle or pedestrian to be monitored; d. assigning each detected radiation event an individual time stamp in order to generate a time pattern of the detected radiation events; and e. analyzing said time pattern with respect to time correlation structures in order to identify a presence and/or a characteristic of the nuclear or radiological material.