The book contains lectures of an international NATO-Russian Advanced Research Workshop about the Stand-off-Detection of concealed explosives or explosive charges carried by Suicide-Bombers or in mobile objects (vehicles). The explosives or explosive charges should be detected by harmless methods from a distance and unnoticed by persons under inspection. The ARW was one of a series of workshops before, dealing with the detection of explosives used by terrorists and was initiated by the 'Explosive Detection Working Group' of NATO to create projects of applied research. The aim of the workshop was to present suitable projects, to exchange knowledge and to discuss the feasibility and realization of methods. Projects aim at improvements in sensing techniques that will allow the shortest developing time and are suitable for commercial production. Potential short time availability was a prioritizing isssue.