Systems for the detection and identification of nuclear explosions in the atmosphere and in space

A qualitative perspective is given of problems encountered in designing systems for the detection and identification of nuclear explosions above the earth´s surface. Pertinent physical phenomenology is summarized; detection techniques are explained briefly; effects of natural backgrounds are mentioned; system requirements are discussed; a summary comparative table is presented which incorporates these various considerations. The paper is meant to serve as an introduction to a group of technical papers on diverse related subjects.