Abstract
The nitrogen camera is an instrument based on a nuclear technique which is capable of imaging nitrogen concentrations with surface densities and amounts typical of currently concealed conventional explosives. Its signal is the totality of high-energy gamma rays detected in the multiscalar mode after the irradiation of a target pixel by a beam from a 50 MeV electron racetrack microtron. The sole interfering signal, from 13C, can be disentangled by two methods. Images of 180 2 × 2 cm 2 pixels, which are shown, eventually will be produced in ∼ 7.2 s. Progress towards an operational nitrogen camera is discussed.
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