Abstract
The possibility of using a pair of detectors acting in coincidence to provide a compton spectrometer and thereby allow directional detection of radiation without shielding is described. The directional property of the concept relies on the detection of photons which are backscattered by one of the detectors. The possible use of the concept to enhance photopeak spectra is also examined. Low count efficiency rules out the generation of well resolved compton spectra in an aircraft but the change of count rate in the compton channel appears to provide for a practical real time monitor for the direction of radiation sources which generate significant anomalies in the normal photopeak spectrum.
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