Detection of Ionizing Radiation using Solar Blind Air Fluorescence

This report looks at the feasibility of detecting radiation sources by using the photons produced by the ionization of the air surrounding the source. Some of these fluorescence photons are emitted in the UV solar blind spectral region which offers the possibility of detection in full daylight. A review of the basic technique is given as well as detailed radiation source simulations using the Geant4 simulation package and some preliminary experimental studies. Some conclusions on the practicality of this technique for radiation detection, as well as unresolved issues, are discussed. APPROVED FOR PUBLIC RELEASE