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The SiPM-based Compton Telescope for Safety and Security (SCoTSS) has beendeveloped with inorganic crystalline scintillator material for gamma detection.The instrument is sensitive enough to be used in a mobile survey mode,accumulating energy deposited in any crystal second-by-second and tagging thesespectra with GPS position. The SCoTSS imager of course has the additionaladvantage of being able to produce an image of the radioactive objects in itsfield of view using events that satisfy a coincidence trigger between thescatter and absorber layers. The Advanced Radiation Detector for UAV Operations(ARDUO) on the other hand, is a non-imaging directional detector intended foruse aboard a small unmanned aerial vehicle (UAV). The ARDUO detector featuresexactly the same volume of CsI(Tl) as is used in the absorber layer of a singleSCoTSS module, giving it similar detection and alarming sensitivity, andmap-making capability. However, in the ARDUO detector, the crystals arearranged closely together to optimize direction determination fromself-shielding effects. Flown in a grid pattern with a UAV over an area ofextended contamination, the ARDUO detector is also capable of making a map orimage of that area. With its close-packed crystal arrangement, the ARDUOdetector makes a poor Compton imager but does have some ability to produce aperipheral image in a fly-by. In this presentation we investigate the relativemerits of Compton imaging versus mobile directional detection.

Which is better, a SCoTSS gamma imager, or an ARDUO UAV-borne directional detector?