Source detection at 100 meter standoff with a time-encoded imaging system

摘要

We present the design, characterization, and testing of a laboratoryprototype radiological search and localization system. The system, based ontime-encoded imaging, uses the attenuation signature of neutrons in time,induced by the geometrical layout and motion of the system. We havedemonstrated the ability to detect a ~1 mCi Cf-252 radiological source at 100 mstandoff with 90% detection efficiency and 10% false positives againstbackground in 12 min. This same detection efficiency is met at 15 s for a 40 mstandoff, and 1.2 s for a 20 m standoff.