Development of a Mixed-Radiation Directional Rotating Scatter Mask Detection System
Technical Report,01 Sep 2017,21 Mar 2019
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB United States
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Previous work demonstrated gamma-ray directional detection through the integration of a radiation detection system and an additively manufactured rotating scatter mask RSM. This work advances the RSM directional detection system through improvements in the systems design, validation of a new scatter mask, and the novel ability to directionally detect both neutrons and gamma rays. The mixed-radiation RSM system developed for this research utilized the Spartan I mask design coupled with a 1 EJ-309 liquid scintillator. A GEometry ANd Tracking Geant4 model is developed and quantitatively compared to experimental measurements for both pulse-height energy spectra and detector response curves, validating the systems directional detection capabilities. Two sets of directional measurements are performed with an americium-beryllium source, varying the sources distance and direction for each set. The RSM correctly identified the direction of the source within 5 in both the azimuthal and polar directions for neutron induced events and within 10 for gamma rays. The results demonstrated the RSM is a compact, lightweight, and modular directional detection system useful for safeguard and counterproliferation missions.
- Nuclear Physics and Elementary Particle Physics
- Radioactivity, Radioactive Wastes and Fission Products