Optimization and Parameter Characterization for Rotating Scatter Mask Designs
Abstract
The Rotating Scatter Mask system, which consists of a NaI detector, plexiglass mask, and a small motor, is a low cost directional radiation detection system with a nearly 4pi field-of-view over a broad range of photon energies. However, the current mask design is limited by similarities in the directional modes of the detector response, causing potential misidentification errors when locating a source. A new class of RSM designs were simulated using MCNP and compared to the current mask design using the modal assurance criterion to characterize differentiability between directional modes. These masks were shown to successfully decouple the angular components of the source's direction, improving the average criterion value by up to 83 and limiting the directional uncertainty to the order of the physical system's angular resolution. Correlation between the geometry of the mask and the detector response for this new class of designs also presents an improved method for determining source direction, potentially enabling imaging capabilities. Finally, the new designs drastically improved the system's efficiency, reducing the time to identify the source by up to two orders of magnitude.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 22, 2018
- Accession Number
- AD1056260
Entities
People
- Robert J. Olesen
Organizations
- Air Force Institute of Technology