Abstract
The Rotational Modulation Collimator (RMC) is a simple and versatile tool for the radiation imaging system with low cost, makes it a reasonable selection for locating and tracking nuclear materials and radiation sources. In this paper, Monte Carlo simulation-based design studies for an alternative RMC which has an extended field-of-view will be presented. Modulation patterns for 5 different hemispherical RMC (H-RMC) designs were simulated for various source locations, and fundamental characteristics of rotational modulation patterns were investigated. Obtained patterns showed variations depending on the source location for most of the H-RMC designs, exhibiting promises for the future development of an omni-directional radiation imager based on a non-position sensitive radiation detector.
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