  We investigate the utility of coded aperture (CA) for roadside radiation
threat detection applications. With coded aperture, information in the form of
photon quantity is traded for directional information. Whether and in what
scenarios this trade-off is beneficial is the focus of this study. We quantify
the impact of a masking approach by comparing performance with an unmasked
approach in terms of both detection and localization of a roadside nuclear
threat. We measure performance over many instances of a drive-by scenario via
Monte Carlo simulation based on empirical observations.
