PROJECT TITLE :

Combining Radiography and Passive Measurements for Radiological Threat Localization in Cargo

ABSTRACT:

Detecting shielded special nuclear material (SNM) in a cargo container could be a tough drawback, since shielding reduces the quantity of radiation escaping the container. Radiography provides info that's complementary to that provided by passive gamma-ray detection systems: while in some way sensitive to radiological materials, radiography can reveal highly shielded regions that may mask a passive radiological signal. Combining these measurements has the potential to improve SNM detection, either through improved sensitivity or by providing a resolution to the inverse drawback to estimate source properties (strength and site). We have a tendency to present a knowledge-fusion technique that uses a radiograph to provide an estimate of the radiation-transport atmosphere for gamma rays from potential sources. This approach makes quantitative use of radiographic images while not relying on image interpretation, and leads to a probabilistic description of probably source locations and strengths. We tend to present results for this methodology for a modeled take a look at case of a cargo container passing through a plastic-scintillator-based mostly radiation portal monitor and a transmission-radiography system. We tend to notice that a radiograph-based inversion scheme allows for localization of a low-noise supply placed randomly at intervals the check container to inside 40 cm, compared to seventy cm for triangulation alone, whereas strength estimation accuracy is improved by a factor of six. Enhancements are seen in regions of both high and low shielding, but are most pronounced in highly shielded regions. The approach proposed here combines transmission and emission data in a manner that has not been explored within the cargo-screening literature, advancing the flexibility to accurately describe a hidden supply primarily based on currently-offered instrumentation.


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