Author:
Hellfeld Daniel,Bandstra Mark S.,Vavrek Jayson R.,Gunter Donald L.,Curtis Joseph C.,Salathe Marco,Pavlovsky Ryan,Negut Victor,Barton Paul J.,Cates Joshua W.,Quiter Brian J.,Cooper Reynold J.,Vetter Kai,Joshi Tenzing H. Y.
Abstract
AbstractThe ability to map and estimate the activity of radiological source distributions in unknown three-dimensional environments has applications in the prevention and response to radiological accidents or threats as well as the enforcement and verification of international nuclear non-proliferation agreements. Such a capability requires well-characterized detector response functions, accurate time-dependent detector position and orientation data, a digitized representation of the surrounding 3D environment, and appropriate image reconstruction and uncertainty quantification methods. We have previously demonstrated 3D mapping of gamma-ray emitters with free-moving detector systems on a relative intensity scale using a technique called Scene Data Fusion (SDF). Here we characterize the detector response of a multi-element gamma-ray imaging system using experimentally benchmarked Monte Carlo simulations and perform 3D mapping on an absolute intensity scale. We present experimental reconstruction results from hand-carried and airborne measurements with point-like and distributed sources in known configurations, demonstrating quantitative SDF in complex 3D environments.
Publisher
Springer Science and Business Media LLC
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