Abstract
Unknown shielding of radioactive material can be estimated via the combined photoelectric modulation and forward-angle Compton scatter of emitted source gamma-rays in recorded spectra. Time Encoded Imaging (TEI), using 3D pixelated, CdZnTe detectors, can be used to estimate low energy, high angular resolution, directional gamma-ray spectra. Using directional spectra from TEI, directional detection and characterization of unknown shielding mass thickness and atomic number is possible. Estimated directional shielding parameters and solid angle corrections can then be used to improve estimates of source intensities. In a proof of concept GEANT4 simulation, several $^{235}U$ sources in bare, aluminum, iron, tungsten and lead shielded configurations were simultaneously reconstructed using TEI. Reasonable estimates of bare, aluminum, iron and lead shield compositions were made which improved subsequent estimates of source intensities.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
