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Updated: Jun 2, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
Neutron interrogation of shielded/unshielded uranium by a 4 MeV linac
L Lakosi1, C Tam Nguyen, E Serf
1Institute of Isotopes, Hungarian Academy of Sciences, Budapest, Hungary. lakosi@iki.kfki.hu
Abstract:
A non-destructive active assay method was developed for revealing illicit trafficking of uranium. Photoneutrons produced in beryllium or heavy water by bremsstrahlung from a linac induced fission in the samples. Delayed fission neutrons were detected by a neutron collar built up of (3)He counters embedded in polyethylene moderator. High-enriched uranium samples shielded and unshielded by lead up to 14 mm thickness were detected, with a performance practically unaltered. 25 mg (235)U can be revealed in a 1 min interrogation time.
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