Detectors for Active Interrogation Applications [electronic resource].
- Washington, D.C. : United States. National Nuclear Security Administration, 2017. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 266-270 : digital, PDF file
- Additional Creators:
- United States. National Nuclear Security Administration and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Active interrogation creates an environment that is particularly challenging from a radiation-detection standpoint: the elevated background levels from the source can mask the desired signatures from the SNM. Neutron based interrogation experiments have shown that nanosecond-level timing is required to discriminate induced-fission neutrons from the scattered source neutrons. Previous experiments using high-energy bremsstrahlung X-rays have demonstrated the ability to induce and detect prompt photofission neutrons from single target materials; however, a real-world application would require spectroscopic capability to discern between photofission neutrons emitted by SNM and neutrons emitted by other reactions in non-SNM. Using digital pulseshape discrimination, organic liquid scintillators are capable of reliably detecting neutrons in an intense gamma-ray field. Photon misclassification rates as low as 1 in 10<sup>6</sup> have been achieved, which is approaching the level of gaseous neutron detectors such as <sup>3</sup>He without the need for neutron moderation. These scintillators also possess nanosecond-timing resolution, making them candidates for both neutron-and photon-driven active interrogation systems. Lastly, we have applied an array of liquid and NaI(Tl) scintillators to successfully image 13.7 kg of HEU interrogated by a DT neutron generator; the system was in the direct presence of the accelerator during the experiment.
- Published through SciTech Connect., 10/26/2017., ": S1875389217301657", Physics Procedia 90 C ISSN 1875-3892 AM, S. D. Clarke; M. C. Hamel; M. M. Bourne; S. A. Pozzi., and Univ. of Michigan, Ann Arbor, MI (United States)
- Funding Information:
View MARC record | catkey: 24048645