2015
DOI: 10.1038/ncomms9592
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High-intensity power-resolved radiation imaging of an operational nuclear reactor

Abstract: Knowledge of the neutron distribution in a nuclear reactor is necessary to ensure the safe and efficient burnup of reactor fuel. Currently these measurements are performed by in-core systems in what are extremely hostile environments and in most reactor accident scenarios it is likely that these systems would be damaged. Here we present a compact and portable radiation imaging system with the ability to image high-intensity fast-neutron and gamma-ray fields simultaneously. This system has been deployed to imag… Show more

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Cited by 23 publications
(9 citation statements)
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“…In some cases, this is the difference between days of acquisition, terabytes of data, and many more hours of post-processing compared to a few hours of measurements and instantaneous results (e.g. [13]). …”
Section: Current Status Of the Technologymentioning
confidence: 99%
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“…In some cases, this is the difference between days of acquisition, terabytes of data, and many more hours of post-processing compared to a few hours of measurements and instantaneous results (e.g. [13]). …”
Section: Current Status Of the Technologymentioning
confidence: 99%
“…The controller includes an FPGA-based data acquisition card and custom-built analysis software developed in LabVIEW [7], [14]. 2) custommade de-randomizing electronics (Los Alamos National Laboratory, NM) connected to a JSR-15 multiplicity shift register (Canberra Industries Inc., CT) for the measurement of Uranium-235 enrichment in small samples of low-enriched triuranium octoxide [15], and 3) a bespoke 32-bit, 64-channel, binary counter with a serial PC interface (Lancaster University, UK) for reactor imaging [13] and neutron tomography using an isotropic source [16]. In addition, the commercially available multichannel Pulse Train Recorder (model: PTR-32) by the Institute of Isotopes (Hungarian Academy of Sciences or Energia, Budapest) is also fully compatible with the MFAx technology and offers an embedded de-randomizing function.…”
Section: A Review Of the Measurementsmentioning
confidence: 99%
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“…In the following, the feasibility of neutron detection for monitoring reactor fuel cycle activities is examined, at significant stand-off distances from a nuclear reactor. To date, there has been published work about using neutron detectors outside of reactor shielding for determining power density distribution within reactors, from escaping fast neutrons 8 . Although the preceding publication may anticipate this work, this work explicitly demonstrates how escaping fast neutrons detected as thermalized neutrons can be related to monitoring the fissile isotope inventory of a reactor core, for safeguards purposes; in particular, the stand-off neutron count rate per unit reactor power is proportional to a weighted sum of the fissile isotope inventory.…”
Section: Introductionmentioning
confidence: 99%
“…Current methods of fuel debris assay include muon tomography, a method which has been used recently at Fukushima Daiichi [7], though, unlike a neutron imaging approach, there is no information about any stimulated fission re-40 actions occurring within the core containment. Fastneutron imaging has been used in high-dose fields to characterise the fission reaction within a nuclear reactor [8], making steps towards using this technology for re-actor decommissioning. The ability to confirm localised absence of neutron emitting materials is also practical for decommissioning purposes and may be applicable to some nuclear safeguards applications.…”
Section: Introductionmentioning
confidence: 99%