2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) 2014
DOI: 10.1109/nssmic.2014.7431171
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First-order numerical optimization of fission-chamber coatings using natural uranium and thorium

Abstract: Presently, fission chamber technology utilizes neutron-sensitive coatings often composed of radioisotopes that are becoming increasingly difficult to obtain. Using only natural uranium and thorium, a maximized stable device lifetime in a constant neutron flux can be obtained by optimizing the regenerative fission chamber coating. A system of coupled differential equations was developed by considering neutroninduced fission, neutron absorption, and radioactive decay of 17 radioisotopes spanning the product fami… Show more

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Cited by 2 publications
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“…5. Notably, the TRIGA Mk II nuclear reactor spectrum as computed here differs substantially from the spectrum assumed in previous scoping studies, which severely under-predicted the epithermal flux and led to different optimum compositions [7].…”
Section: Neutron-conversion Materials Lifetime Calculationmentioning
confidence: 62%
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“…5. Notably, the TRIGA Mk II nuclear reactor spectrum as computed here differs substantially from the spectrum assumed in previous scoping studies, which severely under-predicted the epithermal flux and led to different optimum compositions [7].…”
Section: Neutron-conversion Materials Lifetime Calculationmentioning
confidence: 62%
“…Additionally, "triad MPFDs" capable of distinguishing between thermal-neutron, fast-neutron, and gamma-ray flux were designed and simulated [6]. Finally, by optimizing the neutron-conversion material composition (mixing fissile and fertile materials), stable detector response can be achieved for high neutron fluences [7]. Although the prototype detectors did show favorable characteristics [3,4], and simulations indicated that MPFDs could be used to extract real-time data for in-core testing [6], little progress was made towards the repeatable fabrication and characterization of MPFDs after these initial results.…”
Section: Figure 1 Here Figure 2 Herementioning
confidence: 99%
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