FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W24765854> ?p ?o ?g. }

• W24765854 abstract "This dissertation examines the measurement of nuclear resonance fluorescence gamma-rays as a technique to non-destructively determine isotopic compositions of target materials that are of interest for nuclear security applications. The physical processes that can result in non-resonant background to nuclear resonance fluorescence measurements are described and investigated using a radiation transport computer code that relies on the Monte Carlo technique, MCNPX. The phenomenon of nuclear resonance fluorescence is discussed with consideration of the angular distributions of resonance emissions, the effects of nuclear recoil, and the influence of thermal motion.Models describing two ways of measuring nuclear resonance fluorescence rates in materials are considered. First the measurement of back-scattered photons is considered. In this type of measurement, the portion of the interrogating photon beam that is scattered into large relative angles is measured. When the radioactivity of the target can be overcome by shielding or by use of intense photon sources, direct measurement of gamma-rays, emitted during nuclear resonance fluorescence can provide quantitative signatures that appear to be useful for applications such as forensic age-dating of large radiological sources. However, if the target radioactivity is too intense, as in the case for most spent nuclear fuel, a second measurement type, where indirect measurement of transmitted resonant-energy photons can also provide quantitative information. This method allows radiation detectors to be better-shielded from target radioactivity, but suffers from a slower accrual rate of statistical confidence. The models described herein indicate that very intense photon sources and large high-resolution detector arrays would be needed to measure 239 Pu content in spent fuel to precisions desired by nuclear safeguards organizations. However, the rates at which statistics accrue are strongly proportional to the strengths of the resonances, and measurement of a plutonium isotope with stronger resonances may provide more practical measurement rates.The model for predicting relative detection rates of nuclear resonance fluorescence gamma-rays in the transmission measurement was experimentally tested using the 238 U in a mixture of depleted uranium and lead as a surrogate for 239 Pu in spent fuel. The experiment indicated that the model was approximately correct, but that the process of notch refilling, which was excluded from the initial model, appears to be visible. Data files of the computer code, MCNPX, were modified to allow for nuclear resonance fluorescence to be simulated and a bug in the code was repaired to allow the code to more accurately simulate non-resonant elastic photon scattering. Simulations using this modified version of MCNPX have indicated that the magnitude of the notch refill process is comparable to that of the difference between the analytical model and the experimental data." @default.
• W24765854 created "2016-06-24" @default.
• W24765854 creator A5026092031 @default.
• W24765854 date "2010-01-01" @default.
• W24765854 modified "2023-09-27" @default.
• W24765854 title "Nuclear Resonance Fluorescence for Nuclear Materials Assay" @default.
• W24765854 cites W130567934 @default.
• W24765854 cites W1518780150 @default.
• W24765854 cites W1584522294 @default.
• W24765854 cites W1597388945 @default.
• W24765854 cites W1608527739 @default.
• W24765854 cites W1620173905 @default.
• W24765854 cites W1650310283 @default.
• W24765854 cites W1965640232 @default.
• W24765854 cites W1969159587 @default.
• W24765854 cites W1970580581 @default.
• W24765854 cites W1973002125 @default.
• W24765854 cites W1978211931 @default.
• W24765854 cites W1987591160 @default.
• W24765854 cites W1989611624 @default.
• W24765854 cites W1991319227 @default.
• W24765854 cites W1994352125 @default.
• W24765854 cites W1996179889 @default.
• W24765854 cites W1996734705 @default.
• W24765854 cites W1996830396 @default.
• W24765854 cites W2005662164 @default.
• W24765854 cites W2009004192 @default.
• W24765854 cites W2010343022 @default.
• W24765854 cites W2013277356 @default.
• W24765854 cites W2028334081 @default.
• W24765854 cites W2030381641 @default.
• W24765854 cites W2035607724 @default.
• W24765854 cites W2035640496 @default.
• W24765854 cites W2037498351 @default.
• W24765854 cites W2037993680 @default.
• W24765854 cites W2044578741 @default.
• W24765854 cites W2048700351 @default.
• W24765854 cites W2050427519 @default.
• W24765854 cites W2056722718 @default.
• W24765854 cites W2060920851 @default.
• W24765854 cites W2062508874 @default.
• W24765854 cites W2063045205 @default.
• W24765854 cites W2064253866 @default.
• W24765854 cites W2067537996 @default.
• W24765854 cites W2070126606 @default.
• W24765854 cites W2073801535 @default.
• W24765854 cites W2080189619 @default.
• W24765854 cites W2087622364 @default.
• W24765854 cites W2095426959 @default.
• W24765854 cites W2126270633 @default.
• W24765854 cites W2128158076 @default.
• W24765854 cites W2131320621 @default.
• W24765854 cites W2140630293 @default.
• W24765854 cites W2154990266 @default.
• W24765854 cites W2156407052 @default.
• W24765854 cites W2286551563 @default.
• W24765854 cites W2561925472 @default.
• W24765854 cites W2603446729 @default.
• W24765854 cites W2782212413 @default.
• W24765854 cites W29422689 @default.
• W24765854 cites W2990773795 @default.
• W24765854 cites W3199326566 @default.
• W24765854 cites W34404595 @default.
• W24765854 cites W71807668 @default.
• W24765854 hasPublicationYear "2010" @default.
• W24765854 type Work @default.
• W24765854 sameAs 24765854 @default.
• W24765854 citedByCount "3" @default.
• W24765854 countsByYear W247658542016 @default.
• W24765854 crossrefType "journal-article" @default.
• W24765854 hasAuthorship W24765854A5026092031 @default.
• W24765854 hasConcept C105795698 @default.
• W24765854 hasConcept C120665830 @default.
• W24765854 hasConcept C121332964 @default.
• W24765854 hasConcept C139210041 @default.
• W24765854 hasConcept C159317903 @default.
• W24765854 hasConcept C184779094 @default.
• W24765854 hasConcept C185544564 @default.
• W24765854 hasConcept C19499675 @default.
• W24765854 hasConcept C2265751 @default.
• W24765854 hasConcept C2776668124 @default.
• W24765854 hasConcept C33923547 @default.
• W24765854 hasConcept C46141821 @default.
• W24765854 hasConcept C62520636 @default.
• W24765854 hasConcept C7910260 @default.
• W24765854 hasConcept C91881484 @default.
• W24765854 hasConcept C94587425 @default.
• W24765854 hasConcept C94915269 @default.
• W24765854 hasConceptScore W24765854C105795698 @default.
• W24765854 hasConceptScore W24765854C120665830 @default.
• W24765854 hasConceptScore W24765854C121332964 @default.
• W24765854 hasConceptScore W24765854C139210041 @default.
• W24765854 hasConceptScore W24765854C159317903 @default.
• W24765854 hasConceptScore W24765854C184779094 @default.
• W24765854 hasConceptScore W24765854C185544564 @default.
• W24765854 hasConceptScore W24765854C19499675 @default.
• W24765854 hasConceptScore W24765854C2265751 @default.
• W24765854 hasConceptScore W24765854C2776668124 @default.
• W24765854 hasConceptScore W24765854C33923547 @default.
• W24765854 hasConceptScore W24765854C46141821 @default.

• next