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Angell, C.; 早川 岳人; 静間 俊行; 羽島 良一; Quiter, B. J.*; Ludewigt, B. L.*; Karwowski, H. J.*; Rich, G.*; Silano, J.*
Proceedings of INMM 56th Annual Meeting (Internet), 9 Pages, 2015/07
Nuclear resonance fluorescence (NRF) is a promising technique for assaying 
Pu in spent nuclear fuel and for SNM detection applications because of its isotope-specific nature and potential for high sensitivity. To fully utilize the next generation of high-flux 
-ray sources for NRF applications we developed the integral resonance transmission (IRT) method which integratesover all resonances within the energy width of a quasi-monoenergetic -ray beam allowing the full utilization of the transmission signature. To realize the IRT technique both conceptual studies, exploring the consequences of the loss of resolution, and experimental studies, demonstrating several aspects of the IRT method, were undertaken. The conceptual studies included the development of a performance metric allowing comparison between using the IRT technique and single resonances, a study of the magnitude of resonance overlap, and beam simulations examining performance as a function of beam width. The experimental studies were done at the HIS facility at Duke University, and included an experiment constraining resonance overlap in a NRF transmission measurement through a TMI-2 type canister, demonstration of the IRT technique by a NRF measurement on 
Ta, and the world's first transmission NRF measurement on Pu. In this talk, we will overview each component of the conceptual and experimental studies for the IRT method.
Pu in spent and melted fuel using the nuclear resonance fluorescence integral resonance transmission methodAngell, C.; 早川 岳人; 静間 俊行; 羽島 良一; Quiter, B. J.*; Ludewigt, B. L.*; Karwowski, H.*; Rich, G.*
Nuclear Physics and -ray sources for Nuclear Security and Nonproliferation, p.133 - 141, 2014/12
Non-destructive assay (NDA) of Pu in spent nuclear fuel is possible using the isotope-specific nuclear resonance fluorescence (NRF) integral resonance transmission (IRT) method. The IRT method measures the absorption of photons from a quasi-monoenergetic -ray beam due to all resonances in the energy width of the beam. According to calculations the IRT method could greatly improve assay times for Pu in nuclear fuel. To demonstrate and verify the IRT method, we first measured the IRT signature in Ta, and subsequently made IRT measurements in Pu. These measurements were done using the quasi-monoenergetic beam at the High Intensity -ray Source (HIS) in Durham, NC, USA. The IRT signature was observed as a decrease in scattering strength when the same isotope material was placed in the beam line upstream of the scattering target. The results confirm the validity of the IRT method in both Ta and Pu.
Angell, C.; 早川 岳人; 静間 俊行; 羽島 良一; Quiter, B. J.*; Ludewigt, B. L.*; Karwowski, H.*; Rich, G.*
Proceedings of INMM 54th Annual Meeting (CD-ROM), 7 Pages, 2013/07
Non-destructive assay (NDA) of Pu in spent nuclear fuel is possible using the isotope-specific nuclear resonance fluorescence (NRF) integral resonance transmission (IRT) method. The IRT method measures the absorption of photons from a quasi-monoenergetic -ray beam due to all resonances in the energy width of the beam. According to calculations the IRT method could greatly improve assay times for Pu in nuclear fuel. To demonstrate and verify the IRT method, we measured the IRT signature in a simulant material, Ta, whose nuclear resonant properties are similar to those of Pu. Measurements were made at beam energies of 2.27 and 2.75 MeV, using metallic Ta for both the absorption and scattering targets. The scattered radiation was measured using HPGe and LaBr detectors. The results confirm the validity of the IRT method and a similar result is expected on Pu.
