Section III. Nuclear physicsAnalysis of fissionable material using delayed gamma rays from photofission
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Cited by (29)
New measurements of cumulative photofission yields of <sup>239</sup>Pu, <sup>235</sup>U and <sup>238</sup>U with a 17.5 MeV Bremsstrahlung photon beam and progress toward actinide differentiation
2022, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentCitation Excerpt :The potential of analyzing the delayed gamma ray signal following fission to obtain an actinide identification information has already been demonstrated in the past. Hollas et al. [15] and Beddingfield et al. [16] have reported the use of delayed gamma-ray ratios for actinide differentiation, respectively for photofission and thermal neutron fission. Further experimental work conducted by Gmar et al. [17] pointed out variations of the delayed gamma-ray emissions for uranium samples of different enrichments.
Fast neutron activation of ubiquitous materials
2022, Applied Radiation and IsotopesCitation Excerpt :A number of previous studies demonstrated that observations of beta-delayed gamma rays from fission fragments can be used to distinguish fissions of 235U from that of 239Pu. Such measurements were also shown to provide information on the neutron energy spectra (Marrs et al. (2008); Iyengar et al. (2013); Swanberg et al. (2009); Beddingfield and Cecil (1998); Hollas et al. (1987)). Here we concentrate on another potential source of nuclear forensic information.
Measurement of cumulative photofission yields of <sup>235</sup>U and <sup>238</sup>U with a 16 MeV Bremsstrahlung photon beam
2021, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentCitation Excerpt :Even with well-known photofission cross-sections, relative fission product yields of these two uranium isotopes have to be determined with a good accuracy in view of their discrimination. Several research groups have shown the potential of measuring delayed gamma rays following fission for the differentiation of actinides, such as Hollas et al. [12] for photofission, Beddingfield [13] for thermal neutron fission, with the use of delayed gamma-ray ratios for actinide identification. Further experimental work was conducted by Gmar et al. [14], pointing out variations of the delayed gamma-ray emissions for uranium samples of different enrichments.
Study on a digital pulse processing algorithm based on template-matching for high-throughput spectroscopy
2015, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentCitation Excerpt :Nuclear fission is the most important multiplicative process involved in non-destructive active interrogation. Among others, unique delayed gamma-ray spectra exist for fissionable isotopes and can be used for isotopic composition measurement [4–16]. A major challenge in utilizing delayed fission gamma rays emitted after active interrogation for safeguards applications is to perform high-resolution spectroscopy measurements at an ultra-high throughput rate [17].
Simulation and measurement of delayed γ-rays after photon-induced fission
2013, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentCitation Excerpt :Such active techniques rely on neutrons or high-energy photons to induce nuclear reactions in the object under inspection. Unique signatures following induced fission are then utilized as the basis for detection and identification of nuclear materials [1–24]. On average, two to three energetic prompt neutrons and approximately eight prompt γ-rays are produced in each fission reaction.
Distinguishing fissions of <sup>232</sup>Th, <sup>237</sup>Np and <sup>238</sup>U with beta-delayed gamma rays
2013, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and AtomsCitation Excerpt :They can also be potentially used in nuclear forensics to identify the average energy of neutrons producing fission and the original fissionable isotope. Previous works measuring beta-delayed gamma-rays from neutron-induced fission focused on 238U and the major fissile isotopes, 235U and 239Pu [1–4]. However, for beta-delayed gamma-ray spectroscopy to be a useful tool, a complete set of measurements on all likely fissionable isotopes is needed.