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Distance Learning at the MS and PhD Levels in the nuclear and Radiation engineering program, nuclear and Applied Robotics, Materials science and engineering and Walker Department of Mechanical engineering at the University of Texas at Austin

Distance Learning at the MS and PhD Levels in the Nuclear an...

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2023 Transactions of the American nuclear Society Winter Conference and Expo, ANS 2023

作者： Landsberger1, Sheldon Charlton, William Clamo, Kevin Ezekoye, Ofodike Kovar, Desiderio Haas, Derek Pryor, Mitchell University of Texas at Austin Nuclear and Radiation Engineering Program Nuclear Engineering Teaching Lab 10100 Burnet Road Pickle Research Campus R-9000 AustinTX United States Walker Department of Mechanical Engineering University of Texas at Austin 204.Dean Keeton ETC II 5.160 AustinTX United States The University of Texas at Austin Materials Science and Engineering Walker Department of Mechanical Engineering 204 Dean Keeton ETC II 5.100 AustinTX United States

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Investigation of He retention in W through combined He characterization methods and cluster dynamics model

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nuclear science and Techniques 2025年第3期36卷 201-213页

作者： Jie Qiu Xun-Xiang Hu Cong-Yi Li Wendy Garcia Tan Shi Sha Xue Jamie L.Weaver HHeather Chen-Mayer Brian D.Wirth SJTU Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China Department of Nuclear Engineering University of TennesseeKnoxvilleTN 37996USA School of Physics Sichuan UniversityChengdu 610065China Oak Ridge National Laboratory Oak RidgeTN 37830USA Global Institute of Future Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049China Nuclear Engineering Program The Ohio State UniversityColumbusOH 43210USA Material Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA

Tungsten(W)is the leading plasma-facing candidate material for the International Thermonuclear Experimental Reactor and next-generation fusion *** impact of synergistic helium(He),irradiation-induced microstructural changes,and the corresponding thermal-mechanical property degradation of W are critically important but are not well understood *** the performance of W in fusion environments requires understanding the fundamentals of He-defect interactions and the resultant He bubble nucleation and growth in *** this study,He retention in helium-ion-implanted W was assessed using neutron depth profiling(NDP),laser ablation mass spectrometry(LAMS),and thermal desorption spectroscopy(TDS)following 10 keV room-temperature He implantation at various *** three experimental techniques enabled the determination of the He depth profile and retention in He-implanted W.A cluster dynamics model based on the diffusion-reaction rate theory was applied to interpret the experimental *** model successfully predicted the He spatial depth-dependent profile in He-implanted W,which was in good agreement with the LAMS *** model also successfully captured the major features of the He desorption spectra observed in the THDS *** NDP quantified total He concentration values for the samples;they were similar to those estimated by ***,the depth profiles from NDP and LAMS were not comparable due to several *** combination of modeling and experimentation enabled the identification of possible trapping sites for He in W and the evolution of He-defect clusters during the TDS thermal annealing process.

关键词： Tokamak nuclear reactor Nondestructive detection

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A Runaway Electron Avalanche Surrogate for Partially Ionized Plasmas

arXiv

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arXiv 2025年

作者： Arnaud, Jonathan S. McDevitt, Christopher J. Tang, Xian-Zhu Nuclear Engineering Program Department of Materials Science and Engineering University of Florida GainesvilleFL32611 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States

A physics-constrained deep learning surrogate that predicts the exponential "avalanche" growth rate of runaway electrons (REs) for a plasma containing partially ionized impurities is developed. Specifically, a physics-informed neural network (PINN) that learns the adjoint of the relativistic Fokker-Planck equation in steady-state is derived, enabling a rapid surrogate of the RE avalanche for a broad range of plasma parameters, motivating a path towards an ML-accelerated integrated description of a tokamak disruption. A steady-state power balance equation together with atomic physics data is embedded directly into the PINN, thus limiting the PINN to train across physically consistent temperatures and charge state distributions. This restricted training domain enables accurate predictions of the PINN while drastically reducing the computational cost of training the model. In addition, a novel closure for the relativistic electron population used when evaluating the secondary source of REs is developed that enables improved accuracy compared to a Rosenbluth-Putvinski source. The avalanche surrogate is verified against Monte Carlo simulations, where it is shown to accurately predict the RE avalanche growth rate across a broad range of plasma parameters encompassing distinct tokamak disruption scenarios. © 2025, CC BY.

关键词： Fokker Planck equation

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Local and global sensitivity analyses on the overflow probability of Abadia de Goiás radioactive near surface repository

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nuclear engineering and Design 2025年 439卷

作者： Teixeira, D.G. Frutuoso e Melo, P.F. Alvim, L.G.M. Alvim, A.C.M. Alves, A.S.M. Graduate Program of Nuclear Engineering COPPE Federal University of Rio de Janeiro RJ Rio de Janeiro Brazil Department of Computer Science Multidisciplinary Institute Federal Rural University of Rio de Janeiro UFRRJ RJ Nova Iguaçu Brazil Eletronuclear S. A. RJ Rio de Janeiro Brazil

This work presents a sensitivity analysis of the overflow probability of the near- surface radioactive repository built after the Abadia de Goiás accident, where radioactive 137Cs was released. The purpose of the analysis is to help the repository owner and the regulatory body make decisions on design parameters that affect the overflow probability. The following parameters have been considered: degradation function of the repository ceiling, internal porosity of the repository, internal area of the repository base, repository base and wall thicknesses, repository height, height of the liquid column inside the repository, average rainfall rate, evapotranspiration rate, surface runoff and hydraulic conductivity of the repository concrete. The choice for the range of each parameter is discussed. An investigation of the role of the mentioned parameters is detailed based on results obtained in a previous paper, and the dependencies among the rate parameters on the average rainfall rate is emphasized and modeled. To give a deeper perspective, local and global sensitivity analyses have been performed. In the case of global analysis, two approaches have been followed: in the first, the concept of Normalized Mutual Information and the other one leverages Shapley values derived from Light Gradient Boosting Machine and Shapley values have been used for investigating non-linearities. For some parameters the lowest values are to be considered, e.g., the repository base thickness and the average rainfall rate, while for others the highest value is desirable, like the evapotranspiration rate and the surface runoff in order to obtain lower overflow probabilities. These results should be looked with care because nonlinearities have been identified by the Shapley value analysis. Overall, the degradation function and the evapotranspiration rate emerge as the most influential parameters. The legacy of this work lies in the robust methodological framework it provides, paving the way fo

关键词： nuclear reactor accidents

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Radon and thoron in the ambient air of the caves in Bohol Island, Philippines

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nuclear engineering and Technology 2025年第10期57卷

作者： Panlaqui, Angelo A. Ballesteros, Florencio C. Dean, Kristine Marie R. Kranrod, Chutima Tokonami, Shinji Environmental Engineering Program College of Engineering University of the Philippines Diliman Diliman Quezon City 1101 Philippines Department of Science and Technology Philippine Nuclear Research Institute Commonwealth Ave. Diliman Quezon City 1101 Philippines Institute of Radiation Emergency Medicine Hirosaki University Aomori Hirosaki 036-8564 Japan

Radon and thoron concentrations in the ambient air were investigated in the caves of Bohol Island, Philippines. The study focused on Hinagdanan, Batungay, and Princess Manan-aw Caves to establish the baseline data on current radon and thoron levels and estimate the effective doses absorbed by tourists and workers during tour operations, specifically due to radon and its progeny. Radon and thoron were measured using a CR-39-based detector called the Raduet, which was placed along the cave pathways. Radon concentration inside the caves ranges from 127 to 1829 Bq m⁻³, while thoron concentration varies from 28 to 1574 Bq m⁻³. Results showed that radon levels in all three caves exceeded the recommended safety limit (300 Bq m⁻³), which may have been influenced by cave structures affecting natural ventilation. Despite the high radon concentrations in these caves, tourists are generally safe due to low exposure time. However, the estimated annual effective dose for cave guides was found to vary from 0.77 to 46.27 mSv y⁻¹. If uncontrolled, doses to occupationally exposed workers due to radon and thoron may exceed the country's national dose limit (20 mSv y⁻¹) and may increase the risks of health effects. © 2025 Korean nuclear Society

关键词： Alpha particles CR-39 Environmental radioactivity Internal radiation exposure Radiation protection

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MULTIELEMENT MATRIX ANALYSIS USING REACTOR SPECTRUM NEUTRONS

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APPLIED RADIATION AND ISOTOPES 1995年第6-7期46卷 555-556页

作者： MCGUIRE, SC HOSSAIN, TZ GOLKOWSKI, C KERNESS, ND SULCER, JD Nuclear Science and Engineering Program Cornell University Ithaca NY 14853-7701 United States Nuclear Science/Engineering Program Cornell University Ithaca NY 14853-7701 United States

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APPLICATIONS OF NEUTRON-ACTIVATION TO MICROELECTRONIC MATERIALS RESEARCH AT THE CORNELL TRIGA REACTOR

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JOURNAL OF RADIOANALYTICAL AND nuclear CHEMISTRY-ARTICLES 1995年第1期192卷 65-72页

作者： MCGUIRE, SC HOSSAIN, TZ GOLKOWSKI, C KERNESS, ND SULCER, JD Nuclear Science and Engineering Program Ward Laboratory Cornell University Ithaca USA

We present results from our use of neutron activation analysis (NAA) for the measurement and interpretation of the elemental content of materials being researched for applications in microelectronics. Examples include characterization of silicon-germanium and nickel silicide alloys, magnesium silicate crystals and ceramics for packaging of integrated circuits. High resolution delayed X-ray spectroscopy has been successfully employed as a complement to conventional gamma-ray analysis for determination of relative impurity concentrations. Fast neutron induced interferences are removed from gamma-ray spectra via the internal standard correction technique, based on the measurement of fast reaction rates.

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Antibacterial evaluation of radiolytically synthesized silver nanoparticles with ι-carrageenan stabilizers

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Radiation Physics and Chemistry 2025年 236卷

作者： Gili, Mon Bryan Z. Manuel, Wendell A. Guillermo, Neil Raymund D. Shankaregowda, Rakshith Gowda H. Phan, Manh-Huong Conato, Marlon T. Vega, Marienette M. Department of Science and Technology Philippine Nuclear Research Institute Commonwealth Avenue Diliman Quezon City1101 Philippines Materials Science and Engineering Program College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines Department of Physics University of South Florida 4202 East Fowler Avenue TampaFL33620 United States Institute of Chemistry College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines

The synthesis of silver nanoparticles (AgNPs) using green, eco-friendly methods has garnered significant attention due to the potential advantages of using natural polymers, such as ι-carrageenan, as stabilizing agents. However, challenges remain in controlling the size, distribution, and stability of the nanoparticles, as well as optimizing their antimicrobial activity. In this study, gamma irradiation of ι-carrageenan solutions was investigated as a method for synthesizing AgNPs and exploring their antimicrobial properties. The primary objective was to assess how varying radiation doses and ι-carrageenan concentrations affect the formation, size distribution, and antimicrobial activity of the AgNPs. ι-Carrageenan solutions (0.1, 0.5, and 1.0 w/v %) were mixed with 0.2 M silver nitrate (AgNO3) solutions and irradiated at doses ranging from 0 to 20 kGy using Co-60. UV–vis spectroscopic analysis indicated the successful formation of AgNPs, with surface plasmon resonance (SPR) peaks appearing between 402 and 418 nm. These peaks shifted slightly towards shorter wavelengths as the irradiation rose, signaling a reduction in nanoparticle size. The optimal synthesis of AgNPs occurred at 0.5 % ι-carrageenan concentration and a dose of 15 kGy, where the SPR peak intensity and nanoparticle formation were most pronounced. XRD confirmed the presence of silver nanoparticles with face-centered cubic (FCC) structure. Particle size analysis, using dynamic light scattering (DLS), revealed that AgNPs ranged in size from 85 to 142 nm, with smaller particles forming at higher doses. At a 1 kGy dose, the nanoparticle size averaged 114 nm, but increased doses (15–20 kGy) led to a significant reduction in particle size to 85 nm. This size reduction was attributed to the fragmentation of larger particles as the irradiation dose increased. Fourier-transform infrared (FTIR) spectroscopy showed notable changes in the ι-carrageenan structure, with the formation of new functional groups, includ

关键词： Fourier transform infrared spectroscopy

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AN ANGLE-RESOLVED TRANSLATIONAL ENERGY SPECTROMETER FOR INVESTIGATING LOW-ENERGY, HIGHLY-CHARGED ION-ATOM (MOLECULE) COLLISIONS

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REVIEW OF SCIENTIFIC INSTRUMENTS 1993年第11期64卷 3139-3146页

作者： VANCURA, J PEROTTI, JJ FLIDR, J KOSTROUN, VO Nuclear Science and Engineering Program Ward Laboratory Cornell University Ithaca New York 14853

An experimental apparatus for investigating low-collision energy gas-phase reactions of highly charged ions with atoms and molecules by angle-resolved translational energy spectroscopy is described. The basic function of the apparatus is to slow down highly charged ions extracted at 2-3 kV from the Cornell superconducting solenoid, cryogenic electron beam ion source (CEBIS) to energies below 100 qeV. The slowing down and monochromatization of the beam is done by an ion optical system that consists of two 180-degrees hemispherical electrostatic analyzers with a tuneable deceleration lens located between them. The low-energy beam available for experiments has an angular spread of 0.5-degrees and an energy spread of 0.4 qeV. The ion optical system is mounted on a 508 mm by 576 mm electrically isolated platform inside a large vacuum chamber, and the modular nature of the apparatus allows for quick and easy rearrangement of the ion optical elements for different experiments. A brief overview of in-plane scattering kinematics is given.

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THE CORNELL ELECTRON-BEAM ION-SOURCE

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IEEE TRANSACTIONS ON nuclear science 1981年第3期28卷 2660-2662页

作者： KOSTROUN, VO GHANBARI, E BEEBE, EN JANSON, SW Nuclear Science and Engineering Program Ward Laboratory Cornell University Ithaca NY USA

An electron beam ion source (EBIS) for the production of low energy, multiply charged ion beams to be used in atomic physics experiments has been designed and constructed. An external high perveance electron gun is used to launch the electron beam into a conventional solenoid. Novel features of the design include a distributed sputter ion pump to create the ultrahigh vacuum environment in the ionization region of the source and microprocessor control of the axial trap voltage supplies.

关键词： Electron beams Ion sources Production Ion beams Atomic beams Physics Solenoids Ionization Microprocessors Voltage control

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