Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (12)
- Nuclear Engineering (8)
- Atomic, Molecular and Optical Physics (4)
- Elementary Particles and Fields and String Theory (4)
- Atmospheric Sciences (3)
-
- Chemistry (3)
- Computer Sciences (3)
- Electrical and Computer Engineering (3)
- Oceanography and Atmospheric Sciences and Meteorology (3)
- Astrophysics and Astronomy (2)
- Biological and Chemical Physics (2)
- Education (2)
- Electrical and Electronics (2)
- Inorganic Chemistry (2)
- Life Sciences (2)
- Medicine and Health Sciences (2)
- Microbiology (2)
- Public Health (2)
- Science and Mathematics Education (2)
- Automotive Engineering (1)
- Aviation (1)
- Bacteriology (1)
- Chemical Engineering (1)
- Curriculum and Instruction (1)
- Curriculum and Social Inquiry (1)
- Data Science (1)
- Defense and Security Studies (1)
- Keyword
-
- Gamma rays (5)
- Bacteria (3)
- Ionizing radiation (3)
- Monte Carlo Method (3)
- Neutron transport theory (3)
-
- Nuclear reactions (3)
- Nuclear structure (3)
- Positronium (3)
- Algorithms (2)
- Cesium (2)
- Deoxyribonucleic acids (2)
- Detector (2)
- Dose Rate (2)
- Energy transfer (2)
- Fallout (2)
- Fast neutrons (2)
- Ions (2)
- MCNP (2)
- Neutron detectors (2)
- Neutron flux (2)
- Neutron spectroscopy (2)
- Neutron spectrum (2)
- Neutron spectrum unfolding (2)
- Neutrons (2)
- Nuclear (2)
- Nuclear Weapons (2)
- Nuclear physics (2)
- Positron (2)
- Positron annihilation spectroscopy (2)
- Spectroscopy (2)
- Publication Year
- Publication
- Publication Type
Articles 91 - 96 of 96
Full-Text Articles in Nuclear
Collisional Effects In The Absorption Spectra Of The Oxygen A Band And Nitric Oxide Fundamental Band, Robert S. Pope
Collisional Effects In The Absorption Spectra Of The Oxygen A Band And Nitric Oxide Fundamental Band, Robert S. Pope
Theses and Dissertations
Fourier transform spectroscopy was used to measure pressure broadening coefficients in the absorption spectra of both the oxygen A band and the nitric oxide fundamental band. Oxygen spectra were recorded with O2, N2, CO, CO2, SF6 and noble gas collision partners, while nitric oxide spectra were recorded using noble gas collision partners. Pressure broadening coefficients were determined in the P and R branches for every resolved line for each of the fifteen collision pairs studied. In addition, broadening coefficients and qualitative evidence of line coupling were found for the Q branch of NO …
Reduced Computational Cost, Totally Symmetric Angular Quadrature Sets For Discrete Ordinates Radiation Transport, Joseph M. Oder
Reduced Computational Cost, Totally Symmetric Angular Quadrature Sets For Discrete Ordinates Radiation Transport, Joseph M. Oder
Theses and Dissertations
Several new quadrature sets for use in the discrete ordinates method of solving the Boltzmann neutral particle transport equation are derived. These symmetric quadratures extend the traditional symmetric quadratures by allowing ordinates perpendicular to one or two of the coordinate axes. Comparable accuracy with fewer required ordinates is obtained. Quadratures up to seventh order are presented. The validity and efficiency of the quadratures is then tested and compared with the Sn level symmetric quadratures relative to a Monte Carlo benchmark solution. The criteria for comparison include current through the surface, scalar flux at the surface, volume average scalar flux, and …
An Analytical Method To Calculate Activity From Measurements Affected By Coincidence Summing, Anthony P. Popovich
An Analytical Method To Calculate Activity From Measurements Affected By Coincidence Summing, Anthony P. Popovich
Theses and Dissertations
An analytical method is developed and applied to find the activities of two radioisotopes based on measurements influenced by true coincidence summing. The method incorporates the solid angle subtended by the detector, the macroscopic cross sections of the materials present, the absolute peak and total efficiencies of the detector, and the modes and probabilities of decay of the radioisotope. With this information, the method corrects for both summing-in and summing-out events. Summing events affect peak counts and cause the calculated activity to differ from the true activity. Thin disk sources of Mo-99 and Cs-136 on the face of a closed-end, …
Analysis Of Uranium Oxide Weathering By Molecular Spectroscopy, Matthew S. Zickafoose
Analysis Of Uranium Oxide Weathering By Molecular Spectroscopy, Matthew S. Zickafoose
Theses and Dissertations
A preliminary study of the weathering of uranium oxide particles diluted in diamond dust at ambient environmental conditions is presented. The primary weathering reaction is oxidation of the uranium from the 4 to 6 oxidation state, although formation of compounds such as carbonates and hydroxides is possible. Identification of the state of uranium oxide has been attempted using luminescence spectroscopy and diffuse reflectance Fourier transform infrared spectroscopy DRIFTS. Luminescence spectra of nominal samples of three common oxides, UO3, U3O8, and UO2, have been measured showing significant spectral differences in peaks at 494 nm, 507 nm, 529 nm, and 553 nm. …
Determining The Effects Of Waste Coal Ash On Landfill Radon Levels, Richard S. Krysiak Jr.
Determining The Effects Of Waste Coal Ash On Landfill Radon Levels, Richard S. Krysiak Jr.
Theses and Dissertations
Coal contains trace amounts of the primary radionuclides 40K, and elements of the 4n (232Th), 4n+2 (238U), and 4n+3 (235U) series including 220Rn and 222Rn. Combustion of coal by electric power and heat plants result in concentration of noncombustible mineral matter, including most of the radionuclides, in the coal ash. The increased radiation due to the concentration of radionuclides is known as technologically enhanced natural radiation. The purpose of this research was to determine the effects of landfilled coal ash on one specific aspect of technologically enhanced natural radiation, radon levels. …
Feasibility Exploration Of Throughfold As A Predictor For Target Loading And Associated Error Bounds, Kris G. Rongone
Feasibility Exploration Of Throughfold As A Predictor For Target Loading And Associated Error Bounds, Kris G. Rongone
Theses and Dissertations
Various applications of the Fredholm integral equation appear m different fields of study. An application of particular interest to the Air Force arises in determination of target loading from nuclear effects simulations. Current techniques first unfold the incident spectrum then determine target loading; resulting spectrum and loading are assumed exact. This study investigates the feasibility of a new method, through-fold, for directly determining defensible error bounds on target loading. Through-fold uses a priori information to define input data and represents target response with a linear combination of instrument responses plus a remainder to derive a quadratic expression for exact target …