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Activation of Tl, Pb and Bi by 10-160 MeV Neutrons: Possible Application to the Analysis of Bi
The medium energy intense neutrons (MEIN) available at the Brookhaven Chemistry Linac Irradiation Facility have an energy distribution up to approx. 160 MeV and an effective neutron flux of approx. 1.3 x 10/sup 11/ cm/sup -2/ s/sup -1/. The present work explores the feasibility of using this facility for the analysis of Tl, Pb and Bi by activation with MEIN. The most sensitive reactions, from a practical standpoint, were found to be Tl (n, xn) /sup 200/Tl (x = 4, 6), Pb (n, xn) /sup 204//sup m/Pb (x = 0, 3, 4, 5) and /sup 209/Bi (n, 6n) /sup 204/Bi. The absolute sensitivities attainable with these reactions are 0.1, 0.05 and 0.08 ..mu..g of Tl, Pb and Bi respectively, for 1 h irradiation at 1.3 x 10/sup 11/ n cm/sup -2/ s/sup -1/ with samples counted 2 h after the end of irradiation. The advantages of the method over thermal neutron activation analysis are that all three elements can be assayed at the sub-microgram concentration levels by ..gamma..-spectrometry with the help of a simple radiochemical purificaton and the analytical results can be verified by cross checking via the multiple (n, xn) reaction products. However, interference from Bi in the determination …
Date:
January 1, 1981
Creator:
Parekh, P. P. & Finston, H. L.
Object Type:
Article
System:
The UNT Digital Library
Active nondestructive assay of nuclear materials: principles and applications
The purpose of this book is to present, coherently and comprehensively, the wealth of available but scattered information on the principles and applications of active nondestructive analysis (ANDA). Chapters are devoted to the following: background and overview; interactions of neutrons with matter; interactions of ..gamma..-rays with matter; neutron production and sources; ..gamma..-ray production and sources; effects of neutron and ..gamma..-ray transport in bulk media; signatures of neutron- and photon-induced fissions; neutron and photon detection systems and electronics; representative ANDA systems; and instrument analysis, calibration, and measurement control for ANDA. Each chapter has an introductory section describing the relationship of the topic of that chapter to ANDA. Each chapter ends with a section that summarizes the main results and conclusions of the chapter, and a reference list.
Date:
January 1, 1981
Creator:
Gozani, Tsahi
Object Type:
Report
System:
The UNT Digital Library
Active solar heating and cooling information user study
The results of a series of telephone interviews with groups of users of information on active solar heating and cooling (SHAC). An earlier study identified the information user groups in the solar community and the priority (to accelerate solar energy commercialization) of getting information to each group. In the current study only high-priority groups were examined. Results from 19 SHAC groups respondents are analyzed in this report: DOE-Funded Researchers, Non-DOE-Funded Researchers, Representatives of Manufacturers (4 groups), Distributors, Installers, Architects, Builders, Planners, Engineers (2 groups), Representatives of Utilities, Educators, Cooperative Extension Service County Agents, Building Owners/Managers, and Homeowners (2 groups). The data will be used as input to the determination of information products and services the Solar Energy Research Institute, the Solar Energy Information Data Bank Network, and the entire information outreach community should be preparing and disseminating.
Date:
January 1981
Creator:
Belew, W. W.; Wood, B. L.; Marle, T. L. & Reinhardt, C. L.
Object Type:
Report
System:
The UNT Digital Library
ACTVE News, Volume 12, Number 1, January 1981
Newsletter issued by the Advisory Council for Technical-Vocational Education in Texas discussing news, events, and other relevant information related to technical and vocational education for adults in Texas.
Date:
January 1981
Creator:
Advisory Council for Technical-Vocational Education in Texas
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Adaptive-grid methods for time-dependent partial differential equations
This paper contains a survey of recent developments of adaptive-grid algorithms for time-dependent partial differential equations. Two lines of research are discussed. One involves the automatic selection of moving grids to follow propagating waves. The other is based on stationary grids but uses local mesh refinement in both space and time. Advantages and disadvantages of both approaches are discussed. The development of adaptive-grid schemes shows promise of greatly increasing our ability to solve problems in several spatial dimensions.
Date:
January 1, 1981
Creator:
Hedstrom, G.W. & Rodrique, G.H.
Object Type:
Article
System:
The UNT Digital Library
Addison Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24,000
Date:
1981
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
[Adolphus Hotel]
Photograph of the Adolphus Hotel (located at 1323 Commerce St) in Dallas, Texas.
Date:
January 1, 1981
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
Adsorptive behavior of polycyclic aromatic hydrocarbons in coal-conversion wastewaters. Six months progress report
A coupled column system was designed and assembled for use in solubility and adsorption testing. This system consists of a saturated solution generation column and an adsorption column. The generation column has been employed successfully to determine the solubility behavior of naphthalene; for nine determinations at 25 /sup 0/C the aqueous solubility is 32.9 +- 1.2 milligrams per liter. However, adsorption isotherm data obtained from the coupled column system involved techniques which are limited by time constraints and accuracy. Batch adsorption shake testing using the generation column to prepare solutions offers an acceptable alternative to this sytem. This procedure has been employed to obtain adsorption isotherm data for naphthalene. Thirty-one data points were obtained for equilibrium concentrations from 0.00689 to 18.8 milligrams per liter. These data can be fitted to the Freundlich equation with constant values of 263 for the coefficient and 0.39 for the exponent. Adsorption and adsorption isotherm models which are more appropriate than the Freundlich equation for purposes of detailed modelling are reviewed.
Date:
January 1, 1981
Creator:
Walters, Richard W. & Luthy, Richard G.
Object Type:
Report
System:
The UNT Digital Library
Advanced concepts under development in the United States Breeder-Fuel-Reprocessing Program
Advanced concepts and techniques for the fuel reprocessing step are being developed. These concepts have been incorporated into the conceptual design of a Hot Experimental Facility (HEF), which is intended to demonstrate reprocessing of the first US breeder demonstration reactor. To achieve system reliability and reduce occupational doses, a concept of totally remote operation and maintenance (termed Remotex) has been conceived and is being developed. In this concept, maintenance and mechanical operations are accomplished with remotely operated bilateral force-reflecting electronic master/slave manipulators. Suitable transport systems, coupled with remote closed-circuit television viewing, are provided to extend man's capabilities into the hostile cell environment. New equipment concepts are being developed for the fuel dismantling and shearing step, a high-temperature dry process termed voloxidation to remove tritium, a continuous rotary dissolver, and for an improved centrifugal solvent contractor. Techniques have been developed, using engineering-scale equipment with active tracers for retention of /sup 85/Kr, radioiodine, /sup 14/C, and /sup 3/H.
Date:
January 1, 1981
Creator:
Burch, W.D.
Object Type:
Article
System:
The UNT Digital Library
Advanced development of electrical-energy-storage components for high-reliability applications
This program was undertaken in order to study the following: (1) design and fabrication of prototype test capacitors; (2) dc partial discharge analysis; (3) repetitive charge-discharge life testing; (4) theoretical and experimental analysis; and (5) computer modeling. A brief overview of each of these program elements is presented. (MOW)
Date:
1981
Creator:
Bickford, K. J.; Mauldin, G. H. & Sargeant, W. J.
Object Type:
Article
System:
The UNT Digital Library
Advanced fuel concepts and applications
Despite their more stringent plasma heating and confinement requirements, advanced fuel (AF) fusion cycles potentially offer improved environmental compatibility and lower costs. This comes about by elimination of tritium breeding requirements and by a reduction in neutron flux (hence, activation and radiation damage). Also a larger energy fraction carried by charged particles makes direct energy conversion more suitable. As a first application, a symbiotic system of semi-catalyzed-deuterium fueled hybrid fuel factories, supplying both fissle fuel to light water reactors and /sup 3/He to D-/sup 3/He satellite fusion reactors, is proposed. Subsequently, an evolution into a system of synfuel factories with satellite D-/sup 3/He reactors is envisioned.
Date:
January 1, 1981
Creator:
Miley, George H.
Object Type:
Article
System:
The UNT Digital Library
Advanced pulverized-coal combustor for control of NO/sub x/ emissions. Second quarterly report, December 25, 1980-April 3, 1981
Second quarter results under the Advanced Pulverized Coal Combustor for Control of NO/sub x/ Emissions Program are reported. The program uses an idealized one-dimensional combustor, incorporating fuel staging. A comprehensive computer model is being developed under the program to allow NO mechanisms and rates to be extracted from the experimental data. During the quarter, modification of the existing PROF code to include particle effects was begun. Various aspects of the solution procedure are described in this report. Refinements in the kinetic thermochemical data are completed, providing satisfactory agreement between calculated NO predictions and selected experimental data. Combustor mechanical design was described last quarter. The heat transfer analysis used in the design of the combustor is reported herein. Initial combustion tests will be run next quarter.
Date:
January 1, 1981
Creator:
Pam, R. L.; Suttmann, S. T.; Kelly, J. T. & Chu, E. K.
Object Type:
Report
System:
The UNT Digital Library
Advanced thermionic technology program. Progress report No. 47, April, May, June 1981
The primary long-term goal is to improve thermionic performance to the level that thermionic topping of fossil-fuel powerplants becomes technically possible and economically attractive. An intermediate goal is to operate a thermionic module in a power plant during the mid-1980's. A short-term goal is to demonstrate reliable thermionic operation in a combustion environment. Progress made during the three-month period from April through June 1981 is reported. During this period, significant accomplishments include: (1) continuing stable output from the combustion test of the one-inch diameter hemispherical silicon carbide diode (Converter No. 239) at an emitter temperature of 1730 K for a period of over 8500 hours; (2) determination of the elemental composition (i.e., molybdenum, nickel and cesium) through the sublimed molybdenum collector of Converter No. 262; and (3) demonstration of tungsten CVD onto molybdenum flange using a reuseable graphite mandrel.
Date:
January 1, 1981
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced thermochemical hydrogen cycles
The overall objective of this program is to contribute to the development of practical thermochemical cycles for the production of hydrogen from water. Specific goals are: investigate and evaluate the technical and economic viability of thermochemical cycles as an advanced technology for producing hydrogen from water; investigate and evaluate the engineering principles involved in interfacing individual thermochemical cycles with the different thermal energy sources (high temperature fission, solar, and fusion); and conduct a continuing research and development effort to evaluate the use of solid sulfates, oxides and other compounds as potentially advanced cycles and as alternates to H/sub 2/SO/sub 4/ based cycles. Basic thermochemistry studies have been completed for two different steps in the decomposition of bismuth sulfate. Two different bismuth sulfate cycles have been defined for different sulfuric acid strengths. The eventual best cycle will depend on energy required to form sulfuric acid at different concentrations. A solids decomposition facility has been constructed and practical studies of solid decompositions are being conducted. The facility includes a rotary kiln system and a dual-particle fluidized bed system. Evaluation of different types of cycles for coupling with different heat sources is continuing.
Date:
January 1, 1981
Creator:
Hollabaugh, C.M. & Bowman, M.G.
Object Type:
Article
System:
The UNT Digital Library
Advances in automated noise data acquisition and noise source modeling for power reactors
A newly expanded program, directed toward achieving a better appreciation of both the strengths and limitations of on-line, noise-based, long-term surveillance programs for nuclear reactors, is described. Initial results in the complementary experimental (acquisition and automated screening of noise signatures) and theoretical (stochastic modeling of likely noise sources) areas of investigation are given.
Date:
January 1, 1981
Creator:
Clapp, N. E., Jr.; Kryter, R. C.; Sweeney, F. J. & Renier, J. A.
Object Type:
Article
System:
The UNT Digital Library
[Advertisement: "Two Of The Best"]
Newspaper clipping with an advertisement for Ken's Man's Shop, "Two Of The Best," 1981.
Date:
1981
Creator:
unknown
Object Type:
Clipping
System:
The UNT Digital Library
Advisory Council for Technical-Vocational Education in Texas Annual Report: 1980
Annual report of the Advisory Council for Technical-Vocational Education in Texas describing goals, activities, and accomplishments during fiscal year 1980.
Date:
1981
Creator:
Advisory Council for Technical-Vocational Education in Texas
Object Type:
Report
System:
The Portal to Texas History
Aerial Gamma Ray and Magnetic Survey, Danville Quadrangle, Indiana and Illinois: Final Report
Final report analyzing aerial gamma ray and magnetic data in the Danville quadrangle, including a detailed geologic summary, interpretation report, reduced scale copies of all maps and profiles, histograms, and statistical tables for the quadrangle.
Date:
January 1981
Creator:
EG & G GeoMetrics
Object Type:
Report
System:
The UNT Digital Library
Aerial Gamma Ray and Magnetic Survey, Fort Dodge Quadrangle, Iowa: Final Report
Final report analyzing aerial gamma ray and magnetic data in the Fort Dodge quadrangle, including a detailed geologic summary, interpretation report, reduced scale copies of all maps and profiles, histograms, and statistical tables for the quadrangle.
Date:
January 1981
Creator:
EG & G GeoMetrics
Object Type:
Report
System:
The UNT Digital Library
Aerial Gamma Ray and Magnetic Survey, Fort Wayne Quadrangle, Indiana, Ohio and Michigan: Final Report
Final report analyzing aerial gamma ray and magnetic data in the Fort Wayne quadrangle, including a detailed geologic summary, interpretation report, reduced scale copies of all maps and profiles, histograms, and statistical tables for the quadrangle.
Date:
January 1981
Creator:
EG & G GeoMetrics
Object Type:
Report
System:
The UNT Digital Library
Aerial Gamma Ray and Magnetic Survey, Omaha Quadrangle, Iowa and Nebraska: Final Report
Final report analyzing aerial gamma ray and magnetic data in the Omaha quadrangle, including a detailed geologic summary, interpretation report, reduced scale copies of all maps and profiles, histograms, and statistical tables for the quadrangle.
Date:
January 1981
Creator:
EG & G GeoMetrics
Object Type:
Report
System:
The UNT Digital Library
Aerial Photograph of Elmwood Memorial Garden (Abilene, Texas)
An aerial photograph of Elmwood Memorial Garden (Now Elmwood Memorial Park), located near the intersection of US 277 and Twilight Trail in Abilene, Texas. The photo was taken by Abilene photographer Don Hutcheson.
Date:
1981
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Elmwood Memorial Garden (Abilene, Texas)
An aerial photograph of Elmwood Memorial Garden (Now Elmwood Memorial Park), located near the intersection of US 277 and Twilight Trail in Abilene, Texas. The photo was taken by Abilene photographer Don Hutcheson.
Date:
1981
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Elmwood Memorial Garden (Abilene, Texas)
An aerial photograph of Elmwood Memorial Garden (Now Elmwood Memorial Park), located near the intersection of US 277 and Twilight Trail in Abilene, Texas. The photo was taken by Abilene photographer Don Hutcheson.
Date:
1981
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History