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15 MeV neutron damage in Cu and Nb
An investigation was made of high-energy neutron damage in Cu and Nb irradiated with approximately 15 MeV neutrons at the Oak Ridge Isochronous Cyclotron. The neutrons were generated by bombarding a thick Be target with 40- MeV deuterons resulting in a high energy neutron spectrum broadly peaked at 15 MeV. Single crystals of Cu and Nb were irradiated at room temperature to fluences of approximately 2 x 10$sup 17$ n/cm$sup 2$. The resulting loop-type defect clusters in the crystals were characterized using x-ray diffuse scattering and transmission electron microscopy. The cluster size distributions were found to be generally similar to those characteristic of fission neutron irradiations in these materials and no multiple clusters or sub-clusters were observed. Additional comparisons with fission reactor irradiations in Cu and Nb indicate that the retained displacement damage in these crystals is approximately 3 times greater for the high-energy neutrons than for an equivalent fluence of fission neutrons. This result is consistent with detailed damage energy calculations for the Be(d,n) neutron spectrum. (auth)
Date:
January 1, 1975
Creator:
Roberto, J. B.; Narayan, J. & Saltmarsh, M. J.
Object Type:
Article
System:
The UNT Digital Library
100 mg $sup 251$Cf activation analysis facility at the Savannah River Laboratory
The $sup 252$Cf Activation Analysis Facility at the Savannah River Laboratory (SRL) is used routinely for multielement analyses of a wide variety of solid and liquid samples (e.g., metal alloys, fly ash and other airborne particles, rocks, and aqueous and nonaqueous solutions). An automated absolute activation analysis technique, developed to use neutron transport codes to calculate multienergy group neutron spectra and fluxes, converts counting data directly into elemental concentrations expressed in parts per million. The facility contains four sources of $sup 252$Cf totaling slightly over 100 mg. A pneumatic ''rabbit'' system permits automatic irradiation/decay/counting regimes to be performed unattended on up to 100 samples. Detection sensitivities of less than or equal to 400 ppb natural uranium and less than or equal to 0.5 nCi/g for $sup 239$Pu are observed. Detection limits for over 65 elements have been determined. Over 40 elements are detectable at the one part per million level or less. Overall accuracies of +- 10 percent are observed for most elements. (auth)
Date:
January 1, 1975
Creator:
MacMurdo, K. W. & Bowman, W. W.
Object Type:
Article
System:
The UNT Digital Library
120 kA pulsed dc power system with computerized thyristor triggering
A pulsed dc power system provides 120 kA excitation current for the ORMAK toroidal field coils. A drive potential of 1000 volts brings the coils up to full current in about 0.5 seconds. Constant current is maintained for 0.25 seconds, then approximately 20 x 10$sup 6$ joules of stored energy is dumped in a free-wheeling diode and resistance network. The power system contains 8 each, 30 kA, 500 V thyristor controlled dc power modules in a series/parallel combination. A control computer generates thyristor trigger pulses in a programmed sequence as required for the desired duty cycle. A feedback network including current sensing and computer software permits trigger timing adjustments as necessary for constant current operation. (auth)
Date:
January 1, 1975
Creator:
Mosko, S. W.; Bates, D. D.; Bigelow, R. R.; Cottongim, E. K.; Pipes, E. W. & Sueker, K.
Object Type:
Article
System:
The UNT Digital Library
200 kW, 800 MHz transmitter system for lower hybrid heating
This paper describes a new rf heating system which has just been completed and is now operational on the ATC machine. The system utilizes four UHF TV klystrons to generate at least 200 kW of power at a frequency of 800 MHz. Pulse widths can be varied from 20 $mu$sec up to 20 msec. A radar type floating deck modulator along with photo-optical transmitting and receiving devices have been incorporated into the system to provide the pulse fidelity and versatility which characterizes this equipment. Modular construction was emphasized in the design, when possible, to reduce maintenance and down time in the advent of component falilure. Hybrid combining techniques are utilized in order to provide two 100 kW feeds into the machine. (auth)
Date:
January 1, 1975
Creator:
Deitz, A.
Object Type:
Article
System:
The UNT Digital Library
A 218 neutron group master cross section library for criticality safety studies
The AMPX system was used to generate a P$sub 3$ 218 neutron group master cross-section library from ENDF/B-IV data for the fuel, structural, and neutron- absorbing materials tabulated. The library is the data base for the generation of broad-group cross sections for shipping cask calculations and other criticality safety analyses using codes such as KENO and ANISN. Selection of the fine-group energy structure for the 3-eV to 20-MeV energy range included consideration of the resonance structure of prominent nuclei, the thresholds of important reactions, and the fission spectra. For 10$sup -5$ less than or equal to E/sub n/ less than 3 eV, 78 closely spaced thermal groups were chosen to examine the effects of low-energy resonances and thermal-neutron upscatter. Distribution of the 218 groups within the Hansen-Roach 16-group boundaries is shown. Adequacy of the group structure and validity of selected data sets from the library were tested by P$sub 3$S$sub 8$ XSDRNPM calculations of k-eff for two benchmark critical experiments; first, the 4.9 percent-enriched UO$sub 2$F$sub 2$- H$sub 2$O solution critical sphere experiment of Johnson and Cronin was analyzed, and, second, the 93.2 percent-enriched UO$sub 2$F$sub 2$-H$sub 2$O solution critical sphere experiment of Fox was analyzed. (auth)
Date:
January 1, 1975
Creator:
Ford, W. E., III; Westfall, R. M. & Webster, C. C.
Object Type:
Article
System:
The UNT Digital Library
242-S Evaporator-Crystallizer Information Manual
This report is the thorough description of the 242-S Evaporator-Crystallizer Information Manual.
Date:
September 1, 1975
Creator:
Hernerson, R. R.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 4, No. 14, Ed. 1 Thursday, May 1, 1975
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 1, 1975
Creator:
Reid, Jami
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
1964 Project Springfield studies. Research Report 2. [Stratospheric-tropospheric exchange of fallout particles and subsequent rainout of radioactive particles by precipitation systems]
The analysis of the data for a storm on April 4, 1964, showed that in spite of all efforts to obtain a dynamically and internally consistent three-dimensional analysis of conventional wind, pressure, and temperature data, there remain ambiguities of 50 to 100 miles in the horizontal location of the boundaries of the stratospheric air. Missing wind data and temperature errors, though not disastrous in routine meteorological analysis, can seriously affect the potential vorticity computations for several isentropic surfaces. Trajectory analyses introduce additional errors. Aircraft measurements of fallout beta activity, when carefully planned and made at map time, can improve the precision to 1000 feet in the vertical, and to a few miles in the horizontal. This precision is necessary for conclusive proof of the capture of radioactive particles from the stratosphere by precipitating clouds. However, for large-scale global studies of fallout transport, errors of 50 to 100 miles in the location of air parcels with certain potential. During the 1963 study, it was found that the flow patterns at different levels were seriously affected by coding and plotting errors in the radiosonde data which often escape attention in conventional upper air analyses.
Date:
October 1, 1975
Creator:
Feteris, P. J.
Object Type:
Report
System:
The UNT Digital Library
1974 annual report
Separate abstracts were prepared for 12 sections of this report. Six items have been announced in Nuclear Science Abstracts and all twelve items have been announced in ERDA Research Abstracts. (CH)
Date:
September 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1974 annual summary report
None
Date:
July 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1974 Environmental Monitoring Report
None
Date:
April 1, 1975
Creator:
Hull, A. P. & Ash, J. A.
Object Type:
Report
System:
The UNT Digital Library
239Pu Contamination in Snakes Inhabiting the Rocky Flats Plant Site
For approximately four years studies have been under way at the Rocky Flats plant to determine contamination patterns and concentrations of Pu in the biota. Contamination of the Rocky Flats environs has resulted from at least three incidents, a September 1957 fire, a May 1969 fire, and leaking barrels containing plutonium-laden cutting oil. The latter incident was considered by far the major source of the plutonium contamination. Results are reported from a study conducted to determine whether snake tissues of the area contained detectable amounts of /sup 239/Pu and, if so, at what concentrations. Eastern yellow-bellied racers (Coluber constrictor flaviventris, bullsnakes (Pituophis melanoleucus sayi, and prairie rattlesnakes (Crotalus viridis viridis, were collected for /sup 239/Pu bioassay of lung, liver, and bone tissues. Snakes were captured using drift fences terminating in funnel traps and by opportunistic sampling. Results led to the conclusion that snakes are not an important organism in the redistribution of /sup 239/Pu. (CH)
Date:
January 1, 1975
Creator:
Geiger, R. A. & Winsor, T. F.
Object Type:
Report
System:
The UNT Digital Library
249cm$sup 3$ Ge(Li) detector for medical imaging
The feasibility of constructing a radioisotope scanner using a Ge(Li) detector with adequate efficiency for clinical use is discussed. (WHK)
Date:
January 1, 1975
Creator:
Kirby, J. A.; Phelps, P. L.; Sawyer, D.; Armantrout, G. A.; Shipley, W. W.; Atkins, F. B. et al.
Object Type:
Article
System:
The UNT Digital Library
2XIIB status
The 2XIIB CTR facility at LLL is described with emphasis on the engineering aspects of recent modifications. The current version of the 2X series of magnetic confinement experiments has been operating since the fall of 1974. The 2XIIB relies on pulsed-mirror coils to trap axially-injected low- energy ions. Subsequent heating of the ions is accomplished by energizing additional mirror coils to compress the plasma. Experiments prior to 2XIIB demonstrated plasma trapping and confinement in the pulsed mode. The new feature of 2XIIB is intense beams of electrically neutral atoms that heat the target plasma and sustain its classical losses. The principal goal of on-going experiments is to demonstrate scaling of the eta tau product with mean ion energy via neutral beam injection. This paper is an overview of the engineering developments of the past two years and an introduction to more detailed reports presented at this symposium. (auth)
Date:
November 1, 1975
Creator:
Bulmer, R. H.; Calderon, M. O.; Hibbs, S. M. & Kozman, T. A.
Object Type:
Article
System:
The UNT Digital Library
2XIIB vacuum vessel: a unique design
The 2XIIB mirror confinement experiment makes unique demands on its vacuum system. The confinement coil set encloses a cavity whose surface is comprised of both simple and compound curves. Within this cavity and at the core of the machine is the operating vacuum which is on the order of 10$sup -9$ Torr. The vacuum container fits inside the cavity, presenting an inside surface suitable for titanium getter pumping and a means of removing the heat load imposed by incandescent sublimator wires. In addition, the cavity is constructed of nonmagnetic and nonconducting materials (nonmetals) to avoid distortion of the pulsed confinement field. It is also isolated from mechanical shocks induced in the machine's main structure when the coils are pulsed. This paper describes the design, construction, and operation of the 2XIIB high-vacuum vessel that has been performing successfully since early 1974. (auth)
Date:
November 1, 1975
Creator:
Hibbs, S. M. & Calderon, M. O.
Object Type:
Article
System:
The UNT Digital Library
Absolute measurement of the critical scattering cross section in cobalt
Small-angle neutron scattering techniques have been used to study the angular distribution of the critical scattering from cobalt above T/sub c/. These measurements have been put on an absolute scale by calibrating the critical scattering directly against the nuclear incoherent scattering from cobalt. In this way the interaction range r$sub 1$, which appears in the classical and modified Ornstein--Zernike expressions for the asymptotic form of the spin pair correlation function and is related to the strength of the spin correlations, has been determined. We obtain r$sub 1$/a = 0.46 +- 0.03 for the ratio of the interaction range to the nearest-neighbor distance in cobalt. This result is in good agreement with theoretical predictions. Lack of agreement among previous determinations of the ratio r$sub 1$/a made in iron failed to provide a definitive comparison with theory. (auth)
Date:
January 1, 1975
Creator:
Glinka, C. J.; Minkiewicz, V. J. & Passell, L.
Object Type:
Article
System:
The UNT Digital Library
Absorption and luminescence of glasses during electron irradiation
None
Date:
January 1, 1975
Creator:
Swyler, K. J.; Hardy, W. H., II & Levy, P. W.
Object Type:
Article
System:
The UNT Digital Library
Abstract algebra for physicists
None
Date:
June 1, 1975
Creator:
Zeman, J.
Object Type:
Report
System:
The UNT Digital Library
Abstracts of contributed papers. Sixth international conference on high- energy physics and nuclear structure, Santa Fe and Los Alamos, NM, June 9--14, 1975
Abstracts of contributed papers are assembled under the following headings (number denotes the number of abstracts in the section): pi p and pi d interactions (10); $pi$ nucleus theory (33); intermediate isobar calculations (8); $pi$-nucleus interactions (25); stopping muons (44); exotic atoms and condensed nuclear states (28); nucleus-nucleus interactions (31); nuclear structure and hypernuclei (7); nucleon-nucleon interactions (24); e- and $gamma$- nucleus interactions (29); weak interactions (17); high energy collisions (13); heavy ions (22); instrumentation (8). (SDF)
Date:
August 1, 1975
Creator:
Mischke, R.; Hargrove, C. & Hoffman, C.
Object Type:
Article
System:
The UNT Digital Library
Accelerated iteration schemes for transonic flow calculations using fast Poisson solvers
Results obtained by using a fast Poisson solver to accelerate the rate of convergence of the iterative scheme are described. A fast iterative method for transonic flow calculations is formulated first, and then application is made to the transonic potential flow equation in a mapped domain. It is concluded that the use of a fast elliptic solver in combination with relaxation is an effective way to accelerate the convergence of transonic flow calculations, particularly when a marching scheme can be used to treat the supersonic zone in the relaxation process. 3 figures (RWR)
Date:
March 1, 1975
Creator:
Jameson, A
Object Type:
Report
System:
The UNT Digital Library
Acceleration techniques for response matrix methods
Application of the power iteration method to the multigroup response matrix equations reduces them to a series of one-group problems. Applying acceleration techniques to each of these monoenergetic problems results in substantial reductions in computational effort. The use of point over-relaxation methods in the solution of these equations is described. Over-relaxation is also applied to the outer-iteration eigenvalue and source estimations with considerable success. 10 references. (auth)
Date:
January 1, 1975
Creator:
Sicilian, J. M. & Pryor, R. J.
Object Type:
Article
System:
The UNT Digital Library
Accelerators for heavy ions
None
Date:
January 1, 1975
Creator:
Martin, J. A.
Object Type:
Article
System:
The UNT Digital Library
Acceptance test specifications for test number eleven: sodium system filling, heatup, pressurization, and drain. [LMFBR]
This document provides the general instructions for performing acceptance test number eleven as indicated in the Acceptance Test Index (TI-022-130-003). Also indicated are the plant conditions and special equipment required to conduct the test. The acceptance criteria for each portion of the test are specified.
Date:
May 1, 1975
Creator:
Bell, C.R.
Object Type:
Report
System:
The UNT Digital Library
Accurate measurement of noise parameters in ultra-low noise opto-feedback spectrometer systems
None
Date:
May 1, 1975
Creator:
Llacer, J.
Object Type:
Article
System:
The UNT Digital Library