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in subjects: "Beryllium"

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Di-leptons at the Bevalac

Recent results on the production of di-leptons measured by the Di-Lepton-Spectrometer (DLS) collaboration are discussed. Results are reported from observations made on p /plus/ Be collisions with proton beams from 1.0 to 4.9 GeV and on Ca collisions with calcium beams of 1.0 to 2.0 GeV/A. The shape of the distributions are similar to that at higher energies. The low mass cross section appears to be explained by ..pi..-..pi.. annihilation, but detailed calculations are needed to substantiate tha… more

Date: March 1, 1988

Creator: Matis, H.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Cause of pitting in beryllium

Light microscopy, bare-film radiography, secondary ion mass spectroscopy, electron microprobe and physical testing were used to examine beryllium specimens exhibiting a stratified, pitted, pattern after chemical milling. The objective was to find the cause of this pattern. Specimens were found to have voids in excess of density specification allowances. These voids are attributed, at least in part, to the sublimation of beryllium fluoride during the vacuum hot pressing operation. The origin of … more

Date: April 16, 1982

Creator: Kershaw, R. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Cross Sections for X-Ray Photoelectron-Induced Desorption of Hydrogen Ions From Metal Surfaces

We have measured the cross sections for x-ray photoelectron-induced desorption of hydrogen ions from beryllium, carbon, aluminum, tantalum, and gold surfaces. This report describes the results of the cross-section measurements, and discusses a time-of-flight technique that allows the determination of ionic-desorption cross sections as small as 10/sup -25/ cm/sup 2/ per photoelectron. 19 refs., 7 figs.

Date: September 20, 1985

Creator: Kinney, J. H.; Siekhaus, W. J. & Anderson, R. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Stream sediment detailed geochemical survey for Marysvale, Utah

Results of the Marysvale detailed geochemical survey are reported. Field and laboratory data are presented for 397 stream sediment samples and 160 radiometric readings. Statistical and areal distributions of uranium and possible uranium-related variables are displayed. A generalized geologic map of the area is provided, and pertinent geologic factors which may be of significance in evaluating the potential for uranium mineralization are briefly discussed. Stream sediments containing significant… more

Date: July 31, 1980

Creator: Butz, T. R.; Vreeland, J. L.; Bard, C. S.; Helgerson, R. N.; Grimes, J. G. & Pritz, P. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Radioactivities of Long Duration Exposure Facility (LDEF) materials: Baggage and bonanzas

Radioactivities in materials onboard the returned Long Duration Exposure Facility (LDEF) satellite have been studied by a variety of techniques. Among the most powerful is low-background Ge-semiconductor detector gamma-ray spectrometry, illustrated here by results obtained at the Lawrence Berkeley Laboratory's (LBL) Low Bakground Facilities, in a multi-laboratory collaboration coordinated by Dr. Thomas Parnell's team at the Marshall Spacecraft Center, Huntsville, Alabama.

Date: August 1, 1991

Creator: Smith, A. R. & Hurley, D. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electron-beam fusion welding of beryllium

Ingot-sheet beryllium (Be) having three different chemistries and three different thicknesses was fusion-welded by the electron-beam process. Several different preheats were used to obtain 100% penetration and crack-free welds. Cracking susceptability was found to be related to aluminum (Al) content; the higher Al-content material was most susceptable. However, adequate preheat allowed full penetration and crack-free welds to be made in all materials tested. The effect of a post-weld heat treat… more

Date: January 1, 1978

Creator: Campbell, R. P.; Dixon, R. D. & Liby, A. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analysis of oxygen on and in beryllium using 2 MeV helium ions

Analysis of oxygen on beryllium can be routinely performed using helium-ion backscattering (RBS). However, determination of the bulk oxygen concentration by this technique is limited to about 350 atomic parts per million (appM). We have performed simultaneous RBS and particle-induced x-ray emission (PIXE) measurements to improve the detection limit for bulk oxygen. The RBS measurements allowed determination of the surface oxygen before and after in-situ sputter cleaning by argon ions in an ultr… more

Date: October 2, 1986

Creator: Musket, R.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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RADIOISOTOPES AND RADIATION APPLICATIONS. Quarterly Progress Report No. 12

Continued research is reported in the areas of intrinsic radioactive tracers for industrial process control and the effects of structural factors on radioinduced graft polymerization. The use of Be-- Po neutron sources for production of short-lived isotopes is being investigated. Data are included on the effects of target volume, high-Z scattering media, target-isotope concentration, and macroscopic cross-section on speciflc and total activation produced with a 10-curie source. Research on graf… more

Date: April 18, 1962

Creator: Sunderman, D.N. ed.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High performance, suppressed-fission ICF hybrid

The neutronics aspects of an ICF hybrid concept are discussed. The breeding blanket consists of a beryllium neutron multiplier, metallic thorium fertile fuel and a liquid-lithium coolant. The fertile fuel fraction is 30 vol%, which is much higher than previous one-zone, suppressed-fission hybrid concepts. Fission in the bred /sup 233/U is suppressed by competition from tritium breeding reactions in /sup 6/Li. The total breeding ratio, T + F, is 2.05, and the total neutron energy deposited is 41… more

Date: December 1, 1983

Creator: Meier, W. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Considerations for the use of synchrotron radiation sources to measure sub-keV x-ray photoabsorption cross sections in transmission

Sub-keV x-ray photoabsorption cross section measurements in transmission have been made using synchrotron radiation beam lines on the VUV storage ring at the National Synchrotron Light Source (NSLS) and on the SPEAR storage ring at Stanford. The experimental considerations associated with making absolute measurements are reviewed, along with techniques for resolving difficulties. Suggestions for future measurements are included.

Date: February 1, 1988

Creator: Tirsell, K.G. & Del Grande, N.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Beryllium usage in fusion blankets and beryllium data needs. [None]

Increasing numbers of designers are choosing beryllium for fusion reactor blankets because it, among all nonfissile materials, produces the highest number (2.5 neutron in an infinite media) of neutrons per 14-MeV incident neutron. In amounts of about 20 cm of equivalent solid density, it can be used to produce fissile material, to breed all the tritium consumed in ITER from outboard blankets only, and in designs to produce Co-60. The problem is that predictions of neutron multiplication in bery… more

Date: April 6, 1988

Creator: Moir, Ralph W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Trace elements in the terrestrial environment of a coal-fired powerhouse

A coal-fired powerhouse at the Savannah River Plant, Aiken, South Carolina operated for more than 20 years without electrostatic precipitators and consumed about 360,000,000 kilograms of coal per year. Twenty-nine trace elements were measured in fly ash, and in samples of soil, vegetation, and ground water collected along a 29-km traverse centered on the powerhouse. There were statistically significant effects of the stack releases upon the concentration of Ba, Be, Cu, Hg, Mn, Se, and Sr in soi… more

Date: September 1, 1977

Creator: Horton, J. H.; Dorsett, R. S. & Cooper, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Data report: Illinois, Indiana, Kentucky, Tennessee, and Ohio. National Uranium Resource Evaluation Program. Hydrogeochemical and stream sediment reconnaissance

This report presents the results of ground water, stream water, and stream sediment reconnaissance in Illinois, Indiana, Kentucky, Tennessee, and Ohio. The following sample types were collected in each state: Illinois - 716 stream sediment, 1046 ground water, 337 stream water; Indiana - 126 stream sediment, 443 ground water, 111 stream water; Kentucky - 4901 stream sediment, 6408 ground water, 3966 stream water; Tennessee - 3309 stream sediment, 3574 ground water, 1584 stream water; Ohio - 1214… more

Date: February 1, 1982

Creator: Sargent, K. A.; Cook, J. R. & Fay, W. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Advances in materials science, Metals and Ceramics Division. Triannual progress report, October 1979-January 1980

Progress is summarized concerning magnetic fusion energy materials, laser fusion energy, aluminium-air battery and vehicle, geothermal research, oil-shale research, nuclear waste management, office of basic energy sciences research, and materials research notes. (FS)

Date: March 31, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Effect of strain-gage surface preparation techniques on beryllium

Beryllium is a metal sensitive to machining damage, causing a loss in mechanical properties. Since some mechanical abrading is often used in surface preparation for mounting strain gages, it is desirable to know whether the abrading produces flaws. Metallographic study of beryllium subjected to four different surface preparation methods was carried out. It was determined that the gentle abrading necessary for affixing strain gages produced a negligible density and depth of flaws and did not low… more

Date: September 19, 1977

Creator: Hanafee, J. E.; Hughes, Jr., J. W. & McInturff, S. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Construction of the CDF silicon vertex detector

Technical details and methods used in constructing the CDF silicon vertex detector are presented. This description includes a discussion of the foam-carbon fiber composite structure used to silicon microstrip detectors and the procedure for achievement of 5 {mu}m detector alignment. The construction of the beryllium barrel structure, which houses the detector assemblies, is also described. In addition, the 10 {mu}m placement accuracy of the detectors in the barrel structure is discussed and the… more

Date: April 1, 1992

Creator: Skarha, J.; Barnett, B.; Boswell, C.; Snider, F.; Spies, A.; Tseng, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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/sup 3/He functions in tokamak-pumped laser systems

/sup 3/He placed in an annular cell around a tokamak fusion generator can convert moderated fusion neutrons to energetic ions by the /sup 3/He(n,p)T reaction, and thereby excite gaseous lasants mixed with the /sup 3/He while simultaneously breeding tritium. The total /sup 3/He inventory is about 4 kg for large tokamak devices. Special configurations of toroidal-field magnets, neutron moderators and beryllium reflectors are required to permit nearly uniform neutron current into the laser cell wi… more

Date: October 1, 1986

Creator: Jassby, D. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Uranium hydrogeochemical and stream sediment reconnaissance data release for the Elk City NTMS Quadrangle, Idaho/Montana, including concentrations of forty-five additional elements

Totals of 1580 water and 1720 sediment samples were collected from 1754 locations in the quadrangle. Elemental concentration, field measurement, weather, geologic, and geographic data for each sample location are listed for waters in Appendix I-A and for sediments in Appendix I-B. Uranium/thorium ratios for sediment samples are also included in Appendix I-B. All elemental analyses were performed at the LASL. Water samples were initially analyzed for uranium by fluorometry. All water samples con… more

Date: July 1, 1980

Creator: Broxton, D. E. & Beyth, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Summary of beryllium specifications

This report summarizes and compares the main beryllium properties included in producer, Department of Energy (formerly ERDA) facility, and government specifications. These data are tabulated in a sequence established primarily by increasing purity and secondarily by increasing tensile properties. Comments on formability and weldability are also included.

Date: February 17, 1978

Creator: Corle, R. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Number of detectable kaon decays at LAMPF II

The maximum number of kaon decays detectable at LAMPF II is estimated for both in-flight and stopping decays. Under reasonable assumptions, the momentum of the kaon beam that optimizes the decay yield occurs at about 6 GeV/c and 600 MeV/c for in-flight and stopping decays, respectively. K/sup +/ decay yields are fo the order of 7 x 10/sup 7/ per 10/sup 14/ interacting with K/sup -/ yields being typically 5 times less. By measuring decays from such beams, a statistical limit of 10/sup -15/ on a … more

Date: April 1, 1982

Creator: Sanford, T.W.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Energy calibration scheme for acoustic emission

The calibration technique described is an attempt to determine the actual energy release from the events causing emission bursts in beryllium and to quantitatively evaluate the effects of specimen geometry on the apparent energy per burst. (GHT)

Date: September 13, 1977

Creator: Adams, R. O. & Heiple, C. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Equation of state of beryllium

A new, wide-range equation of state (EOS) has been constructed for Be. The composite theoretical model incorporates ionization equilibrium and condensed-matter and multiphase physics. It also satisfies all thermodynamic equilibrium constraints. The theoretical EOS has been compared with all available high-pressure and high-temperature Be data, and satisfactory agreement is generally achieved. The most interesting feature is the theoretical prediction of melting at just below 220 GPa (2 Mb), ind… more

Date: September 15, 1977

Creator: Graboske, H. & Wong, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Safety assessment document for the Dynamic Test Complex B854

A safety assessment was performed to determine if potential accidents at the 854 Complex at Site 300 could present undue hazards to the general public, personnel at Site 300, or have an adverse effect on the environment. The credible accidents that might have an effect on these facilities or have off-site consequences were considered. These were earthquake, extreme wind (including missiles), lightning, flood, criticality, high explosive (HE) detonation that disperses uranium and beryllium, spon… more

Date: December 11, 1981

Creator: Odell, B.N. & Pfeifer, H.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Acoustic emission from beryllium

The acoustic emission from both powder and ingot source beryllium has been measured as a function of strain and prior heat treatment. Most measurements were made during tensile deformation, but a limited number of compression tests have also been performed. The acoustic emission observed was of the burst type, with little or no contribution from continuous type emission. The emission was characterized by the variation of burst rate and average energy per burst as a function of strain. The tensi… more

Date: June 9, 1976

Creator: Heiple, C. R. & Adams, R. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department