192 Matching Results

Search Results

Advanced search parameters have been applied.

The role of actinide burning and the Integral Fast Reactor in the future of nuclear power

Description: A preliminary assessment is made of the potential role of actinide burning and the Integral Fast Reactor (IFR) in the future of nuclear power. The development of a usable actinide burning strategy could be an important factor in the acceptance and implementation of a next generation of nuclear power. First, the need for nuclear generating capacity is established through the analysis of energy and electricity demand forecasting models which cover the spectrum of bias from anti-nuclear to pro-nuclear. The analyses take into account the issues of global warming and the potential for technological advances in energy efficiency. We conclude, as do many others, that there will almost certainly be a need for substantial nuclear power capacity in the 2000--2030 time frame. We point out also that any reprocessing scheme will open up proliferation-related questions which can only be assessed in very specific contexts. The focus of this report is on the fuel cycle impacts of actinide burning. Scenarios are developed for the deployment of future nuclear generating capacity which exploit the advantages of actinide partitioning and actinide burning. Three alternative reactor designs are utilized in these future scenarios: The Light Water Reactor (LWR); the Modular Gas-Cooled Reactor (MGR); and the Integral Fast Reactor (FR). Each of these alternative reactor designs is described in some detail, with specific emphasis on their spent fuel streams and the back-end of the nuclear fuel cycle. Four separation and partitioning processes are utilized in building the future nuclear power scenarios: Thermal reactor spent fuel preprocessing to reduce the ceramic oxide spent fuel to metallic form, the conventional PUREX process, the TRUEX process, and pyrometallurgical reprocessing.
Date: December 1, 1990
Creator: Hollaway, W. R.; Lidsky, L. M. & Miller, M. M.
Partner: UNT Libraries Government Documents Department

Sampling errors associated with soil composites used to estimate mean Ra-226 concentrations at an UMTRA remedial-action site

Description: The decision whether to take additional remedial action (removal of soil) from regions contaminated by uranium mill tailings involves collecting 20 plugs of soil from each 10-m by 10-m plot in the region and analyzing a 500-g portion of the mixed soil for /sup 226/Ra. A soil sampling study was conducted in the windblown mill-tailings flood plain area at Shiprock, New Mexico, to evaluate whether reducing the number of soil plugs to 9 would have any appreciable impact on remedial-action decisions. The results of the Shiprock study are described and used in this paper to develop a simple model of the standard deviation of /sup 226/Ra measurements on composite samples formed from 21 or fewer plugs. This model is used to predict as a function of the number of soil plugs per composite, the percent accuracy with which the mean /sup 226/Ra concentration in surface soil can be estimated, and the probability of making incorrect remedial action decisions on the basis of statistical tests. 8 refs., 15 figs., 9 tabs.
Date: July 1, 1987
Creator: Gilbert, R.O.; Baker, K.R.; Nelson, R.A.; Miller, R.H. & Miller, M.L.
Partner: UNT Libraries Government Documents Department

Area 5 Site Characterization Project: Report of hydraulic property analysis through August 1993

Description: The Area 5 Site Characterization Project is designed to determine the suitability of the Radioactive Waste Management Site (RWMS) for disposal of low-level waste (LLW), mixed waste (MW) and transuranic waste (TRU). The Desert Research Institute (DRI) has supported the Area 5 Site Characterization Project for the US Department of Energy, Nevada Operations Office (DOE/NV), Environmental Restoration and Waste Management Division (ERWM), Waste Operations Branch (WOB). The purpose of DRI`s Area 5 Site Characterization project is to characterize important properties of the upper vadose zone which influence infiltration and redistribution of water and transport of solutes as well as to characterize the water quality and hydrologic conditions of the uppermost aquifer. This report describes methods and presents a summary of all data and results from laboratory physical and chemical testing from Pilot Wells and Science Trench borehole samples through August 1993. DRI laboratories performed soil water content, soil water potential, soil bulk density, soil water extract isotope analyses and soil water chemistry analyses.
Date: December 1, 1993
Creator: Estrella, R.; Tyler, S.; Chapman, J. & Miller, M.
Partner: UNT Libraries Government Documents Department

Electrostatic reduction of particulates for laser resistant hafnia coatings

Description: The authors have reduced by 50% particulate defect density of hafnia coatings deposited onto silicon substrates through the use of electric fields, physical barriers and deposition rate. In an effort to reduce the number of hafnia (HfO{sub 2}) particulates deposited onto silicon wafers, parallel plate electrodes were placed on either side of the evaporant plume. The particulate level was determined as the deposition rate was varied from 0.75 {angstrom}/sec to 12 {angstrom}/sec. Then, parallel plate electrodes were placed on either side of the plume as a way of electrostatically deflecting hafnia particulates away from the substrates. Later a single plate electrode was used in conjunction with a physical barrier placed over the hearth. The results of the study indicate that minimal defects occur when a parallel plate electric field is applied in conjunction with a fast deposition rate. Using a screen as a physical barrier, and/or a single electrode had little or no effect. This data may be useful in the manufacture of multilayer optical coatings with high laser damage thresholds.
Date: December 1, 1993
Creator: Miller, M. D.; Chow, R. & Loomis, G. E.
Partner: UNT Libraries Government Documents Department

Atom probe field ion microscopy and related topics: A bibliography 1992

Description: This bibliography contains citations of books, conference proceedings, journals, and patents published in 1992 on the following types of microscopy: atom probe field ion microscopy (108 items); field emission microscopy (101 items); and field ion microscopy (48 items). An addendum of 34 items missed in previous bibliographies is included.
Date: December 1, 1993
Creator: Russell, K. F.; Godfrey, R. D. & Miller, M. K.
Partner: UNT Libraries Government Documents Department

Considerations for How to Rate CPV

Description: The concentrator photovoltaic (CPV) industry is introducing multiple products into the marketplace, but, as yet, the; community has not embraced a unified method for assessing a nameplate rating. The choices of whether to use 850,; 900, or 1000 W/m2 for the direct-normal irradiance and whether to link the rating to ambient or cell temperature will; affect how CPV modules are rated and compared with other technologies. This paper explores the qualitative and; quantitative ramifications of these choices using data from two multi-junction CPV modules and two flat-plate; modules.
Date: February 1, 2011
Creator: Kurtz, S.; Miller, M.; Marion, B.; Emery, K.; McConnell, R.; Surendran, S. et al.
Partner: UNT Libraries Government Documents Department

Smart Libraries: Best SQE Practices for Libraries with an Emphasis on Scientific Computing

Description: As scientific computing applications grow in complexity, more and more functionality is being packaged in independently developed libraries. Worse, as the computing environments in which these applications run grow in complexity, it gets easier to make mistakes in building, installing and using libraries as well as the applications that depend on them. Unfortunately, SQA standards so far developed focus primarily on applications, not libraries. We show that SQA standards for libraries differ from applications in many respects. We introduce and describe a variety of practices aimed at minimizing the likelihood of making mistakes in using libraries and at maximizing users' ability to diagnose and correct them when they occur. We introduce the term Smart Library to refer to a library that is developed with these basic principles in mind. We draw upon specific examples from existing products we believe incorporate smart features: MPI, a parallel message passing library, and HDF5 and SAF, both of which are parallel I/O libraries supporting scientific computing applications. We conclude with a narrative of some real-world experiences in using smart libraries with Ale3d, VisIt and SAF.
Date: December 15, 2004
Creator: Miller, M C; Reus, J F; Matzke, R P; Koziol, Q A & Cheng, A P
Partner: UNT Libraries Government Documents Department

Micropixe as a tool to search for uranium-bearing particles in lung tissues

Description: A proton microbeam is proposed as a tool to search for uranium-bearing particles in lung tissues. Preliminary experiments have been undertaken by irradiating with protons lung tissues of dogs previously exposed to uranium ore. 7 references.
Date: January 1, 1982
Creator: Paschoa, A.S.; Wrenn, S.C.; Miller, M.E.; Jones, K.W.; Cholewa, M. & Hanson, A.L.
Partner: UNT Libraries Government Documents Department

Atom Probe Field Ion Microscopy of Zr-Doped Polysynthetically Twinned Titanium Aluminide

Description: Interracial segregation and partitioning in a polysynthetically twinned Ti-48.4 at.% Al-0.6% Zr alloy were investigated by atom probe field ion microscopy and atom probe tomography. The compositions of the {gamma} and {alpha}{sub 2} phases were determined to be Ti-47.5% Al-O.71% Zr-0.06% O and Ti-31.6% Al-0.68% Zr-2.4% O, respectively. These results indicate a high concentration of zirconium in both matrix phases, confirming a strength increase through solid-solution strengthening, but no significant zirconium partitioning to either phase. Although zirconium additions produced a refined lamellar microstructure in this material, compositional analysis of {gamma}/{gamma} and {gamma}/{alpha}{sub 2} interfaces showed no evidence of significant zirconium segregation. This suggests that zirconium additions may produce a refined lamellar microstructure, but may not be effective at providing resistance to growth and coarsening.
Date: February 28, 1999
Creator: Inui, H.; Larson, D.J.; Miller, M.K. & Yamaguchi, M.
Partner: UNT Libraries Government Documents Department

Atom probe field-ion microscopy investigation of nickel base superalloy welds

Description: Microstructure development and elemental partitioning between {gamma} and {gamma}{prime} were measured in PWA-1480 electron beam welds and CMSX-4 pulsed-laser welds. In PWA-1480 EB welds, eutectic {gamma}{prime} phases were observed along the dendritic boundaries. The elemental partitioning between {gamma} and {gamma}{prime} was found to be similar to that in PWA-1480 base metal. In CMSX-4 pulsed laser welds, negligible eutectic {gamma}{prime} was observed. In addition, fine and irregularly shaped {gamma}{prime} precipitates were observed. The elemental partitioning between {gamma} and {gamma}{prime} was found to be different from that measured in the base metal. Large concentration gradients were observed in the {gamma} phase. The {gamma}{prime} precipitation kinetics in CM247DS alloy was measured using dilatometry and showed differences with different cooling rates. The microstructural investigations showed that at large undercoolings the number density of {gamma}{prime} precipitates increased and led to a finer size. This supports the microstructure development observations in PWA-1480 and CMSX-4 welds. Thermodynamic and kinetic calculations for the Ni-Al-Cr alloy system showed that as the cooling rate increases, the {gamma}{prime} growth leads to large concentration gradients in the {gamma} phase. The calculations agree with the atom probe results from PWA-1480 and CMSX-4 welds.
Date: November 1, 1998
Creator: Babu, S.S.; David, S.A.; Vitek, J.M. & Miller, M.K.
Partner: UNT Libraries Government Documents Department

Partitioning behavior of alloying elements in PWA 1484

Description: Nominal composition of single-crystal PWA 1484 material is Ni-10.5 at.% Co, 6% Cr, 1.3% Mo, 2.0% W, 12.9% Al, 3.0% Ta, 0.04% Hf, and 1.0% Re. It was examined after standard heat treatment of 4 h at 1304 C, 4 h at 1079 C, and 24 h at 704 C. An atom probe field ion microscope was used. Co, Cr, Mo, W and Re partition to the {gamma} phase and Ni, Al, Ta, and Hf partition to the {gamma}` phase. Atom-by-atom data chains and statistical analysis did not show any evidence of Re clusters in the {gamma} matrix.
Date: August 1, 1996
Creator: Miller, M.K.; Lin, L.S.; Cetel, A.D.; Harada, H. & Murakami, H.
Partner: UNT Libraries Government Documents Department

Characterization of phosphorus segregation in neutron-irradiated pressure vessel steels by atom probe field ion microscopy

Description: An atom probe field ion microscopy characterization of A533B and Russian VVER 440 and 1000 pressure vessel steels has been performed to determine the phosphorus coverage of grain and lath boundaries. Field ion micrographs of grain and lath boundaries have revealed that they are decorated with a semi-continuous film of discrete brightly-imaging precipitates that were identified as molybdenum carbonitride precipitates. In addition, extremely high phosphorus levels were measured at the boundaries. The phosphorus segregation was found to be confined to an extremely narrow region indicative of monolayer-type segregation. The phosphorus coverages determined from the atom probe results of the unirradiated materials were in excellent agreement with predictions based on McLean`s equilibrium model of grain boundary segregation. The boundary phosphorus coverage of a neutron-irradiated weld material was significantly higher than that observed in the unirradiated material.
Date: April 1995
Creator: Miller, M. K.; Jayaram, R. & Russell, K. F.
Partner: UNT Libraries Government Documents Department

ROAMing terrain (Real-time Optimally Adapting Meshes)

Description: Terrain visualization is a difficult problem for applications requiring accurate images of large datasets at high frame rates, such as flight simulation and ground-based aircraft testing using synthetic sensor stimulation. On current graphics hardware, the problem is to maintain dynamic, view-dependent triangle meshes and texture maps that produce good images at the required frame rate. We present an algorithm for constructing triangle meshes that optimizes flexible view-dependent error metrics, produces guaranteed error bounds, achieves specified triangle counts directly, and uses frame-to-frame coherence to operate at high frame rates for thousands of triangles per frame. Our method, dubbed Real-time Optimally Adapting Meshes (ROAM), uses two priority queues to drive split and merge operations that maintain continuous triangulations built from pre-processed bintree triangles. We introduce two additional performance optimizations: incremental triangle stripping and priority-computation deferral lists. ROAM execution time is proportionate to the number of triangle changes per frame, which is typically a few percent of the output mesh size, hence ROAM performance is insensitive to the resolution and extent of the input terrain. Dynamic terrain and simple vertex morphing are supported.
Date: July 1, 1997
Creator: Duchaineau, M.; Wolinsky, M.; Sigeti, D.E.; Miller, M.C.; Aldrich, C. & Mineev, M.
Partner: UNT Libraries Government Documents Department

Techniques for the determination of local dynamic pressure and angle of attack on a horizontal axis wind turbine

Description: Data from the National Renewable Energy Laboratory`s Combined Experiment has been utilized to develop techniques for indirectly calculating the instantaneous local dynamic pressure and angle of attack on a horizontal axis wind turbine. First, an analytic model based upon inflow geometry relative to the wind turbine was developed for both parameters. Second, dynamic pressure and angle of attack were inferred from the pressure required to normalize the blade stagnation point to C{sub p} = 1.0. Third, rotor blade pressure profiles were compared to those from wind tunnel tests to determine angle of attack. Test results are shown over a variety of typical inflow conditions and are corroborated by measured data. Differences between the calculated and measured values are also discussed.
Date: May 1, 1995
Creator: Shipley, D.E.; Miller, M.S.; Robinson, M.C.; Luttges, M.W. & Simms, D.A.
Partner: UNT Libraries Government Documents Department


Description: The WHOI buoy radiometer intercomparison took place during May and June, 2000 at the WHOI facility. The WHOI IMET, JAMSTEC Triton, and NOAA TAO buoy systems were operated from a beach site and the Brookhaven National Laboratory set up two Portable Radiation Package systems (P01 and P02) alongside the WHOI instrumentation on the roof of the Clark Building, about 300 m away. The BNL instruments were named ''P01'' and ''P02'' and were identical. Buoy instruments were all leveled to {+-}1{degree} to horizontal. The purpose of the project was to compare the buoy systems with precision measurements so that any differences in data collection or processing would be evaluated. BNL was pleased to participate so the PRP system could be evaluated as a calibration tool. The Portable Radiation Package is an integral component of the BNL Shipboard Oceanographic and Atmospheric Radiation (SOAR) system. It is designed to make accurate downwelling radiation measurements, including the three solar irradiance components (direct normal, diffuse and global) at six narrowband channels, aerosol optical depth measurements, and broadband longwave and shortwave irradiance measurements.
Date: December 1, 2000
Creator: Reynolds, R. M.; Bartholomew, M. J.; Miller, M. A.; Smith, S. & Edwards, R.
Partner: UNT Libraries Government Documents Department

The influence of cut off lows on sulfate burdens over the North Atlantic during April, 1987

Description: The authors have presented examples from a modeling study of the development of sulfur burdens over North America, the North Atlantic Ocean and Europe during April, 1987 using observation-derived meteorological data to represent the actual conditions for this period, focusing on the influence of cut-off lows on SO{sub 2} and sulfate column burdens over the North Atlantic Ocean. The analysis demonstrates that these systems can serve either as sources or sinks of sulfate, and that the major factor governing their resulting effect is the position during its formative stages relative to (a) sources of moisture, and (b) sulfur emissions, which regulates the availability of sulfur, cloud liquid water for sulfur oxidation, and the amount of precipitation for sulfate removal produced in the later stages of the life cycle.
Date: January 14, 2001
Creator: Benkovitz, C.M.; Miller, M.A.; Schwartz, S.E. & Kwon, O.U.
Partner: UNT Libraries Government Documents Department

Final report for the high performance commodity interconnects for clustered scientific and engineering computing. Part 1 of 3

Description: For a more detailed look, Netpipe was used to provide the signature graphs of the NDIS services over the Giganet VIA and Packet Engines Gigabit Ethernet hardware. Two Hamachi, a second generation Gigabit Ethernet NIC, were installed in place of the first generation cards. From figure 23 the Gigabit Ethernet (GigE) had significant less bandwidth performance although the theoretical line speed was equal. This means that buffering and device tuning would be necessary for such a gateway to function effectively. To examine the TCP/IP transport stack delay, the Giganet VIA latency and the Netpipe TCP stream tests were used. The following assumptions were made during the analysis: (1) The latency introduced by address translation between VIA and TCP/IP is assumed to be negligible compared to the TCP/IP processing. For a real gateway, the lookup would be done via a hash table and set up a priority. (2) Transferring the data from the VIA to the TCP/IP stack would be done through a DMA copy from the VIA NIC to user memory, followed by a memory copy into the TCP/IP stack. The DMA transfer time is assumed to be negligible compared to the memory copy. The latency of the memory copy is included as part of the TCP/IP processing time. The VIA latency test provides a baseline of the inbound VIA. Both the Giganet and the Netpipe application were using the same hardware setup. The time difference between the two provides an insight as to the latency added by the TCP/IP processing. The graph shows the time difference between polling and non-polling VIA latency versus the TCP/IP processing.
Date: December 1, 1999
Creator: Hu, T.C.; Miller, M.M.; Brenkosh, J.P.; Stans, L. & Tarman, T.D.
Partner: UNT Libraries Government Documents Department

Complementary use of APFIM and TEM for a study of precipitation in a rapidly solidified stainless steel

Description: Strength improvements in stainless steels have been realized by gas atomization. The improvements are most pronounced when elevated concentrations of oxygen and vanadium are present in the metal. However, the precise role of the elements and their location in the microstructure have not been determined. A specimen was prepared by gas atomization and hot extrusion and examined by transmission electron microscopy and field ion microscopy.
Date: April 1, 1997
Creator: Kelly, T.F.; Wisutmethangoon, S.; Larson, D.J. & Miller, M.K.
Partner: UNT Libraries Government Documents Department

Advanced microcharacterization of nickel-base superalloys

Description: The purpose of this project was to characterize the microstructural and microchemical effects of a process revision on HAYNES{reg{underscore}sign} 242{trademark}, a polycrystalline Ni-base superalloy used principally for high temperature applications, such as seal and containment rings in gas turbine engines. The process revision from the current one-step heat treating cycle to a two-step heat treatment would result in savings of energy and ultimately cost to the consumer. However, the proposed process revision could give rise to unforeseen microstructural modifications, such as a change in the size distribution of the ordered particles responsible for alloy strength or the formation of additional phases, which could affect alloy properties and hence performance. Advanced microcharacterization methods that allow images of the microstructure to be acquired at length scales from one micrometer down to the atomic level were used to reveal the effect of the process revision on alloy microstructure. Energy filtered imaging was used to characterize the size distribution and morphology of ordered precipitates and other phases, as well as the partitioning behavior of major elements (Ni, Mo, Cr) among these phases. The compositions of individual ordered particles, including fine-scale compositional variations at precipitate-matrix interfaces, and solute segregation behavior at grain boundaries were characterized at the atomic level by atom probe tomography. The atomic site distributions of selected elements in the ordered precipitates were characterized by atom-location by channeling-enhanced microanalysis (ALCHEMI). The results of these advanced microcharacterization methods were correlated with mechanical testing of similar alloys to address structure-property relationships.
Date: February 1, 2000
Creator: Anderson, I.M.; Miller, M.K.; Pike, L.M. & Klarstrom, D.L.
Partner: UNT Libraries Government Documents Department

Characterization and Modeling of Microstructure Development in Nickel-base Superalloy Welds

Description: Welding is important for economical reuse and reclamation of used and failed nickel-base superalloy blades, respectively [1]. Solidification and solid state decomposition of {gamma} (Face Centered Cubic, FCC) phase into {gamma}{prime} (L1{sub 2}-ordered) phase control the properties of these welds. In previous publications, the microstructure development in electron beam welds of PWA-1480 alloy [2] and laser beam welds of CMSX-4 alloy [3] were presented. These results showed that the weld cracking in these alloys were associated with low melting point eutectic at the dendrite boundaries [1,2]. The eutectic-{gamma}{prime} precipitation was reduced at rapid weld cooling rates and the partitioning between {gamma}-{gamma}{prime} phase was found to be far from equilibrium conditions [3,4]. This observation was related to diffusional growth of {gamma}{prime} precipitate into {gamma} phase. Subsequent to the above work, the precipitation characteristics of {gamma}{prime} phase from {gamma} phase were evaluated during continuous cooling conditions [5]. The results show that the number density of {gamma} precipitates increased with an increase in cooling rate. However, the details of this decomposition and also the fine-scale elemental partitioning characteristics between {gamma}-{gamma}{prime} were not investigated. In this paper, the precipitation characteristics of {gamma}{prime} from {gamma} during continuous cooling conditions were investigated with transmission electron microscopy, and atom probe field ion microscopy. In addition, thermodynamic and kinetic models were used to describe microstructure development in Ni-base superalloy welds.
Date: November 1, 1999
Creator: Babu, S.S.; David, S.A.; Miller, M.K. & Vitek, J.M.
Partner: UNT Libraries Government Documents Department

Bench-scale co-processing. Quarterly report No. 9, March 1, 1990--June 31, 1990

Description: This is the ninth quarterly report. Objective is to extend and optimize UOP`s single-stage slurry-catalyzed co-processing scheme. Emphasis is given to defining and improving catalyst utilization and costs, evaluating alternative and disposable slurry-catalyst systems, and improving catalyst recycle and recovery. During this quarter, a temperature survey was completed with the reference V catalyst and liquid recycle. Objective of this study was to determine whether the improved high-severity performance observed for the Mo catalyst with liquid recycle was also possible with the reference V catalyst. In Run 5, a temperature-space velocity study was performed with the V catalyst but without liquid recycle. In that run, plant operability dropped dramatically above 425 C. Recycle was added in Run 21, but the temperature was kept constant at the reference 426 C. This report covers results of bench-scale Run 29, which examined combined effects of liquid recycle and increased temperature.
Date: October 8, 1990
Creator: Piasecki, C.A.; Gatsis, J.G.; Liu, L.L.; Lea, C.L. & Miller, M.A.
Partner: UNT Libraries Government Documents Department

Middleware for Astronomical Data Analysis Pipelines

Description: In this paper the authors describe the approach to research, develop, and evaluate prototype middleware tools and architectures. The developed tools can be used by scientists to compose astronomical data analysis pipelines easily. They use the SuperMacho data pipelines as example applications to test the framework. they describe their experience from scheduling and running these analysis pipelines on massive parallel processing machines. they use MCR a Linux cluster machine with 1152 nodes and Luster parallel file system as the hardware test-bed to test and enhance the scalability of the tools.
Date: January 26, 2005
Creator: Abdulla, G; Liu, D; Garlick, J; Miller, M; Nikolaev, S; Cook, K et al.
Partner: UNT Libraries Government Documents Department

Remote-controlled NDA (nondestructive assay) systems for process areas in a MOX (mixed oxide) facility

Description: Nondestructive assay (NDA) systems have been designed and installed in the process area of an automated mixed-oxide (MOX) fuel fabrication facility. These instruments employ neutron coincidence counting methods to measure the spontaneous-fission rate of plutonium in the powders, pellets, and fuel pins in the process area. The spontaneous fission rate and the plutonium isotopic ratios determine the mass of plutonium in the sample. Measurements can be either attended or unattended. The fuel-pin assay system (FPAS) resides above the robotic conveyor system and measures the plutonium content in fuel-pin trays containing up to 24 pins (/approximately/1 kg of plutonium). The material accountancy glove-box (MAGB) counters consist of two slab detectors mounted on the sides of the glove box to measure samples of powder or pellets as they are brought to the load cell. Samples measured by the MAGB counters may contain up to 18 kg of MOX. This paper describes the design and performance of four systems: the fuel-pin assay system and three separate MAGB systems. The paper also discusses the role of Monte Carlo transport techniques in the detector design and subsequent instrument calibration. 5 refs., 11 figs., 6 tabs.
Date: January 1, 1989
Creator: Miller, M.C.; Menlove, H.O.; Augustson, R.H.; Ohtani, T.; Seya, M.; Takahashi, S. et al.
Partner: UNT Libraries Government Documents Department

A neutron counter for small samples

Description: The Inventory Sample Counter Model IV is the most recent neutron coincidence counter specifically designed to measure small samples. We used a combination of measurement experience and Monte Carlo modeling to design a neutron counter that can provide measurement results with an accuracy of 0.5% or better. Some applications incorporate a high-resolution detector into the neutron counter. This allows the simultaneous measurement of the plutonium isotopics using the passive gamma-ray emission and the measurement of the [sup 240]Pu effective mass using the passive neutron emission. The two results are then combined to yield the plutonium mass.
Date: January 1, 1993
Creator: Sprinkle, J.K. Jr.; Menlove, H.O.; Miller, M.C.; Russo, P.A. & Jorgensen, C.
Partner: UNT Libraries Government Documents Department