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Illinois department of public health H1N1/A pandemic communications evaluation survey.

Description: Because of heightened media coverage, a 24-hour news cycle and the potential miscommunication of health messages across all levels of government during the onset of the H1N1 influenza outbreak in spring 2009, the Illinois Department of Public Health (IDPH) decided to evaluate its H1N1 influenza A communications system. IDPH wanted to confirm its disease information and instructions were helping stakeholders prepare for and respond to a novel influenza outbreak. In addition, the time commitment involved in preparing, issuing, monitoring, updating, and responding to H1N1 federal guidelines/updates and media stories became a heavy burden for IDPH staff. The process and results of the H1N1 messaging survey represent a best practice that other health departments and emergency management agencies can replicate to improve coordination efforts with stakeholder groups during both emergency preparedness and response phases. Importantly, the H1N1 survey confirmed IDPH's messages were influencing stakeholders decisions to activate their pandemic plans and initiate response operations. While there was some dissatisfaction with IDPH's delivery of information and communication tools, such as the fax system, this report should demonstrate to IDPH that its core partners believe it has the ability and expertise to issue timely and accurate instructions that can help them respond to a large-scale disease outbreak in Illinois. The conclusion will focus on three main areas: (1) the survey development process, (2) survey results: best practices and areas for improvement and (3) recommendations: next steps.
Date: September 16, 2010
Creator: Walsh, D. & Sciences, Decision and Information
Partner: UNT Libraries Government Documents Department

Simultaneous Nuclear Reaction Analysis of Boron and Phosphorus in Thin Borophosphosilicate Glass Films Using (A,P) Reactions

Description: A method combining ({alpha},p) NRA and ellipsometry has been developed for measuring the Boron and Phosphorus content of borophosphosilicate glass (BPSG) used for interlevel dielectrics in integrated circuits. Yields from the {sup 31}P({alpha},p{sub 0}){sup 34}S (Q = 0.63 MeV) and {sup 10}B({alpha},p{sub 0}) {sup 13}C (Q = 4.06 MeV) reactions are coupled with ellipsometry thickness measurements to calculate the average atomic percent of B and P in the film. Due to the relatively low Q value of the {sup 31}P({alpha},p{sub 0}){sup 34}S reaction and the thickness range of the glass films ({le} 1.2 micrometers) they analyze, fairly high energy alpha particles, and Mylar range foils on the detector are required. Alpha energy, detector angle and range foil thickness were determined by reaction yields and the need to separate the yield peaks of interest from competing ({alpha},p) reactions and backscattered alphas. They have determined that 6.0 MeV incident alphas with a detector angle of 135{degree} and about 100 micrometers of Mylar range foil are optimum for the system. The yield for the {sup 10}B({alpha},p{sub 0}) {sup 13}C reaction is quite constant in the energy range of interest ({approximately} 5.8 to 6 MeV) but the yield for the {sup 31}P({alpha},p{sub 0}){sup 34}S is not. Consequently, a simple conversion from standard BPSG reference samples (independently quantified by ICP mass spectrometry) is adequate to calculate a film's %B content. The %P calculation is more complex, involving a three-dimensional fit of the P yield data and measured film thickness to the film %P content. This fit is based upon yield data from a matrix of standard film samples. The technique is sensitive to 0.1% with an accuracy of {+-}3 to {+-}10% depending on the sample. This measurement method is used routinely at Sandia National Laboratories in support of their fabrication process lines.
Date: June 22, 1999
Creator: Walsh, D.S. & Doyle, B.L.
Partner: UNT Libraries Government Documents Department

EpiPOD : community vaccination and dispensing model user's guide.

Description: EpiPOD is a modeling system that enables local, regional, and county health departments to evaluate and refine their plans for mass distribution of antiviral and antibiotic medications and vaccines. An intuitive interface requires users to input as few or as many plan specifics as are available in order to simulate a mass treatment campaign. Behind the input interface, a system dynamics model simulates pharmaceutical supply logistics, hospital and first-responder personnel treatment, population arrival dynamics and treatment, and disease spread. When the simulation is complete, users have estimates of the number of illnesses in the population at large, the number of ill persons seeking treatment, and queuing and delays within the mass treatment system--all metrics by which the plan can be judged.
Date: January 9, 2009
Creator: Berry, M.; Samsa, M.; Walsh, D. & Sciences, Decision and Information
Partner: UNT Libraries Government Documents Department

Software development for a switch-based data acquisition system

Description: We report on the software aspects of the development of a switch-based data acquisition system at Fermilab. This paper describes how, with the goal of providing an ``integrated systems engineering`` environment, several powerful software tools were put in place to facilitate extensive exploration of all aspects of the design. These tools include a simulation package, graphics package and an Expert System shell which have been integrated to provide an environment which encourages the close interaction of hardware and software engineers. This paper includes a description of the simulation, user interface, embedded software, remote procedure calls, and diagnostic software which together have enabled us to provide real-time control and monitoring of a working prototype switch-based data acquisition (DAQ) system.
Date: December 1, 1991
Creator: Booth, A.; Black, D. & Walsh, D.
Partner: UNT Libraries Government Documents Department

Manganese-Copper Damping Alloys

Description: From Introduction: "The primary purpose of this bulletin is to describe the metallurgical treatment and properties of the alloys as developed in research at the laboratories of the Bureau of Mines at Rolla, Mo., and to present a substantial amount of unpublished data."
Date: 1965
Creator: Jensen, J. W. & Walsh, D. F.
Partner: UNT Libraries Government Documents Department

Flammability Characteristics of Combustible Gases and Vapors

Description: From Introduction: "The purpose of this bulletin is to present a general review of the subject of flammability, and to supply select experimental data and empirical rules on the flammability characteristics of various families of combustible gases and vapors in the air and other oxidizing atmospheres."
Date: 1965
Creator: Jensen, J. W. & Walsh, D. F.
Partner: UNT Libraries Government Documents Department

A new approach to nuclear microscopy: The ion-electron emission microscope

Description: A new multidimensional high lateral resolution ion beam analysis technique, Ion-Electron Emission Microscopy or IEEM is described. Using MeV energy ions, IEEM is shown to be capable of Ion Beam Induced Charge Collection (IBICC) measurements in semiconductors. IEEM should also be capable of microscopically and multidimensionally mapping the surface and bulk composition of solids. As such, IIEM has nearly identical capabilities as traditional nuclear microprobe analysis, with the advantage that the ion beam does not have to be focused. The technique is based on determining the position where an individual ion enters the surface of the sample by projection secondary electron emission microscopy. The x-y origination point of a secondary electron, and hence the impact coordinates of the corresponding incident ion, is recorded with a position sensitive detector connected to a standard photoemission electron microscope (PEEM). These signals are then used to establish coincidence with IBICC, atomic, or nuclear reaction induced ion beam analysis signals simultaneously caused by the incident ion.
Date: November 1, 1998
Creator: Doyle, B.L.; Vizkelethy, G.; Walsh, D.S.; Senftinger, B. & Mellon, M.
Partner: UNT Libraries Government Documents Department

Depth profiling of oxidized a-C:D Layers on Be -- A comparison of {sup 4}He RBS and {sup 28}Si ERD analysis

Description: In applications dealing with the deposition of amorphous hydrogenated carbon layers or in the determination of the composition of deposited layers on the walls of nuclear fusion plasma experiments, the analysis of mixtures of light elements on heavy substrates is necessary. Depth profiling by means of RBS is often difficult due to the overlap of the backscattering intensities of different constituents from different depths. The erosion and reaction of deposited amorphous deuterated carbon (a-C:D) films with a Be substrate due to annealing in air poses an analytical challenge especially if simultaneously the exchange of hydrogen isotopes should be monitored. The analysis of the different recoiling atoms from collisions with heavy ions in Elastic Recoil Detection (ERD) can provide a tool which resolves all constituents in a single analysis. In the present study the composition of intermixed layers on Be containing H, D, Be, C and O has been analyzed using conventional {sup 4}He RBS at 2.2 MeV together with 2.5 MeV {sup 4}He ERD for hydrogen isotope analysis. At these energies, an overlap of signals from different constituents could be avoided in most cases. As alternative method heavy ion ERD using Si{sup 7+} ions extracted from a 5 MeV Tandem Van de Graff accelerator was investigated. At a scattering angle of 30{degree} Si ions could not be scattered into the detector and a solid state detector without protecting foil could be used. Even in the intermixed layers at terminal energies of 5 MeV the heavy constituents could be separated while signals from recoiling hydrogen and deuterium atoms could be resolved on top of the signal from the Be substrate. For the analysis of the RBS and ERD data the newly developed spectra simulation program SIMNRA has been used which includes a large data bank for scattering and nuclear reaction cross ...
Date: June 1, 1997
Creator: Roth, J.; Mayer, M.; Walsh, D. & Wampler, W.R.
Partner: UNT Libraries Government Documents Department

Hydrothermally treated coals for pulverized coal injection. Final technical report

Description: This project investigated the suitability of hydrothermally dried low-rank coals for pulverized fuel injection into blast furnaces in order to reduce coke consumption. Coal samples from the Beluga coalfield and the Usibelli Coal Mine, Alaska, were used for the study. Crushed coal samples were hydrothermally treated at three temperatures, 275, 300 and 325{degrees}C, for residence times of 10, 60 and 120 minutes. Products were characterized to determine their suitability for pulverized coal injection. Characterization included proximate and ultimate analyses, vitrinite reflectance and TGA reactivity. A literature survey was also conducted.
Date: October 1, 1995
Creator: Walsh, D.E.; Rao, P.D.; Ogunsola, O. & Lin, H.K.
Partner: UNT Libraries Government Documents Department

Hydrothermally treated coals for pulverized coal injection. Technical progress report, April 1995--June 1995

Description: This project is investigating the suitability of hydrothermally dried low-rank coals for pulverized fuel injection into blast furnaces in order to reduce coke consumption. Coal samples from the Beluga coal field and Usibelli Coal Mine, Alaska, are being used for the study. Crushed coal samples were hydrothermally treated at three temperatures, 275, 300 and 325{degrees}C, for residence times ranging from 10 to 120 minutes. Products have been characterized to determine their suitability for pulverized coal injection. Characterization includes proximate and ultimate analyses, vitrinite reflectance, TGA reactivity and thermochemical modeling. A literature survey has been conducted.
Date: July 1, 1995
Creator: Walsh, D.E.; Rao, P.D.; Ogunsola, O. & Lin, H.K.
Partner: UNT Libraries Government Documents Department

Ion Beam Induced Charge Collection (IBICC) Studies of Cadmium Zinc Telluride (CZT) Radiation Detectors

Description: Cadmium Zinc Telluride is an emerging material for room temperature radiation detectors. In order to optimize the performance of these detectors, it is important to determine how the electronic properties of CZT are related to the presence of impurities and defects that are introduced during the crystal growth and detector fabrication. At the Sandia microbeam facility IBICC and Time Resolved IBICC (TRIBICC) were used to image electronic properties of various CZT detectors. Two-dimensional areal maps of charge collection efficiency were deduced from the measurements. In order to determine radiation damage to the detectors, we measured the deterioration of the IBICC signal as the function of dose. A model to explain quantitatively the pattern observed in the charge collection efficiency maps of the damaged detectors has been developed and will be discussed in the paper.
Date: July 22, 1999
Creator: Doyle, B.L.; Vizkelethy, G. & Walsh, D.S.
Partner: UNT Libraries Government Documents Department

He self-pumping by tokamak pump limiter materials: Al, V, Ni, and Ni/Al alloys

Description: An ECR plasma and Colutron ion gun were used to study He self-pumping by several possible pump-limiter materials: Ni, V, Al, and Ni/Al multi-layers. Ni and V exhibited similar pumping capacities (6 {times} 10{sup 15} He/cm{sup 2}, 200 eV) whereas Al showed a reduced capacity (6 {times} 10{sup 14} He/cm{sup 2}, 200 eV) due to increased sputtering. A He retention model based upon ion implantation ranges and sputtering rates agreed with the experimental data. The pumping efficiency increased significantly with ion energy. A new multilayer/bilayer pumping concept showed improved pumping above that for single element films. 4 refs., 5 figs.
Date: January 1, 1991
Creator: Outten, C. A.; Barbour, J. C.; Doyle, B. L. & Walsh, D. S.
Partner: UNT Libraries Government Documents Department

Hydrothermally treated coals for pulverized coal injection. [Quarterly] technical progress report, January--March 1995

Description: This project is investigating the suitability of hydrothermally dried low-rank coals for pulverized fuel injection into blast furnaces in order to reduce coke consumption. Coal samples from the Beluga coal field and the Usibelli Coal Mine, Alaska, are being used for the study. Crushed coal samples were hydrothermally treated at three temperatures, 275, 300 and 325{degrees}C, for residence times ranging from 10 to 120 minutes. Products are being characterized to determine their suitability for pulverized coal injection. Characterization includes proximate and ultimate analyses, vitrinite reflectance and TGA reactivity. A literature survey is being conducted.
Date: April 1, 1995
Creator: Walsh, D.E.; Rao, P.D.; Ogunsola, O. & Lin, H.K.
Partner: UNT Libraries Government Documents Department

Microbeam RBS on flat panel displays

Description: The authors have demonstrated the utility of microbeam - Rutherford Back Scattering ({mu} RBS) in spatially resolved studies of operational plasma effects on the interior surfaces of plasma flat panel displays manufactured by Photonics Imaging. The experiments were performed at the Sandia Nuclear microprobe using a 2.8 MeV He beam with an average beam spot size of less than 8{mu}m. The interior surface of the top panes of the flat panels is composed of approximately 800 nm of MgO on top of a 2000nm thick PbO layer. {mu}-RBS of sample panels operated under varying conditions measured changes in the surface MgO film thickness due to plasma erosion and redeposition as accurately as {+-}1.5 nm. The high accuracy in the MgO thickness measurement was achieved by inferring the MgO thickness from the shift of the Pb front edge in the RBS spectrum. An estimate for the thickness accuracy as a function of the acquired statistics is presented. The surface of the flat panels` bottom panes is also comprised of MgO on top of PbO. However, troughs {approximately}100 {mu}m wide by 10{mu}m deep were partially filled with phosphor and cover the entire width of the surface. This leaves only 100pm long sections of MgO within the trough exposed. Using {mu}-RBS, the authors were able to analyze the surface composition of these regions.
Date: December 31, 1996
Creator: Schoene, H.; Walsh, D.; McGrath, R.T. & Burkhart, J.H.
Partner: UNT Libraries Government Documents Department

Solution structure of the cAMP-dependent protein kinase

Description: This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project as Los Alamos National Laboratory (LANL). Protein phosphorylation is well established as one of the most important mechanisms of signal transduction and cellular regulation. Two of the key enzymes that catalyze these phosphorylation reactions are the cAMP- (PKA) and cGMP- (PKG) dependent protein kinases. PKA has served as the prototypic model of this class of enzymes that now comprises in excess of 300 phylogenetically related proteins. A large number of these protein kinases are critical for the regulation of cell function and a full analysis of their similarities and differences is essential to understand their diverse physiological roles. The cAMP-dependent protein kinase has the subunit structure R2C2, in which C and R refer to the catalytic and regulatory subunits, respectively. The cGMP-dependent protein kinase (PKG) is highly homologous to PKA but is distinguished from it by having the regulatory and catalytic domains on a contiguous polypeptide. The studies described here use small-angle scattering and Fourier Transform InfraRed (FTIR) spectroscopy to study domain movements and conformational changes in these enzymes in different functional states in order to elucidate the molecular bases for the regulation of their activities.
Date: December 31, 1998
Creator: Trewhella, J.; Olah, G. A.; Walsh, D. A. & Mitchell, R. D.
Partner: UNT Libraries Government Documents Department

Runaway electron damage to the Tore Supra Phase III outboard pump limiter

Description: Operation of the Phase III outboard pump limiter (OPL) in Tore Supra in 1994 was terminated prematurely when runaway electrons during the current decay following a disruption pierced leading edge tube on the electron side and caused a water leak. The location, about 20 mm outside the last closed flux surface during normal operation, and the infrared (IR) images of the limiter indicate that the runaways moved in large outward steps, i.e. tens of millimeters, in one toroidal revolution. For plasma (runaway) currents in the range of 155 to 250 kA, the drift orbits open to the outside. Basic trajectory computations suggest that such motion is possible under the conditions present for this experiment. Activation measurements made on sections of the tube to indicate the area of local damage are presented here. An understanding of this event may provide important guidance regarding the potential damage from runaways in future tokamaks.
Date: August 1996
Creator: Nygren, R.; Lutz, T.; Walsh, D.; Martin, G.; Chatelier, M.; Loarer, T. et al.
Partner: UNT Libraries Government Documents Department

H-Isotope Retention and Thermal/Ion-Induced Release in Boronized Films

Description: Over the past decade, it has been clearly demonstrated that the composition of the very near surface ({approximately}100nm) of plasma-interactive components plays a determinant role in most processes which occur in the plasma-edge of Tokamaks. Two very successful techniques to effect control of the plasma-wall interaction are (1) in-situ deposition of amorphous carbon or boron-carbon films and (2) the use of He/C conditioning discharges or He glow discharge cleaning to modify the near surface of bulk graphite components. We have deposited boronized layers into Si using plasma-assisted CVD and sputter deposition. The PCVD deposition conditions were as close as possible to those used in TFTR, and some films deposited in TFTR have also been studied. Using these two deposition techniques, B{sub x}CH{sub y} films have been produced with x varying from 1/2 -- 4, and y from {approximately}1 (sputtered) to {approximately}3 (PCVD). Most films also contained significant amounts of 0. Thermal and ion-induced release of H-isotopes from BC films is qualitatively similar to that measured for graphite. Implanted H saturates in these films at a H/host atom ratio of 0.7 which is considerably higher than that of graphite({approximately}0.4). As-deposited PCVD films are already saturated with H, while sputtered films are not. Sputtered BC films therefore possess an inherent H-pumping capability which could prove to be extremely beneficial to TFTR. 16 refs., 5 figs., 1 tab.
Date: 1990
Creator: Walsh, D. S.; Doyle, B. L.; Wampler, W. R. & Hays, A. K.
Partner: UNT Libraries Government Documents Department

Solution structure analysis of the conformational changes that occur upon the binding of the protein kinase inhibitor peptide to the catalytic subunit of the cAMP dependent protein kinase

Description: Fourier transform infrared (FTIR) spectroscopy and small-angle x-ray scattering experiments have been used to examine both the secondary structure content and overall conformation, respectively, of the catalytic subunit of the cAMP-dependent protein kinase and to characterize the structural change that occurs upon binding of the protein kinase inhibitor peptide, PKI(5-22)amide. While the secondary structure of the enzyme is unaltered by the binding of PKI(5-22)amide, a large overall conformational change occurs resulting in a compaction of the enzyme that is characterized by a 2{angstrom} decrease in radius of gyration, Rg, and an 11{angstrom} decrease in the maximum linear dimension, d{sub max}. We have modeled the conformational change as a simple rotation of the upper and lower lobes of the kinase by 39{degrees} about a molecular hinge defined by Glyl25, resulting in a closure of the cleft between the two lobes of the kinase. These data are evaluated with respect to recent x-ray crystallographic studies of the cAMP-dependent protein kinase, CDK2 protein kinase, and the MAP kinase ERK2. In addition, the implications that these findings have for the remainder of the protein kinase family are discussed.
Date: October 1, 1994
Creator: Mitchell, R. D.; Walsh, D. A.; Olah, G. A.; Sosnick, T. R. & Trewhella, J.
Partner: UNT Libraries Government Documents Department

Radiation damage measurements in room temperature semiconductor radiation detectors

Description: The literature of radiation damage measurements on cadmium zinc telluride (CZT), cadmium telluride (CT), and mercuric iodide (HgI{sub 2}) is reviewed and in the case of CZT supplemented by new alpha particle data. CZT strip detectors exposed to intermediate energy (1.3 MeV) proton fluences exhibit increased interstrip leakage after 10{sup 10} p/cm{sup 2} and significant bulk leakage after 10{sup 12} p/cm{sup 2}. CZT exposed to 200 MeV protons shows a two-fold loss in energy resolution after a fluence of 5 {times} 10{sup 9} p/cm{sup 2} in thick (3 mm) planar devices but little effect in 2 mm devices. No energy resolution effects were noted from moderated fission spectrum of neutrons after fluences up to 10{sup 10} n/cm{sup 2}, although activation was evident. Exposures of CZT to 5 MeV alpha particle at fluences up to 1.5 {times} 10{sup 10} {alpha}/cm{sup 2} produced a near linear decrease in peak position with fluence and increases in FWHM beginning at about 7.5 {times} 10{sup 9} {alpha}/cm{sup 2}. CT detectors show resolution losses after fluences of 3 {times} 10{sup 9} p/cm{sup 2} at 33 MeV for chlorine-doped detectors. Indium doped material may be more resistant. Neutron exposures (8 MeV) caused resolution losses after fluences of 2 {times} 10{sup 10} n/cm{sup 2}. Mercuric iodide has been studied with intermediate energy protons (10 to 33 MeV) at fluences up to 10{sup 12} p/cm{sup 2} and with 1.5 GeV protons at fluences up to 1.2 {times} 10{sup 8} p/cm{sup 2}. Neutron exposures at 8 MeV have been reported at fluences up to 10{sup 15} n/cm{sup 2}. No radiation damage was reported under these irradiation conditions.
Date: December 1, 1998
Creator: Franks, L.A.; Olsen, R.W.; James, R.B.; Brunett, B.A.; Walsh, D.S.; Doyle, B.L. et al.
Partner: UNT Libraries Government Documents Department

Ion Beam Induced Charge Collection (IBICC) Studies of Integrated Circuits Using a 10MeV Carbon Microbeam

Description: As feature sizes of Integrated Circuits (ICs) continue to shrinlL the sensitivity of these devices, particularly SRAMS and DR4Ms, to natural radiation is increasing. The radiation can lead to the uncontrolled deposition of charge within an IC, which ean alter, for example, the memoty state of a bit and thereby produce what is edled a `SOW error, or Single Event Upset (SEU). The response of ICS to natural background radiation is therefore of great coneem regarding the reliability of Mure devices. In this paper, we present results where Ion Beam Induced Charge Collection (TBICC) technique was used to simulate neutron-induced Si recoil dlkcts in IC test structures. The present wo~ wnducted at the San& National Laboratories, uses a 10 MeV Carbon mierobeam with 1 pm spot to scan test structures on specifically designed ICS. The test structure contains junctions typical of S RAMS and DRAMs. Charge is eolleeted from different areas of the IC under various conditions of junction back bias. The data are digitized and displayed as 3D images combined with KY) coordination. With the aid of IC layout informatio~ the 3D images are sepamted into difTerent layers to allow the identification of charge collection etlciency in the test structures. An analysis of the charge collection efficiency from dillerent test areas is given.
Date: September 29, 1998
Creator: Aton, T.J.; Bouanani, M. E.; Doyle, B.L.; Duggan, J.L.; Guo, B.N.; McDaniel, F.D. et al.
Partner: UNT Libraries Government Documents Department

A new method for making shallow p-type junctions

Description: In this paper the authors present a new method for making shallow p-type junctions in silicon by molecular ion implantation. Unlike current molecular ion implantation methods which use boron and fluorine molecules, this new method uses an element which is completely miscible in silicon. Note that fluorine is an element that saturates at a very low concentration in silicon. The compounds used in this new method are boron silicides and boron germanium molecules. These compounds have several distinct advantages including the facts that the co-element silicon (or germanium) has a very high saturation value in the silicon matrix, the co-element is massive and therefore creates more damage during implantation, and the co-element has a larger projected range than the boron. Note that the Rp for fluorine is shallower than that of Boron for a BF{sub 2} implant. Recent experiments indicate that BSi ion beams can be generated in a sputter ion source with efficiencies of 0.5% with respect to the generated Si beam. A plan to develop a new ion source that is compatible with current ion implantation systems is presented.
Date: August 1, 1998
Creator: Ling, P.; Strathman, M.D.; Ling, C.H.; Doyle, B.; Walsh, D.; Larson, L. et al.
Partner: UNT Libraries Government Documents Department

Ion Beam Induced Charge Collection (IBICC) from Integrated Circuit Test Structures Using a 10 MeV Carbon Microbeam

Description: As future sizes of Integrated Circuits (ICs) continue to shrink the sensitivity of these devices, particularly SRAMs and DRAMs, to natural radiation is increasing. In this paper, the Ion Beam Induced Charge Collection (IBICC) technique is utilized to simulate neutron-induced Si recoil effects in ICS. The IBICC measurements, conducted at the Sandia National Laboratories employed a 10 MeV carbon microbeam with 1pm diameter spot to scan test structures on specifically designed ICS. With the aid of layout information, an analysis of the charge collection efficiency from different test areas is presented. In the present work a 10 MeV Carbon high-resolution microbeam was used to demonstrate the differential charge collection efficiency in ICS with the aid of the IC design Information. When ions strike outside the FET, the charge was only measured on the outer ring, and decreased with strike distance from this diode. When ions directly strike the inner and ring diodes, the collected charge was localized to these diodes. The charge for ions striking the gate region was shared between the inner and ring diodes. I The IBICC measurements directly confirmed the interpretations made in the earlier work.
Date: November 18, 1998
Creator: Aton, T.J.; Doyle, B.L.; Duggan, J.L.; El Bouanani, M.; Guo, B.N.; McDaniel, F.D. et al.
Partner: UNT Libraries Government Documents Department

Ion Microbeam Studies of Cadmium Zinc Telluride Radiation Detectors by IBICC

Description: Ion Beam Induced Charge Collection (IBICC) and Time Resolved IBICC (TRIBICC) techniques were e for imaging electronic properties of Cadmium Zinc Telluride (CZT) room temperature radiation detectors. The detectors were bombarded with a scanned 5.4 MeV He microbeam and the detector response was analyzed at each point. The electron mobility (A) and Metime (z.), and charge collection efficiency maps were calculated from the data. In order to determine the radiation damage to the detectors, the signal deteriomtion was measured as the function of dose.
Date: October 26, 1998
Creator: Brunett, B. A.; Doyle, B. L.; James, R. B.; Olsen, R. W.; Vizkelethy, G. & Walsh, D. S.
Partner: UNT Libraries Government Documents Department