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in subjects: "Radiation Detectors 440101* -- Radiation Instrumentation-- General Detectors Or Monitors & Radiometric Instruments"  
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Particle identification in ultrarelativistic nuclear collisions

Description: The role of particle identification (PID) in both fixed-target and colliding-beam studies of ultrarelativistic nuclear (URN) collisions is examined. The demands placed on the PID systems by peculiarities of URN collisions, such as large multiplicities and the need for simultaneous measurement of a number of observables, are discussed. A variety of PID techniques are reviewed, with emphasis on their applicability and efficiency in the environment of such collisions. Two examples of PID as incorp… more
Date: April 1, 1986
Creator: DiGiacomo, N.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Performance and development of dE/dx counters

Description: The performance of existing or nearly completed detectors for particle identification by using the relativistic rise of energy loss will be discussed. Detailed analysis of systematic errors leads finally to large detector systems approaching the ultimate resolution as measured in small test devices. New methods for extracting the information from the counter with the potential of better particles separation than standard dE/dx will be presented. It includes very fine sampling, delta-ray clippin… more
Date: September 1, 1980
Creator: Walenta, A. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Neutron-detection apparatus

Description: An atomic fission counting apparatus used for neutron detection is provided with spirally curved electrode plates uniformly spaced apart in a circular array and coated with fissile material.
Date: April 24, 1981
Creator: Kopp, M.K. & Valentine, K.H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Limited-angle imaging in positron cameras: theory and practice

Description: The principles of operation of planar positron camera systems made up of multiwire proportional chambers as detectors and electromagnetic delay lines for coordinate readout are discussed. Gamma converters are coupled to the wire chambers to increase detection efficiency and improve spatial resolution. The conversion efficiencies of these converters are calculated and the results compare favorably to the experimentally measured values.
Date: October 1, 1979
Creator: Tam, K.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Avalanche localization and its effects in proportional counters

Description: Avalanche development around the anode wire in a gas proportional counter is investigated. In the region of proportional gas amplification, the avalanche is found to be well localized on one side of the anode wire, where the electrons arrive along the field lines from the point of primary ionization. Induced signals on electrodes surrounding the anode wire are used to measure the azimuthal position of the avalanche on the anode wire. Practical applications of the phenomena such as left-right as… more
Date: November 1, 1977
Creator: Fischer, J.; Okuno, H. & Walenta, A.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multiplicity sorter for shift-register coincidence electronics

Description: A multiplicity sorter for the latest Los Alamos National Laboratory version of shift-register coincidence electronics is described. The multiplicity information taken from the coincidence-gate up-down counter is decoded and gated onto the output lines by prompt real-plus-accidental (R+A) and delayed accidental (A) strobes. Multiplicities of 0-7 and greater than or equal to 8 are sorted for both the R+A and A gates.
Date: February 1, 1982
Creator: Swansen, J. E.; Collinsworth, P. R.; Krick, M. S. & Peterson, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Position-sensitive detection of slow neutrons: Survey of fundamental principles

Description: This paper sets forth the fundamental principles governing the development of position-sensitive detection systems for slow neutrons. Since neutrons are only weakly interacting with most materials, it is not generally practical to detect slow neutrons directly. Therefore all practical slow neutron detection mechanisms depend on the use of nuclear reactions to convert'' the neutron to one or more charged particles, followed by the subsequent detection of the charged particles. The different conv… more
Date: January 1, 1992
Creator: Crawford, R.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electronics Engineering Research. Final report, FY 1979

Description: Accomplishments in Electronics Engineering Research (EER) during FY79 spanned a broad range of technologies, from high-speed microelectronics to digital image enhancement; from underground probing with electromagnetic waves to detecting neutrons with a small solid-state device; and from computer systems to aid engineers, to software tools to aid programmers. This report describes the overall EER program and its objectives, summarizes progress made in FY79, and outlines plans for FY80.
Date: January 1, 1980
Creator: Weissenberger, S. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New 1-k PROM for the coincidence-counter electronics package

Description: A new programmable read-only memory (PROM) for the Los Alamos-designed neutron coincidence electronics package is described. The new 1-k PROM allows remote control of the electronics by a computer or a remote terminal through an RS-232 serial data port. No modifications of the existing unit are required.
Date: February 1, 1982
Creator: Swansen, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Centroid finding method for position-sensitive detectors

Description: A new centroid finding method for all detectors where the signal charge is collected or induced on strips of wires, or on subdivided resistive electrodes, is presented. The centroid of charge is determined by convolution of the sequentially switched outputs from these subdivisions or from the strips with a linear centroid finding filter. The position line width is inversely proportional to N/sup 3/2/, where N is the number of subdivisions.
Date: October 1, 1979
Creator: Radeka, V. & Boie, R.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Interactive modeling of scintillation pulses by visual overlay of computed pulse shapes with the raw data

Description: This interactive visual-overlay modeling technique has proven to be very useful in the analysis of scintillator response data. It has revealed cases in which the scintillation process is more complicated than might have been inferred from routine inspection of the ordinary pulse parameters. This method is especially valuable in providing basic information about energy transfer steps in a multi-component scintillator, in order to tailor scintillator systems to specific applications.
Date: January 1, 1983
Creator: Fluornoy, J. M.; Lutz, S. S.; Franks, L. A.; Ashford, C. B. & Lyons, P. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Large acceptance spectrometers for. pi. /sup 0/ mesons. [Produced in heavy ion reactions]

Description: A spectrometer composed of lead-oxide loaded glass blocks has been constructed for detection of neutral pi mesons emitted in low energy heavy ion reactions. The spectrometer detects the Cerenkov radiation emitted when the high energy photons (E..gamma.. approx. 70 MeV) resulting from ..pi../sup 0/ decay create electron-position pairs in the glass, initiating electromagnetic showers. A geometric acceptance of better than 5% of 4..pi.. is possible; the ..pi../sup 0/ detection efficiency varies be… more
Date: January 1, 1984
Creator: Awes, T. C.; Ferguson, R. L.; Obenshain, F. E.; Plasil, F.; Young, G. R.; Braun-Munzinger, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Scintillation neutron detectors

Description: Two basic types of scintillation area neutron detectors are reviewed. The first is the prompt detector which uses photomultipliers to convert the neutron scintillations to electrical pulses. These signals are combined in weighting or encoding circuits to give event location. Several embodiments of the weighted and coded scintillator approach are mentioned. The second type of scintillation detector is based on television techniques and has a delayed readout. In this method all the light (or as m… more
Date: January 1, 1984
Creator: Davidson, J.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-level neutron coincidence counter (HLNCC): users' manual

Description: This manual describes the portable High-Level Neutron Coincidence Counter (HLNCC) developed at the Los Alamos Scientific Laboratory (LASL) for the assay of plutonium, particularly by inspectors of the International Atomic Energy Agency (IAEA). The counter is designed for the measurement of the effective /sup 240/Pu mass in plutonium samples which may have a high plutonium content. The following topics are discussed: principle of operation, description of the system, operating procedures, and ap… more
Date: June 1, 1979
Creator: Krick, M. S. & Menlove, H. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Neutron response characteristics of CR-39 polymer for reactor and dosimetry applications

Description: A desensitized etching technique has been developed which has resulted in an excellent differential energy response for alpha particles in the energy range 3 to 14 MeV. This response complements the previously reported differential proton and integral alpha energy responses obtained with different etching techniques. Proton recoil track yields and diameter distributions have been measured for CR-39 polymer solid state track recorders which were exposed to monoenergetic neutron sources in the en… more
Date: September 4, 1981
Creator: Ruddy, F. H.; Gold, R.; Preston, C. C.; Roberts, J. H.; Benton, E. V. & Schraube, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Buffon needle method of track counting

Description: A new technique of quantitative track counting, the Buffon needle method, is advanced. It is based on random sampling of the solid state track recorder (SSTR) surface. This new method extends quantitative track scanning to track densities well up into the track pile-up regime. It is shown that the Buffon needle method possesses a reduced dependence upon both track density nonuniformity and track size distribution. Sources of experimental error arising in the Buffon needle method are assessed. T… more
Date: September 4, 1981
Creator: Gold, R.; Roberts, J.H. & Ruddy, F.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Is CR39 worth the effort

Description: CR39 proton sensitive track detectors were greeted by the radiation protection community at the end of the last decade as a major breakthrough for personnel neutron dosimetry. A number of laboratories eagerly began research on application of CR39 to their dosimetry needs. However, in the last two or three years the enthusiasm has subsided, and many health physicists have stopped working with the material. The number of participants using CR39 in the Oak Ridge National Laboratory Personnel Inter… more
Date: December 2, 1987
Creator: Griffith, R.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of a criticality alarm system neutron detector: Final project report

Description: The primary objective of this project was to develop a prototype neutron detector for use in criticality alarm systems (CASs) at US Department of Energy (DOE) and contractor facilities wherever significant amounts of fissile material are processed or stored. Constraints placed on the design of the detector were that the overall size of the detector was to be as small as practical, the input voltage requirements were to be no more than 24 V, and that the gamma sensitivity would be as low as poss… more
Date: May 1, 1989
Creator: O'Dell, A.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An alpha/beta/gamma health physics instrument with pulse-shape discrimination

Description: A recent breakthrough in alpha scintillation detector design supports the feasibility of extending this new technology to the development of a monolithic alpha/beta/gamma ({alpha}/{beta}/{gamma}) scintillation detector. The new scintillator is physically robust and chemically resistant to environmental conditions encountered in radiation monitoring, and yet inexpensive to manufacture. The use of pulse-shape discrimination electronics allows pulses from each scintillator to be separated for part… more
Date: January 1, 1990
Creator: McElhaney, S. A.; Chiles, M. M. & Ramsey, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design report on a 10-in. multiwire proportional chamber (MWPC) and associated electronics

Description: We discuss the design and specifications of a 10-in. x 10-in. active area wire chamber. Several of these chambers will be combined with polyethylene converters to make a large volume detector intended for use as a high-energy detector displaying moderate energy resolution. We also discuss the amplifiers and discriminators that have been designed for these chambers. This report only concerns the wire chambers and electronics.
Date: February 1, 1987
Creator: MacArthur, D.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gain reduction due to space charge at high counting rates in multiwire proportional chambers

Description: Measurements with a small MWPC of gas gain reduction, due to ion space charge at high counting rates, have been compared with theoretical predictions. The quantity ln(q/q/sub 0/)/(q/q/sub 0/), where (q/q/sub 0/) is the relative reduced avalanche charge, has been found to be closely proportional to count rate, as predicted. The constant of proportionality is in good agreement with calculations made with a modified version of the original, simplified theory.
Date: October 1, 1986
Creator: Smith, G.C. & Mathieson, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental study of the signals from a segmented cathode drift chamber

Description: A test drift chamber has been constructed with a segmented cathode for measuring the second coordinate. A corona discharge source has also been constructed to measure the response of the cathode segments. Various size segments were studied and the position resolution and pulse height distributions measured.
Date: October 1, 1978
Creator: Fancher, D.L. & Schaffer, A.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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