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Nuclear Science, IEEE Transactions on

Issue 3 • Date June 1983

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Displaying Results 1 - 23 of 23
  • Table of contents

    Page(s): c1
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  • IEEE Transactions on Nuclear Science

    Page(s): c2
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  • The Nucleus

    Page(s): 1833
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  • Editorial the Two Faces of the Atom

    Page(s): 1834
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  • Approximate Noninteractive Power Regulation of a Coupled-Core Nuclear Reactor

    Page(s): 1835 - 1842
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    The present paper describes an application of an approximate decoupling control to the noninteractive power regulation of each core in a coupled-core nuclear reactor model. A method for designing an approximate decoupling controller is presented here. This controller consists of an output feedback compensator and a precompensator which is introduced to diagonalize an open-loop frequency response matrix approximately in the frequency range important to reactor dynamics. A " multipoint diagonalization method " is adopted for the design of the precompensator. This method possesses some superiorities compared with the pseudo-diagonalization method. Digital simulations and graphical studies by the Gershgorin band demonstrate the usefulness of the multipoint diagonalization method as well as the effectiveness of the controller for power regulation. View full abstract»

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  • Image Reconstruction from List-Mode Data in an Emission Tomography System Having Time-of-Flight Measurements

    Page(s): 1843 - 1849
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    List-mode data collected in a positron-emission tomography system having time-of-flight measurements are three dimensional, but all algorithms which have been published to date operate on two-dimensional data derived from these three-dimensional data. We argue in this paper that the additional information present in the three-dimensional data is useful for improving reconstructions of images. View full abstract»

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  • On-Line Fault Diagnosis in a Nuclear Reactor by Sequential Testing

    Page(s): 1850 - 1855
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    A sequential test technique for on-line fault diagnosis of sensor signals has been developed and successfully demonstrated in an operating nuclear reactor. The methodology provides a systematic procedure for detection and isolation of sensor failures by taking into account consistencies among all available measurements of a given process variable. Fault diagnosis is accomplished on the basis of the cumulative information derived from the measurement history that includes the past and current observations. View full abstract»

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  • Time Dependence of the Induced Charge in Closed Ended HP Ge Detectors

    Page(s): 1862 - 1869
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    Starting from energy balance considerations, the time dependence of the induced charge in closed ended HPGe gamma detectors is numerically determined as a function of detectors geometry, applied voltage and coordinates of created e-h pairs. These data can support the choice of geometry and applied voltage for the optimal use of closed ended detectors. View full abstract»

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  • Reconstruction from Limited Angular Projection Data Using Constrained Optimization

    Page(s): 1870 - 1879
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    In this paper, a new type of pixel decomposition is introduced to suppress modeling noise and then an algebraic method is developed for reconstruction from limited angular projection data. The basic idea with this method is to directly control the tradeoff between resolution and noise, taking into account the uncertainty of the discrepancy criterion generally used in an algebraic method for reconstruction. The results of a simulation using a simple mathematical phantom are also presented, demonstrating the effectiveness of this method. View full abstract»

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  • Radiation Effects on MOS Devices: Dosimetry, Annealing, Irradiation Sequence, and Sources

    Page(s): 1880 - 1884
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    This paper reports on some investigations of dosimetry, annealing, irradiation sequences, and radioactive sources, involved in the determination of radiation effects on MOS devices. Results show that agreement in the experimental and theoretical surface to average doses support the use of thermo-luminescent dosimeters (manganese activated calcium fluoride) in specifying the surface dose delivered to thin gate insulators of MOS devices. Annealing measurements indicate the existence of at least two energy levels, or activation energies, for recovery of soft oxide MOS devices after irradiation by electrons, protons, and gammas. Damage sensitivities of MOS devices were found to be independent of combinations and sequences of radiation type or energies. Comparison of various gamma sources indicated a small dependence of damage sensitivity on the Cobalt facility, but a more significant dependence in the case of the Cesium source. These results were attributed to differences in the spectral content of the several sources. View full abstract»

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  • A Pattern Recognition Method for Nuclear Reactor Core Surveillance

    Page(s): 1885 - 1891
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    An automatic method for reactor core surveillance is described which employs pattern recognition techniques. A core vibration surveillance method for a pressurized water reactor has been developed which provides the early detection of failures. The method allows on-line application and is able to give quick surveillance decisions (in about one minute). The sensors are eight ex-core ionization chambers. The system is very flexible and adaptable to the statistical properties of the data. The algorithms used are heuristic but need only the definition of a small number of parameters. These parameters may be optimized either by automatic procedures or by explicit experimental methods. Some experimental results are presented. View full abstract»

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  • Experimental Results of the Dichotomic Sampling in Circular Ring Positron Emission Tomograph

    Page(s): 1892 - 1898
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    Experimental verification of the new dichotomic sampling scheme was attempted and applied to a circular ring PET system to improve the sampling thereby the overall system resolution and its performances. In the experiment, two different types of aperture collimators were adopted for high resolution (HR) and very high resolution (VHR) imaging. In HR mode, a resolution of 6.5 mm FWHM was obtained without appreciable degradation in overall sensitivity which represents a threefold resolution improvement over the original system. In phantom studies with HR mode a sensitivity of 4500 counts/sec/¿Ci/cc was obtained for a 20 cm diameter uniform phantom filled with water. VHR mode experiment was also conducted to observe the ultimate resolution capability of DICHOTOM-I system and resolution of 4.2 mm FWHM was obtained at the expense of sensitivity reduction by a factor of four from HR mode experiment. View full abstract»

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  • Study of R.f., Gradient Pulse and Magnet Instability Effect in NMR Tomography

    Page(s): 1899 - 1904
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    Newly emerged NMR imaging requires careful studies on r. f. pulse shapes and sequencing for the selection of the region, gradient pulsing for the 2- or 3-D spatial coding, and suitable signal handling technique for the compensation of the inherent instability of the system, especially fluctuation of the static magnetic field. Above subjects are discussed in detail and a new method which would be useful for the line integral projection reconstruction is proposed. The method could equally be applied to other 3-D NMR imaging techniques such as KWE (Kumar-Welti-Ernst) direct Fourier reconstruction or planar integral projection type reconstruction. View full abstract»

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  • New Health Physics Perspectives Affecting Instrumentation Technology

    Page(s): 1905 - 1907
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    Measurements obtained from health physics instrumentation are basic to the radiation control process and are used by management to assure that radiation exposures are kept within limits specified by national-international authorities. Because of this inseparable relationship, health physics instrumentation must be keyed on a continuing basis to changes in radiation exposure standards. In the last five years, there have been dramatic changes to the basic radiation protection standards. These changes should be evaluated in the context of the need for corresponding changes in instrumentation technology. At the time these assessments are made, care must be exercised to assure that radiation protection standards are not dictated by inadequate state-of-the-art technology. It is imperative that the development pathway to be followed be properly structured. This is particularly true for "critical" instrumentation standards i.e., those standards directly related to the determination of the radiation status of the worker, public, and their environment. View full abstract»

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  • Digital Computers in Candu Safety Systems Part I History and Concepts

    Page(s): 1908 - 1911
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    For many years, digital computers have been used in CANDU (CANada Deuterium Uranium) reactors for direct digital control as well as control room functions such as alarm annunciation, data logging and the display of operating data on the control panels. However, until recently computers were not used in the special safety systems. This paper examines the increasing role computers are playing in CANDU safety systems, especially the two shutdown systems. The reasons for this strong trend toward increased use of computers are outlined and recent designs are described, with special emphasis on system concepts. A companion paper (Part II) describes implementation details for the safety system computer applications and summarizes the experience gained so far during development and operation of these systems. View full abstract»

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  • Digitial Computers in CANDU Safety Systems: Part II Implementation and Experience

    Page(s): 1912 - 1916
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    Microcomputer based systems have recently been applied to CANDU safety systems. This paper describes three specific systems, a monitoring system, the programmable digital comparator (PDC) system, and a fully computerized shutdown system prototype. The system configurations, the hardware and the software used to implement these designs are discussed. Each of these systems uses commercial off-the-shelf hardware which has been modified and qualified when necessary to meet specific power plant requirements. The preliminary experience which has been gained with the systems already in operation also summarized. View full abstract»

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  • Accreditation of Qualification Testing Organizations the Industry Viewpoint

    Page(s): 1917 - 1919
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    This paper presents the industry viewpoint on the program for the Accreditation of Qualification Testing Organizations, which has been proposed for rulemaking by the Nuclear Regulatory Commission. The IEEE has agreed to establish the program content, and would administer its requirements in accordance with an agreement between the NRC and IEEE of September 30th, 1981. Presented in this paper is the industry perspective, developed and prepared through the AIF, identifying the serious concerns which the accreditation program has raised. Discussed are the disadvantages of the program and those present benefits which would be lost if the program was adopted. The value of greater emphasis on current regulation to improve the qualification process is presented and the paper details areas where the NRC proposals do not provide adequate justification for the accreditation program. View full abstract»

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  • Design and Performance of Two 1k CMOS/SOS Hardened RAMs

    Page(s): 1920 - 1925
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    RCA is under contract to DoD to develop two 5V 1K CMOS/SOS RAMs capable of meeting stringent total dose and transient radiation levels. This paper presents the design, operation, characterization, and test results of the RAMs' capabilities to meet these radiation levels. The radiation resistance of these circuits is enhanced through design by dominant PMOS utilization, the exclusion of source followers, and tolerance to large threshold voltage shifts. Test results on further enhancement through radiation hardened processing are presented. This effort demonstrates a factor of 5 to 10 improvement in circuit radiation hardness by consideration of technology radiation characteristics in the design phase. Hardened processing can extend the performance of these parts to total dose environments in excess of 500K rads making them useful in extended space missions and severe military environments. View full abstract»

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  • Correction

    Page(s): 1925
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  • IEEE copyright form

    Page(s): 1925-a - 1925-c
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  • Information for authors

    Page(s): 1925d
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  • Affiliate Plan of the IEEE Nuclear and Plasma Sciences Society

    Page(s): 1925-e
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Aims & Scope

IEEE Transactions on Nuclear Science focuses on all aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.

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