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IEEE Transactions on Nuclear Science

Issue 1 • Feb. 1977

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Displaying Results 1 - 25 of 168
  • Table of contents

    Publication Year: 1977, Page(s):1 - 8
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  • Nuclear Science and Scintillation and Semiconductor Counter Symposium Committee

    Publication Year: 1977, Page(s): 9
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  • Nuclear Power Systems Symposium Committee

    Publication Year: 1977
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  • Photographs Taken at Meeting

    Publication Year: 1977, Page(s):11 - 12
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  • The Nucleus

    Publication Year: 1977, Page(s): 13
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  • Session Chairmen Nuclear Science and Scintillation and Semiconductor Counter Symposium

    Publication Year: 1977, Page(s): 14
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  • The Use of Computers in Nuclear Medicine

    Publication Year: 1977, Page(s):15 - 19
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    Computers are needed in nuclear medicine, they answer a need to avoid loss of patient data and are necessary for image processing which deserves a wider use than it presently enjoys. The computer is nearly essential for dynamic or function studies and its use is due to increase. If a computer is to function effectively in clinical service, the processes it executes must be finished in a very short... View full abstract»

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  • Studies of the Sun from Skylab

    Publication Year: 1977, Page(s):20 - 28
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    The new and exciting contributions to solar physics, which are resulting from the NASA Skylab Program, are reviewed and their broader implications in terms of solar cycle and solar-terrestrial relations are discussed. Among the "active" phenomena studied by the Skylab Apollo Telescope Mount (ATM) solar experiments are coronal bright points, active regions, flares and coronal transient events. One ... View full abstract»

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  • The ERDA Geothermal Program

    Publication Year: 1977, Page(s):29 - 32
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    First Page of the Article
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  • Laser Fusion

    Publication Year: 1977, Page(s):33 - 47
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  • Hydrogen-Multivalent Acceptor Complexes in High-Purity Germanium

    Publication Year: 1977, Page(s):48 - 52
    Cited by:  Papers (34)
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    Using copper (a fast diffusing, multivalent acceptor impurity in Ge) we have shown that hydrogen can form complexes with multivalent acceptors. Hydrogen is incorporated in the Ge single crystal during its growth from a melt in a H2 atmosphere. By analogy with the interaction between lithium and multivalent acceptors we find two acceptor like complexes: Cu-H and Cu-H2. Using Photothermal Ionization... View full abstract»

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  • Entrance Windows in Germanium Low-Energy X-Ray Detectors

    Publication Year: 1977, Page(s):53 - 60
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1364 KB)

    We have found experimentally that high-purity Ge low-energy X-ray detectors have a relatively thick entrance window which renders them practically useless below ~ 2.3 KeV. A simple X-ray fluorescence experiment establishes clearly that the window is physically in the Ge material itself. Experiments with detectors made from different Ge crystals, and with Schottky barrier contacts of different meta... View full abstract»

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  • Amorphous Germanium as an Electron or Hole Blocking Contact on High-Purity Germanium Detectors

    Publication Year: 1977, Page(s):61 - 63
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    Experiments were performed in an attempt to make thin n+ contacts on high-purity germanium by the solid phase1 epitaxial regrowth of arsenic doped amorphous germanium. After cleaning the crystal surface with argon sputtering and trying many combinations of layers, it was not found possible to induce recrystallization below 673K. However, it was found that simple thermally evaporated amorphous Ge m... View full abstract»

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  • High-Resolution Charged-Particle Spectroscopy with High-Purity Germanium Detectors in the Intermediate Energy Range

    Publication Year: 1977, Page(s):64 - 67
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1585 KB)

    Planar detectors to be used for charged particle spectroscopy were prepared from high-purity germanium, p+-contacts being made by boron implantation, n+-contacts by either phosphorus implantation or lithium diffusion. The dead layers of the implanted contacts were about 0.2 μm. Resolution figures for alphas of 155 MeV, scattered under θLAB = 15°, are given and discussed for a ... View full abstract»

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  • Characteristics of Large Intrinsic Germanium Detectors Operated at Elevated Temperatures

    Publication Year: 1977, Page(s):68 - 72
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1665 KB)

    The operational characteristics of two large (25 and 75 cm3, coaxial) intrinsic germanium detectors have been investigated as a function of temperature in order to establish definitive base lines and design criteria for satellite-borne spectrometer systems. The selection of a cooling system and the optimization of the design are critically dependent upon the acceptable temperature limits for the o... View full abstract»

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  • Pulse Height Dependence on Source Position in a Closed-End Coaxial Hyper-Pure Germanium Gamma-Ray Detector

    Publication Year: 1977, Page(s):73 - 77
    Cited by:  Papers (2)
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    The source position effect on peak center pulse height has been investigated on a 67cm3 closed-end coaxial hyper-pure germanium gamma-ray spectrometer. When a Na-22 source was moved on the axis of the detector, the peak center energy of 1274keV gamma-rays started to decrease at 20cm and a 44eV lower pulse height was observed at 1.5cm in front of the detector. The peak center energy did not change ... View full abstract»

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  • Comparative Timing Performance of Large Volume Ge(Li) and HPGE Coaxial Detectors

    Publication Year: 1977, Page(s):78 - 87
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1240 KB)

    The timing performance of several large (8% to 12% relative efficiency) Ge(Li) and HpGe coaxial detectors has been measured and compared. The Ge(Li) detectors are capable of timing resolution which is generally 10% to 30% better than that of the HpGe devices. This resolution capability can be attributed to the higher bias voltages which can be applied to the Ge(Li) detectors. However, in some appl... View full abstract»

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  • Intrinsic efficiency of germanium - a basis for calculating expected detector efficiency

    Publication Year: 1977, Page(s):88 - 92
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1820 KB)

    A method is presented whereby the intrinsic efficiency of Ge is utilized to calculate the expected peak efficiency of detectors having a wide range of sizes. The intrinsic efficiency of Ge, which is the probability for total absorption, was measured at 122 and 136 keV in Ge(Li) coaxial detectors and HPGe planar detectors having an effective thickness ranging from 5 to 50 mm. At 136 keV it is 64% f... View full abstract»

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  • Epitaxial Silicon Semiconductor Detectors Past Developments, Future Prospects

    Publication Year: 1977, Page(s):93 - 103
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1317 KB)

    A review of the main physical characteristics of epitaxial silicon as it relates to detector development is presented. As examples of applications results are presented on (1) epitaxial silicon avalanche diodes (ESAD); signal-to-noise, non-linear aspects of the avalanche gain mechanism, gain-bandwidth product, (2) ultrathin epitaxial silicon surface barrier (ESSB) detectors, response to heavy ions... View full abstract»

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  • Thin Epitaxial Silicon for De/Dx Detectors

    Publication Year: 1977, Page(s):104 - 108
    Cited by:  Papers (7)
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    The techniques for fabricating thin self-supporting epitaxial films for dE/dx detectors have been studied. Detectors having thicknesses between 1 and 4 μm with areas of 12.5 mm2 have been fabricated and tested. The response of the detectors has been studied with alpha particles, oxygen ions, and fission fragments. View full abstract»

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  • Gamma Dosimetry by the Microplasma Phenomenon

    Publication Year: 1977, Page(s):109 - 116
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    The feasibility of employing commercially available, microwave P-N avalanche diodes as gamma radiation dosimeters was investigated. The detection method used to determine the magnitude of the radiation dose consisted of measuring the microplasma pulse counte-rate before and after the irradiation. The feasibility of this approach was established. The technique that was determined as suitable fcr th... View full abstract»

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  • Time Resolution in Semi-Conductor Detectors

    Publication Year: 1977, Page(s):117 - 120
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    An analytical expression for the prompt time response is compared with available data of prompt cures using surface-barrier detectors, yielding a relation for T½ = 0.33 τ1/√n = 0.40 τ2 τn/N where τ1, τ2 rise and decay times of single-electron response, n/N is the optimum value at minimum time resolution. A preliminary method is proposed for c... View full abstract»

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  • What Can Be Expected from High-Z Semiconductor Detectors?

    Publication Year: 1977, Page(s):121 - 125
    Cited by:  Papers (65)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1650 KB)

    It has been hoped that high-Z semiconductors would offer efficient γ-ray detection at or near ambient temperatures with energy resolution significantly better than NaI (T1) scintillators. For use at X-ray energies, this goal has been achieved with both HgI2, CdTe, and GaAs detectors. However, at higher energies (~660 keV) all current detectors have one or more significant deficiencies in t... View full abstract»

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  • PbI2 as Nuclear Particle Detector

    Publication Year: 1977, Page(s):126 - 128
    Cited by:  Papers (41)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    PbI2 detectors fabricated starting from samples either grown from the melt by the Bridgman method either from the vapour by the iodine assisted chemical transport method, have been tested for nuclear applications and compared each other in this respect. Values of (mobility) × (trapping times) product, μτ+, measured both for electrons and holes turn out to be one or two orders ... View full abstract»

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  • The Effects of Dislocations and Crystal Defects on the Energy Resolution and Response Uniformity of Mercuric Iodide Detectors

    Publication Year: 1977, Page(s):129 - 134
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4046 KB)

    The energy resolution and response uniformity of HgI2 detectors to nuclear radiation depends strongly on dislocation density and distribution in the HgI2 crystal bulk. Several large planar detectors fabricated from the interiors of large single crystals verified this dependence. Scanning with collimated low-energy (6 keV) and medium-energy (60 keV) gamma-rays confirmed the association of poor reso... View full abstract»

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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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