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Nuclear Science, IEEE Transactions on

Issue 1  Part 2 • Date Feb 2001

 This issue contains several parts.Go to:  Part 1 

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Displaying Results 1 - 6 of 6
  • Annual review of the editorial process: statistics on contributed papers

    Publication Year: 2001 , Page(s): 141 - 143
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • List of the reviewers for 2000

    Publication Year: 2001 , Page(s): 176 - 177
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    Freely Available from IEEE
  • Design and performance of a data acquisition system for VUB-PET

    Publication Year: 2001 , Page(s): 150 - 156
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    A flexible and high-speed VME-based data acquisition system (DAQ) has been designed to process data from the University of Brussels (VUB) small-animal positron emission tomography (PET) system. The core tasks of the system are performed by two custom VME modules: a trigger module and a fast readout module (FRO). Following the detection of a valid coincidence event by the trigger unit, the raw data from all analog-to-digital converter channels involved are read out simultaneously via a FRO. An onboard digital signal processor (DSP) processor checks and calibrates these data. To increase the transfer throughput of the list mode data to a SUN Ultra Sparc 1 workstation, the DSP processor compresses the data format to a 6-byte data packet per event. The maximum average sustained acquisition rate of the system is 200000 counts per second (cps), while peak rates up to 2 Mcps can be handled. The DAQ also provides online measurement of the random event rate, the single event rate and event losses due to electronic dead time View full abstract»

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  • Observation of scattering and absorption centers in lead fluoride crystals

    Publication Year: 2001 , Page(s): 144 - 149
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (112 KB) |  | HTML iconHTML  

    For the first time, lead fluoride is used as a fast and compact material in electromagnetic calorimetry. Excellent optical and mechanical properties of the pure Cherenkov crystals are necessary for the A4 Collaboration to perform a measurement of the nucleon's strange form factors. Visible scattering and absorption centers as well as surface damages have been investigated to characterize the quality of more than one thousand crystals. Besides, transmittance measurements have been performed on all crystals to reveal absorption bands produced by intrinsic or impurity related point-structure defects. As a consequence, 89 crystals had to be replaced by the Chinese manufacturer SICCAS View full abstract»

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  • Effects of secondary particles on the total dose and the displacement damage in space proton environments

    Publication Year: 2001 , Page(s): 162 - 175
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB) |  | HTML iconHTML  

    MCNPX, a powerful Monte Carlo charged particle transport code, is introduced in this paper for space-radiation effect applications. By using MCNPX version 2.1.5, the enhancement of the total dose and the displacement damage due to secondary particles generated by the protons in the typical space radiation environments was assessed, then the results were compared to those obtained by the continuous slowing down approximation (CSDA) method. The comparison showed that the effects of the secondary particles were up to +7% for the total dose and up to +25% for the displacement damage when compared to the respective CSDA results in heavy shielding applications where trapped and solar protons dominate. Also presented in this paper is a method to compute the neutron/proton displacement cross sections by using MCNPX. The cross sections obtained show an excellent agreement with previously published values View full abstract»

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  • A positron floodlight for PET attenuation measurements

    Publication Year: 2001 , Page(s): 157 - 161
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (88 KB) |  | HTML iconHTML  

    A new technique to image the patient surface has been developed to assist in the segmented attenuation correction, currently finding favor in positron emission tomography (PET). The goals of this approach are to outline the body's contours quickly, with an inherent surface enhancement that would permit transmission scanning after the emission scan. To achieve this, an orbiting, thin-windowed source, mounted out of the detector plane, illuminates the patient's skin with a soft positron flux, while a static emission scan quickly delineates the patient outline. The ability to visualize internal structures is a welcome, if unexpected, windfall. The measurements of resolution and sensitivity cover a grid of three positron radionuclides and two source assemblies imaging several phantoms to challenge four commercial scanners. Currently mounted on a CTI 933/04, the positron floodlight is well suited to virtually any ring-array PET scanner, with the potential for adaptation to the dual-headed camera instruments emerging on the market today 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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