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Nuclear Science, IEEE Transactions on

Issue 2 • Date April 1985

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Displaying Results 1 - 11 of 11
  • [Front cover]

    Publication Year: 1985 , Page(s): c1
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  • IEEE Transactions on Nuclear Science

    Publication Year: 1985 , Page(s): c2
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  • Effect of Irradiation on Crystal Defects in Quartz

    Publication Year: 1985 , Page(s): 1169 - 1179
    Cited by:  Papers (2)
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    X-and ¿-irradiation characteristics of optically non-clear natural quartz and electronic grade synthetic crystals have been investigated. In particular, it has been shown how, due to relatively large concentration of crystal imperfections in non-clear natural quartz, a positive frequency shift of crystal resonator on extended irradiation, increased smoky coloration, broad and sharp ESR signals observable at room temperature and increased intensity of thermoluminescence are produced compared to the corresponding characteristics of optically clear quartz crystals. It has been shown, how by increasing the imperfections in non-clear natural quartz still further by neutron irradiation, the frequency characteristics of natural quartz crystals would simulate those of the electronic grade synthetic crystals, and viceversa, by thermal annealing of the latter. Based on the appropriate thermal annealing of electronic grade synthetic crystals, the investigations yield a new way of achieving the much desired radiation hardening of quartz resonators used in satellite-borne frequency standards for space communication. View full abstract»

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  • A New Oftimal Control Strategy for a Nuclear Boiling Water Reactor

    Publication Year: 1985 , Page(s): 1180 - 1189
    Cited by:  Papers (1)
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    Application of optimal control theory to a boiling water nuclear reactor is the theme of this paper. The nonlinear model of the direct cycle 159 MW (th) Big Rock Point boiling water reactor derived on the basis of physicaL laws and empirical relations is linearized around an operating point and the model is verified against experimental results. The optimal control problem of the linearized model is treated as a regulator problem wherein the given quadratic index of performance includling a sensitivity term is minimized in an average sense over a set of feedback gain matrices which ensure prescribed closed-loop eigenvalues. An efficient computational procedure based on direct cost optimization using a gradient type algorithm is also reported. With the new optimal control strategy proposed in this paper, the stability and sensitivity characteristics of the system response can easily be manipulated. View full abstract»

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  • An Efficient Algorithm for Reconsiruction of SPECT Images in the Presence of Spatially Varying Attenuation

    Publication Year: 1985 , Page(s): 1190 - 1197
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4002 KB)  

    An algorithm is presented which permits the reconstruction of SPECT images in the presence of spatially varying attenuation. The algorithm considers the spatially variant attenuation as a perturbation of the constant attenuation case and computes a reconstructed image and a correction image to estimate the effects of this perturbation. The corrected image will be computed from these two images and is of comparable quality both visually and quantitatively to those simulated for zero or constant attenuation taken as standard reference images. In addition, the algorithm is time efficient, in that the time required is approximately 2.5 times that for a standard convolution-back projection algorithm. View full abstract»

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  • Electron Beam Simulation of Pulsed Photon Effects in Electronic Devices at Very High Doses and Dose Rates

    Publication Year: 1985 , Page(s): 1198 - 1203
    Cited by:  Papers (1)
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    Large high-energy flash X-ray simulation facilities are expensive to build and operate. As a result, the radiation effects community has at it's disposal a limited number of X-ray sources with the capability of providing the very high levels of radiation (hundreds of k rad(Si)) required for R and D. Because of the inefficiency of bremsstrahlung production, an accelerator which provides only small doses in the X-ray mode could readily provide the very high total doses and associated dose rates via direct electron irradiation. A prerequisite for electron beam testing is a satisfactory demonstration of the fidelity of the simulation. This paper presents the experimental details and results of such an assessment. It was demonstrated in this work that electron beams do simulate the effects of high-energy bremsstrahlung X-rays when testing semiconductor devices for very high dose and dose rate effects. However, it was also found that the effects of charge deposition from the electron beam can dramatically perturb the nominal irradiation bias conditions. In electronic devices where radiation induced degradation is a function of applied potentials (e.g., MOS devices), this charge capture can totally invalidate the simulation unless the experimenter is aware of and compensates for the effect. View full abstract»

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  • Semiconductor Drift Chambers

    Publication Year: 1985 , Page(s): 1204 - 1208
    Cited by:  Papers (4)
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    First Page of the Article
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  • Performance of Fuel Failure Detection System for Coated Particle Fuels

    Publication Year: 1985 , Page(s): 1209 - 1213-a
    Cited by:  Papers (3)
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    An experimental system was developed for a study of fuel failure detection (FFD) method for coated particle fuels (CPF's) of a high-temperature gas-cooled reactor. Various performances of the FFD-system were examined using a CPF-irradiation rig in the Japan Material Testing Reactor. By experiments, it was made sure that the counting rates of fission products (FP's), released from the CPF's, change with the reactor-power and the fuel-temperature remarkably even during the normal reactor operation. Also, an ability of the selective detection of only short-life FP-nuclides was studied in relation to the travelling time of the sampling gas. The results showed that the contributions of the short-life FP-nuclides such as Kr-89 and Kr-90 are more than 80 percent to the total FP-counting rate at the shortest travelling time of 120 sec. It is concluded that the selective detection of only the short-life FP-nuclides can be realized by controlling the travelling time properly. View full abstract»

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  • IEEE copyright form

    Publication Year: 1985 , Page(s): 1213-b - 1213-c
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  • Information for authors

    Publication Year: 1985 , Page(s): 1213d
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  • Affiliate Plan of the IEEE Nuclear and Plasma Sciences Society

    Publication Year: 1985 , Page(s): 1213-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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