Radiation Damage to Graphite From 30 C to 185 C

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Property changes in polycrystalline graphite resulting from reactor irradiations at temperatures up to 185 deg C and over a range of exposures up to 1135 Mwd/ CT have been determined. Changes in stored energy, thermal conductivity, sample length, and C/sub O/ interlayer crystallite spacing are markedly decreased as exposure temperature is increased. Electrical resistivity changes are also less at higher exposure temperatures, but this property change does not depend as strongly on temperature as the others. Isothermal annealing studies of C/sub O/ changes were conducted on a number of irradiated samples. The data were analyzed assuming a large number of ... continued below

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Pages: 22

Creation Information

Nightingale, R. E. & Fletcher, J. F. September 26, 1957.

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  • Hanford Atomic Products Operation
    Publisher Info: General Electric Co. Hanford Atomic Products Operation, Richland, Wash.
    Place of Publication: Richland, Washington

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Description

Property changes in polycrystalline graphite resulting from reactor irradiations at temperatures up to 185 deg C and over a range of exposures up to 1135 Mwd/ CT have been determined. Changes in stored energy, thermal conductivity, sample length, and C/sub O/ interlayer crystallite spacing are markedly decreased as exposure temperature is increased. Electrical resistivity changes are also less at higher exposure temperatures, but this property change does not depend as strongly on temperature as the others. Isothermal annealing studies of C/sub O/ changes were conducted on a number of irradiated samples. The data were analyzed assuming a large number of processes distributed in activation energy. The results are summarized in activation energy spectra in which the distribution of C/sub O/ damage is given as a function of the activation energy required for annealing. It is found that not only does a higher exposure temperature decrease the total amount of property change, but also the distributlon of damage accumulated is considerably different. Results are discussed in terms of the radiation damage model suggested by Hennig and Hove. This model is compatible with the experimental results presented. (auth)

Physical Description

Pages: 22

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NTIS

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  • Other Information: Orig. Receipt Date: 31-DEC-58

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  • Report No.: HW-47776(Rev.)
  • Grant Number: W-31-109-ENG-52
  • DOI: 10.2172/4343699 | External Link
  • Office of Scientific & Technical Information Report Number: 4343699
  • Archival Resource Key: ark:/67531/metadc1016944

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Creation Date

  • September 26, 1957

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

Description Last Updated

  • Dec. 20, 2017, 3:03 p.m.

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Nightingale, R. E. & Fletcher, J. F. Radiation Damage to Graphite From 30 C to 185 C, report, September 26, 1957; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1016944/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.