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    STP457

    Neutron Dosimetry for Fast-Reactor Irradiation and Surveillance Testing

    Published: Jan 1969


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    Abstract

    Dosimetry for fast-reactor irradiation experiments introduces problems not encountered in thermal reactors. The difference in neutron spectrum causes quite different responses among candidate dosimetry materials. Moreover, the damage modes in fast-reactor irradiations and in thermal reactor irradiations may be quite different. This work is aimed at developing adequate methods for spectral determinations, neutron dosimetry, and damage correlation for fast-reactor tests.

    Spectral determinations have been performed using a multiple foil activation technique (SAND-II). The SAND-II analysis provides integral neutron flux data with an absolute accuracy of 10 to 30 percent. Intercomparison of analytical results, neutron spectrometer results, and SAND-II determinations indicate reasonable agreement among all three techniques.

    While the SAND-II technique provides fluence data, threshold and resonance monitors are simpler to use. A slight modification of monitoring procedures used in thermal reactors suffices for fast-reactor dosimetry. Results from activation monitors in EBR-II and ECEL indicate the feasibility of the monitoring methods.

    Damage correlation techniques depend on the mechanisms causing damage. Two of the mechanisms causing property changes during fast-reactor irradiations are displacement production and helium generation by neutron reactions. The fluence dependence for these mechanisms illustrate the need for correlation analyses.

    Keywords:

    radiation effects, neutrons, irradiations, reactors, neutron dosimetry, neutron spectra, tests, evaluation


    Author Information:

    Yoshikawa, H. H.
    Unit Manager and Research Associate, Battelle Memorial Institute, Pacific Northwest Laboratory, Richland, Wash.

    McElroy, W. N.
    Unit Manager and Research Associate, Battelle Memorial Institute, Pacific Northwest Laboratory, Richland, Wash.


    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP41856S


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