Characterizing the Time- and Energy-Dependent Reactor n/γ Environment

    Volume 3, Issue 8 (September 2006)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Page Count: 13


    Griffin, PJ
    Distinguished Member of the Technical Staff, Applied Nuclear Technologies, Sandia National Laboratories, Albuquerque, NM

    Luker, SM
    Senior Member of the Technical Staff, Applied Nuclear Technologies, Sandia National Laboratories, Albuquerque, NM

    King, DB
    Principal Member of the Technical Staff, Advanced Nuclear Concepts, Sandia National Laboratories, Albuquerque, NM

    DePriest, KR
    Senior Member of the Technical Staff, Applied Nuclear Technologies, Sandia National Laboratories, Albuquerque, NM

    Cooper, PJ
    Principal Member of the Technical Staff, Applied Nuclear Technologies, Sandia National Laboratories, Albuquerque, NM

    (Received 20 June 2005; accepted 24 May 2006)

    Abstract

    In a reactor pulse, the early radiation has a neutron/gamma component resulting from the prompt fission neutron and gamma radiation and from the neutron-induced secondary gammas. However, after the primary reactor pulse, the radiation environment also includes a time-dependent delayed neutron and gamma component. At even later times, the material activation dominates the source term. When active tests are conducted in the reactor, the radiation environment at a particular time may not be well characterized by the time-integrated spectrum provided by the typical radiation transport calculations. This paper defines the steps that are required to adequately model the time- and energy-dependent radiation environment in the reactor environment. This paper also compares the time-dependent response from a range of active dosimeters in a reactor pulsed environment and shows how the n/γ mixed-field response for the dosimeters and the changing radiation field can influence the interpretation of the dosimetry.


    Paper ID: JAI100361

    DOI: 10.1520/JAI100361

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    Author
    Title Characterizing the Time- and Energy-Dependent Reactor n/γ Environment
    Symposium Reactor Dosimetry, 12th International Symposium, 2005-05-13
    Committee E10