STP1490

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

    Published: Jan 2007


      Format Pages Price  
    PDF Version (668K) 12 $25   ADD TO CART
    Complete Source PDF (20M) 12 $126   ADD TO CART


    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.

    Keywords:

    dosimeter, delayed gamma, PCD, active dosimetry, PIN, calorimeter, radiation rate, flux, activation, fluence rate, fission chamber, ionization chamber, SPND


    Author Information:

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

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

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

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

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


    Paper ID: STP45425S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP45425S


    CrossRef ASTM International is a member of CrossRef.