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    The Neutron Spectrum of NBS-1


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    A proposed set of photonuclear cross sections was used to calculate the neutron spectrum of a RaBe photoneutron source. The calculation used the gamma rays from 226Ra in equilibrium as a driver, transported the gamma rays through the materials of the source, calculated neutron production, and subsequent neutron scattering. The calculation produced 27 % more neutrons than measured, and predicted relatively more low-energy neutrons.


    calibration, neutron, NBS-1, spectrum, photoneutron

    Author Information:

    Heimbach, Craig R.
    Physicist, National Institute of Standards and Technology, Gaithersburg, MD

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP45434S