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    Proton Recoil Spectroscopy 400 Meters from a Fission Neutron Source

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    Neutron kerma and spectrum measurements have been made at the U.S. Army Pulse Radiation Facility (APRF) to 400m in an air-over-ground geometry from a fission neutron source and have been compared to Monte Carlo transport calculations. The neutron spectra measurements were made using a rotating neutron spectrometer. This spectrometer consists of four spherical proton-recoil detectors mounted on a common rotating base. Detector radius, gas composition, and pressure have been varied to allow sensitivity over a neutron range of 50 keV to 4.5 MeV. Neutron kerma was determined by using the Kerr soft-tissue kerma factors. Measured neutron kerma agreed with the calculated neutron kerma to within 5%. Comparisons with other neutron spectrometers such as NE213 and Bonner Spheres are presented and agreement between the different spectrometers is better than 20%.


    neutron spectroscopy, proton recoil, fission neutron, radiation transport

    Author Information:

    Stanka, MB
    Physical Scientist, Combat Systems Test Activity, STECS-NE Aberdeen Proving Ground, MD

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP15123S