STP1001

    Observation of Pulsed Neutron Fields with Solid-State Track Recorders

    Published: Jan 1989


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    Abstract

    A device called “Der Spinner” has been developed and tested. Its purpose is to obtain time-dependent information on neutron fluence/spectra by using solid-state track recorders. It should prove particularly useful in fast neutron bursts such as occur in nuclear fusion reactors. In the present version of the device, a rotating drum with four strips of track recorder material, such as mica, are placed around the cylinder in the direction of rotation.The cylinder has a diameter of 7.62 cm (3.0 in.). It is rotated by a synchronous motor at an angular speed of 3600 rpm. Each mica strip rotates under a collimating slit system. An actinide deposit or foil is placed in contact with the slit. Fission fragments are collimated through slits of 0.2 and 0.5 mm in the tests made, giving efficiencies of 0.0298 and 0.0745, respectively. Static tests were made with a 252Cf source; dynamic tests were made at an accelerator used in the pulsed mode at the Lawrence Livermore National Laboratory. Time resolutions on the order of 25 μS were obtained for the 0.2 mm slit, and about 50 μS for the 0.5 mm slit.Tests are continuing to determine the precision with which absolute fission rates can be obtained. Rotation speeds and drum diameters can be varied to obtain time resolutions suitable for a variety of experiments.

    Keywords:

    time dependence, neutron fluence/spectra, absolute fission rates, nuclear fusion, neutron bursts, rotating device, collimation, time resolution


    Author Information:

    Roberts, JH
    Metrology Control Corporation, Richland, WA

    Gold, R
    Westinghouse Hanford Company, Richland, WA

    Preston, CC
    Westinghouse Hanford Company, Richland, WA

    McElroy, WN
    Westinghouse Hanford Company, Richland, WA

    Morgan, JF
    Lawrence Livermore National Laboratory, Livermore, CA

    Clark, D
    Lawrence Livermore National Laboratory, Livermore, CA

    Ramos, RA
    Lawrence Livermore National Laboratory, Livermore, CA

    Redhead, DL
    Lawrence Livermore National Laboratory, Livermore, CA


    Paper ID: STP10113S

    Committee/Subcommittee: E10.05

    DOI: 10.1520/STP10113S


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