STP1001

    Neutron Sensitivity of LiF Chip Gamma Dosimeters at Megagray Doses

    Published: Jan 1989


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    Abstract

    A lithium fluoride “chip” gamma dosimeter has been tested for neutron sensitivity by irradiation in the cavity fission neutron field at the NBS reactor. Previous neutron sensitivity tests of these crystals had been made only for the F color center, which saturates at gamma doses of about 0.1 MGy. The present work extends these neutron sensitivity checks to the M, R, and N color centers which are useful for gamma doses in the 0.1 to 10 MGy range. The useful range of these centers was extended by reducing the thickness of the crystal to 1 mm. All irradiations in the 60Co calibration irradiator were made using the same encapsulation as will be employed in ex-vessel cavity exposures at power plants.

    Keywords:

    lithium fluoride, dosimetry, absorbance, color center, spectrophotometer, gamma-ray, neutron, reactor, radiation


    Author Information:

    Gilliam, DM
    National Bureau of Standards, Gaithersburg, MD

    Hocken, DG
    National Bureau of Standards, Gaithersburg, MD

    Humphreys, JC
    National Bureau of Standards, Gaithersburg, MD

    Lamaze, GP
    National Bureau of Standards, Gaithersburg, MD


    Paper ID: STP10077S

    Committee/Subcommittee: E10.05

    DOI: 10.1520/STP10077S


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