STP1001

    Calibration Problems in the Direct Measurement of Radiation Absorbed Dose

    Published: Jan 1989


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    Abstract

    Radiation absorbed dose calorimetry is a direct method for measuring radiation energy deposition in a nuclear reactor environment. It is superior to indirect dosimetry methods, although the validity of the calorimetry technique is crucially dependent on the calibration procedures that are employed.

    In this paper calorimeter calibration methods and measurement procedures are critically examined. Calibration problems are considered in the context of three aspects of calorimetry measurements. The first is concerned with the compatibility of the dosimeter with the radiation field. Radiation disequilibrium can lead to significant measurement errors. Errors of instrumentation are then considered, and the problems of temperature stability and electronic noise are emphasized. The bulk of the paper is devoted to an examination of heat transfer aspects of the calibration problem. This area, which has sometimes been ignored, is considered in terms of heat transfer mechanisms and conditions that may lead to significant measurement errors. Calorimeter calibration problems are illustrated with examples from practical calorimetry measurements.

    Keywords:

    calorimetry, calibration, radiation absorbed dose, heat transfer, conduction, convection, radiation, control


    Author Information:

    Mason, JA
    Imperial College, Ascot, Berkshire,

    Bainbridge, N
    Imperial College, Ascot, Berkshire,

    Heffer, PJH
    CEGB, Berkeley Nuclear Laboratories, Berkeley, Gloucestershire,


    Paper ID: STP10095S

    Committee/Subcommittee: E10.05

    DOI: 10.1520/STP10095S


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