STP1001

    Measurements and Model Predictions for Improved Microcalorimeter Design

    Published: Jan 1989


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    Abstract

    Radiation absorbed dose microcalorimetry is a direct technique for energy deposition measurements in low power benchmark mixed neutron and gamma-ray radiation fields. MkII adiabatic microcalorimeters, developed at Imperial College, are described. The results of recent electrical calibration and 60Co gamma-ray field measurements are presented for graphite and iron microcalorimeters.

    In order to assess sources of error, a finite-difference conduction-heat-transfer computer code has been employed to model the microcalorimeter performance. Model predictions are in good agreement with experimental results.

    As a result of the error assessment, a redesigned MkV graphite microcalorimeter has been constructed, and results for electrical calibration and 60Co gamma-ray measurements are presented. Systematic errors are reduced by a factor of about 10 for electrical calibration. for the 60Co measurements, the discrepancy between the graphite MkV microcalorimeter and calibrated ionization chambers is less than 2%.

    Keywords:

    absorbed dose, microcalorimeter, energy deposition, heat transfer, control, thermocouple


    Author Information:

    Bainbridge, N
    Imperial College, Ascot, Berkshire,

    Mason, JA
    Imperial College, Ascot, Berkshire,

    Peerless, SJ
    Imperial College, London,


    Paper ID: STP10136S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP10136S


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