Workplace Radiation Field Analysis

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Abstract
EURADOS working groups carried out comparison exercises with spectrometers and dosemeters in order to specify the mixed radiation fields at workplaces in nuclear facilities and in practical calibration fields. Carefully specified Bonner sphere spectrometers proved to be best suited to the determination of integral fluence and dose equivalent reference values with uncertainties smaller than 5% and 15%, respectively. Irradiations of personal dosemeters symmetrically mounted on phantoms allowed the directional spectral fluence to be evaluated and ambient and limiting dose equivalent values to be estimated. The readings of commonly used neutron monitors, moderator-type dosemeters and tissue-equivalent proportional counters also showed the rather large deviations from the reference values expected according to their response functions. A survey meter and superheated drop detectors recently developed seem to be better suited for neutron dosimetry in fields with a rather soft energy spectrum. Spectrometry and dosimetry in mixed fields are not as advanced as for neutrons.

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