ABSTRACT
Within the EC project EVIDOS ('Evaluation of Individual Dosimetry in Mixed Neutron and Photon Radiation Fields'), different types of active neutron personal dosemeters (and some passive ones) were tested in workplace fields at nuclear installations in Europe. The results of the measurements which have been performed up to now are summarised and compared to our currently best estimates of the personal dose equivalent Hp(10). Under- and over-readings by more than a factor of two for the same dosemeter in different workplace fields indicate that in most cases the use of field-specific correction factors is required.
Subject(s)
Computer-Aided Design , Environmental Exposure/analysis , Radiation Monitoring/instrumentation , Radiation Protection/instrumentation , Equipment Design , Equipment Failure Analysis , Government Programs , Internationality , Neutrons , Photons , Radiation Dosage , Reproducibility of Results , Sensitivity and SpecificityABSTRACT
This work describes spectral distributions of neutrons obtained as function of energy and direction at four workplace fields at the Krümmel reactor in Germany. Values of personal dose equivalent H(p)(10) and effective dose E are determined for different directions of a person's orientation in these fields and readings of personal neutron dosemeters--especially electronic dosemeters--are discussed with respect to H(p)(10) and E.
Subject(s)
Neutrons , Nuclear Reactors , Occupational Exposure/analysis , Radiation Protection/methods , Thermoluminescent Dosimetry/instrumentation , Dose-Response Relationship, Radiation , Electronics , Equipment Design , Equipment Failure Analysis , Germany , Radiation Dosage , Reproducibility of Results , Semiconductors , Sensitivity and Specificity , Surface Properties , Thermoluminescent Dosimetry/methodsABSTRACT
EVIDOS ('evaluation of individual dosimetry in mixed neutron and photon radiation fields') is an European Commission (EC)-sponsored project that aims at a significant improvement of radiation protection dosimetry in mixed neutron/photon fields via spectrometric and dosimetric investigations in representative workplaces of the nuclear industry. In particular, new spectrometry methods are developed that provide the energy and direction distribution of the neutron fluence from which the reference dosimetric quantities are derived and compared to the readings of dosemeters. The final results of the project will be a comprehensive set of spectrometric and dosimetric data for the workplaces and an analysis of the performance of dosemeters, including novel electronic dosemeters. This paper gives an overview of the project and focuses on the results from measurements performed in calibration fields with broad energy distributions (simulated workplace fields) and on the first results from workplaces in the nuclear industry, inside a boiling water reactor and around a spent fuel transport cask.
