EVIDOS ("Evaluation of Individual Dosimetry in Mixed Neutron and Photon Radiation Fields")is an 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 which 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 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.
This work has been done with the collaboration of National Radiological Protection Board, Chilton, Didcot OX11 0RQ, UK, Paul Scherrer Institut, CH-5232 Villigen, Switzerland, Studiecentrum voor Kernenergie- Centre d'étude de l'énergie nucléaire, B-2400 Mol, Belgium, Dipartimento di Ingegneria Meccanica, Nucleare e della Produzione, I-56126 Pisa, Italy, Statens strålskyddsinstitut, SE-171 -16 Stockholm, Sweden, Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany, Kernkraftwerk Krümmel GmbH, D-21502 Geesthacht, Germany.