Evaluation of individual dosimetry in mixed neutron and photon radiation fields (EVIDOS). Part II: conclusions and recommendations

Abstract

7Swedish Radiation Protection Authority, SE-171-16 Stockholm, SwedenThe paper presents the main conclusions and recommendations derived from the EVIDOS project, which is supported by the European Commission within the 5th Framework Programme. EVIDOS aims at evaluating state of the art neutron dosimetry techniques in representative workplaces of the nuclear industry with complex mixed neutron-photon radiation fields. This analysis complements a series of individual papers which present detailed results and it summarises the main findings from a practical point of view. Conclusions and recommendations are given concerning characterisation of radiation fields, methods to derive radiation protection quantities and dosemeter results.

Application of workplace correction factors to dosemeter results for the assessment of personal doses at nuclear facilities

“…In total 17 different workplace fields were investigated. The measurement positions are described in detail elsewhere (6) . The fluence spectra and direction distributions can be found in other reports (4,6) .…”

“…The measurement positions are described in detail elsewhere (6) . The fluence spectra and direction distributions can be found in other reports (4,6) . The survey instruments used during the campaigns and the neutron personal dosemeters used locally are listed in Tables 1 and 2.…”

“…The second gamma survey instrument was a commercially available ionisation chamber. Details concerning calibration of the dosemeters are found in the main report (6) and in ref. 5.…”

“…The outcome of all dosemeter results was recently reported (5) and is only partly covered here. All measured results and detailed descriptions of measurement positions and instruments can be found in a PTB report (6) . In this paper, the reference values are used to derive workplace-specific correction factors, which could be used for workplace field calibrations.…”

Individual monitoring at accelerator centres

“…New concepts (40) , further improvements of detector materials, together with sophisticated converter materials, and evaluation procedures may remedy the existing constraints. Electronic neutron dosemeters are emerging on the market (32,41) . Their use may complement passive systems in various applications, but presumably not replace them.…”