Photon and neutron dose discrimination using low pressure proportional counters with graphite and A150 walls

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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.

Section: Characterisation Of Radiation Fieldsmentioning

confidence: 99%

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

Schuhmacher¹,

Bartlett²,

Bolognese-Milsztajn³

et al. 2006

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“…However, both detectors are well suited to determine the gamma H*(10) component and they were used as reference dosemeter for this component. The method used for separation of the neutron and photon dose-equivalent component has been reported earlier (7) . The second gamma survey instrument was a commercially available ionisation chamber.…”

Section: Instruments and Methodsmentioning

confidence: 99%

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

Lindborg

Bolognese-Milsztajn

Boschung

et al. 2007

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Ratios of H p (10) and H*(10) were determined with reference instruments in a number of workplace fields within the nuclear industry and used to derive workplace-specific correction factors. When commercial survey meter results together with these factors were applied to the results of the locally used personal dosemeters their results improved and became within 0.7 and 1.7 of the reference values or better depending on the response of the survey meter. A similar result was obtained when a correction was determined with a prototype reference instrument for H p (10) after adjustment of its response. Commercially available survey instruments both for photon and neutron H*(10) measurements agreed with the reference instruments in most cases to within 0.5-1.5. Those conclusions are derived from results reported within the EC supported EVIDOS contract.

“…Unfortunately, there are not detailed energy and angle dependence of response data available for the LB6411 or WENDI-II, which will limit this aspect of the analysis. There are, however, detailed data available for the Studsvik 2202D and for a different model of the Leake design, the 0949 (2) : these data show that the angle dependence is less important than the energy dependence of response, except when the instrument is exposed through its electronics. In real workplaces, with significant scatter, this will always account for a component of the field, but when used wisely, it should not constitute a very significant fraction of the field.…”

Section: Response Of Survey Instrumentsmentioning

confidence: 99%

“…One such system, and its results in the EVIDOS project, is discussed elsewhere in these proceedings (2) .…”

Section: Introductionmentioning

confidence: 99%

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Neutron area survey instrument measurements in the EVIDOS project

Tanner¹,

Bolognese-Milsztajn²,

Boschung³

et al. 2006

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Neutron survey instruments have been exposed at all the measurement locations used in the EVIDOS project. These results have an important impact in the interpretation of the results from the project, since operationally the survey instrument will be used for an initial assessment of and routine monitoring of the ambient dose equivalent dose rate. Additionally, since the response of these instruments is in some cases very well characterised, their systematic deviations from the reference quantities provide an important verification of the determination of those quantities.