| Zugriffsnummer | 11546 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | Determination of the neutron and photon dose equivalent at work places in cuclear facilities of Sweden : an SSI-EURADOS comparison exercise. Part 2: Evaluation |
| Autor(in); Institution |
Bartlett, David; National Radiological Protection Board (NRPB), Chilton, UK
Drake, Per; Vattenfall AB, Ringhals, Väröbacka, SWEDEN
Lindborg, Lennart; Swedish Radiation Protection Institute, Stockholm, SWEDEN
Klein, Horst; 6.4, Neutronenmetrologie, PTB-Braunschweig
Schmitz, Thomas; Forschungszentrum Jülich, Jülich, GERMANY
Tichy, M.; Institute for Radiation Dosimetry, Prague, CZECH REPUBLIC
|
| Quelle/Jahr | (1999), 92 S. |
| Schriftenreihe | SSI-Rapport: 99:13,2 |
| ISSN | 0282-4434 |
| Berichtsnummer | SSI 99 13 |
| Verlag | Stockholm: Ståtens Stralskyddinstitut |
| Freie Schlagworte | workplace fields ; spectrometry ; dosimetry ; comparison |
| Zusammenfassung | Various mixed neutron-photon fields at workplaces in the containment of pressurized water reactors and in the vicinity of transport containers with spent fuel elements were investigated with spectrometers and dosimeters. The comprehensive set of data obtained with multiphere spectrometers, tissue equivalent proportional counters and area and personal dosemeters for neutrons and photons was thoroughly evaluated. The spectral neutron fluences evaluated from measurements with up to 5 different multiphere systems for each position were finally recommended to be used for the calculation of dosimetric reference values for comparison with the readings of the dosemeters applied simultaneously. It turned out that most of the moderator based area dosemeters overestimated, while the TEPC systems generally underestimated the ambient dose equivalent (DE) values of the rather soft neutron fields encountered at these workplaces. The partially remarkable discrepancies can, however, be explained on the basis of well known energy dependent responses of the instruments used and the evaluated spectral neutron fluences. The ambient DE values obtained with recently developed area dosemeters based on superheated drop detectors and with track etch based personal dosemeters on phantoms, however, were in satisfying agreement with the reference data at all points of measurement investigated. Moreover, the sets of personal dosemeters simultaneously irradiated on a phantom allowed to roughly estimate the directional dependence of the neutron fluence. Hence, personal and limiting dose equivalent quantities could also be calculated. As a result the personal and ambient DE values were always conservative estimates of the limiting quantities. Unexpectedly, discrepancies were observed for photon DE data measured with GM counters and TEPC systems. The up to 50% higher readings of the GM counters may be explained by a considerable contribution of high energy photons to the total photon dose equivalent, but photon spectrometry is necessary for final clarification. |
| Rechteinformation | 1999, SSI |
Zitierung
Bartlett, D., Drake, P., Lindborg, L., Klein, H., Schmitz, T., & Tichy, M. (1999). Determination of the neutron and photon dose equivalent at work places in cuclear facilities of Sweden : an SSI-EURADOS comparison exercise. Part 2: Evaluation (Report No. SSI 99 13). Stockholm: Ståtens Stralskyddinstitut.