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Workplace characterization using spectrometry for reliable neutron dose assessment in mixed neutron photon field


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European IRPA congress, Florence, 8-11 October 2002 T. Bolognese- Milsztajn*, B. Asselineau*, C. Itié*, T. Lahaye* ,H. Muller*, P. Hertmann**, Y.Guibaud**, Ph. Crovisier***, J.E. Groetz**** * Institut de Radioprotection et de Sûreté Nucléaire. Département de Protection de la santé de l'Homme et de Dosimétrie. Service de Dosimétrie. Laboratoire d’études et de Recherches en Dosimétrie Externe. Centre d'Etudes de Fontenay-aux-Roses.BP17, 92262 Fontenay-aux-Roses Cedex France ** Electricité de France, Division Production Nucléaire, Site de Cap Ampère,1 place Pleyel, 93282 Saint-Denis France *** CEA/DSTA/SPR Centre de Valduc 21120 Is sur Tille France **** Laboratoire de Microanalyses Nucléaires Université de Franche-Comté 25030 Besançon cedex France

Résumé

External dose assessment for neutrons is still a difficult problem in several fields: nuclear industry, medical applications, industrial and research accelerators, aircrafts and space stations. Two examples of field characterizations using spectrometry are presented, which demonstrate that a better knowledge of neutron energy distributions and of neutron to photon ratio is fundamental for reliable dose evaluation. Actions to improve radiation protection may be proposed such as: better choice of dosemeters adapted and calibrated according to energy of the neutron field encountered, improved shielding and optimization of radiation protection practices and procedures.