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Secondary exposure for 73 and 200 MeV proton therapy


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Titre du congrès :IM 2005 - European Workshop on Individual Monitoring of Ionising Radiation
Ville du congrès :Vienne
Date du congrès :11/04/2005
Titre de la  revue : Radiation Protection Dosimetry Vol 125 issue 1-4 Pages : 349-354

Type de document > *Congrès/colloque

Mots clés >

Unité de recherche > IRSN/DRPH/SDE/LDRI

Auteurs > DELACROIX Sabine, PROUST J., TROMPIER François, VABRE I.

Date de publication > 01/07/2007

Résumé

Following modifications on the beam line at the Orsay Protontherapy Center, dose measurements were performed in order to make a dose map in the treatment rooms and in the delimited radiation-controlled area around beam line. Measurements were performed using tissue-equivalent proportional counters and rem-counters. Analysis of TEPC single event measurements showed that high LET components (>10 keV.µm-1) represent 90 to 99% of total dose equivalent in the treatment rooms and 50 to 90% in the controlled area and quality factors range, respectively between 2 and 15. A fast neutron component was identified in the treatment rooms, where dose equivalent rate varied between few µSv.h-1 to some dozen of mSv.h-1. In high-energy radiation field rem-counters underestimated TEPC values for neutron component. The variation between instruments response according to the location is linked to energetic spectrum variations and instrument characteristics.