title: SECONDARY NEUTRON DOSES IN A PROTON THERAPY CENTRE.
abstract: The formation of secondary high-energy neutrons in proton therapy can be a concern for radiation protection of staff. In this joint intercomparative study (CERN, SCK•CEN and IBA/IRISIB/ULB), secondary neutron doses were assessed with different detectors in several positions in the Proton Therapy Centre, Essen (Germany). The ambient dose equivalent H(*)(10) was assessed with Berthold LB 6411, WENDI-2, tissue-equivalent proportional counter (TEPC) and Bonner spheres (BS). The personal dose equivalent Hp(10) was measured with two types of active detectors and with bubble detectors. Using spectral and basic angular information, the reference Hp(10) was estimated. Results concerning staff exposure show H(*)(10) doses between 0.5 and 1 nSv/monitoring unit in a technical room. The LB 6411 showed an underestimation of H(*)(10), while WENDI-2 and TEPC showed good agreement with the BS data. A large overestimation for Hp(10) was observed for the active personal dosemeters, while the bubble detectors showed only a slight overestimation.
authors.affiliation: Dosimetry and Calibration, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium mdsainth@sckcen.be.
authors.forename: M
authors.initials: M
authors.lastname: De Saint-Hubert
authors.affiliation: Dosimetry and Calibration, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium.
authors.forename: C
authors.initials: C
authors.lastname: Saldarriaga Vargas
authors.affiliation: Dosimetry and Calibration, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium.
authors.forename: O
authors.initials: O
authors.lastname: Van Hoey
authors.affiliation: Dosimetry and Calibration, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium.
authors.forename: W
authors.initials: W
authors.lastname: Schoonjans
authors.affiliation: Département Nucléaire, Institut de Recherche de l'Institut Supérieur Industriel de Bruxelles (IRISIB), Rue Royale 150, 1000 Bruxelles, Belgium Université Libre de Bruxelles, Inter-university Institute for High Energies (IIHE), Boulevard du Triomphe CP230, 1050 Bruxelles, Belgium.
authors.forename: V
authors.initials: V
authors.lastname: De Smet
authors.affiliation: Ion Beam Applications S.A., Chemin du Cyclotron 3, 1348 Louvain-la-Neuve, Belgium.
authors.forename: G
authors.initials: G
authors.lastname: Mathot
authors.affiliation: Ion Beam Applications S.A., Chemin du Cyclotron 3, 1348 Louvain-la-Neuve, Belgium.
authors.forename: F
authors.initials: F
authors.lastname: Stichelbaut
authors.affiliation: CERN, CH-1211 Geneva 23, Switzerland Department of Physics, University of Liverpool, L697ZE Liverpool, UK.
authors.forename: G
authors.initials: G
authors.lastname: Manessi
authors.affiliation: CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: N
authors.initials: N
authors.lastname: Dinar
authors.affiliation: CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Aza
authors.affiliation: Department of Energy, Politecnico of Milan, Via Ponzio 34/3, 20133 Milan, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Cassell
authors.affiliation: CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Silari
authors.affiliation: Dosimetry and Calibration, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium.
authors.forename: F
authors.initials: F
authors.lastname: Vanhavere
mesh_terms: D000465:Algorithms; D005858:Germany; D006801:Humans; D009010:Monte Carlo Method; D009502:Neutrons; D016273:Occupational Exposure / Q000032:analysis* / Q000517:prevention & control*; D019047:Phantoms, Imaging; D061766:Proton Therapy / Q000295:instrumentation* / Q000379:methods; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods