title: Microdosimetric measurements in the thermal neutron irradiation facility of LENA reactor.
abstract: A twin TEPC with electric-field guard tubes has been constructed to be used to characterize the BNCT field of the irradiation facility of LENA reactor. One of the two mini TEPC was doped with 50ppm of (10)B in order to simulate the BNC events occurring in BNCT. By properly processing the two microdosimetric spectra, the gamma, neutron and BNC spectral components can be derived with good precision (~6%). However, direct measurements of (10)B in some doped plastic samples, which were used for constructing the cathode walls, point out the scarce accuracy of the nominal (10)B concentration value. The influence of the Boral(®) door, which closes the irradiation channel, has been measured. The gamma dose increases significantly (+51%) when the Boral(®) door is closed. The crypt-cell-regeneration weighting function has been used to measure the quality, namely the RBEµ value, of the radiation field in different conditions. The measured RBEµ values are only partially consistent with the RBE values of other BNCT facilities.
authors: INFN, Laboratori Nazionali di Legnaro, viale dell׳Università 2, I-35020 Legnaro, PD, Italy. Electronic address: paolo.colautti@lnl.infn.it.
authors: P
authors: P
authors: Colautti
authors: INFN, Laboratori Nazionali di Legnaro, viale dell׳Università 2, I-35020 Legnaro, PD, Italy.
authors: D
authors: D
authors: Moro
authors: INFN, Laboratori Nazionali di Legnaro, viale dell׳Università 2, I-35020 Legnaro, PD, Italy; SCK.CEN, Boeretang 200, B-2400 Mol, Belgium.
authors: S
authors: S
authors: Chiriotti
authors: INFN, Laboratori Nazionali di Legnaro, viale dell׳Università 2, I-35020 Legnaro, PD, Italy.
authors: V
authors: V
authors: Conte
authors: INFN, Laboratori Nazionali di Legnaro, viale dell׳Università 2, I-35020 Legnaro, PD, Italy; Radiotherapy and Nuclear Medicine Unit, Istituto Oncologico Veneto, Padova, via Gattamelata 64, I-35128 Padova, Italy.
authors: L
authors: L
authors: Evangelista
authors: Department of Physics, University of Pavia, via Bassi 6, I-27100 Pavia, Italy; INFN, Section of Pavia, via Bassi 6, I-7100 Pavia, Italy.
authors: S
authors: S
authors: Altieri
authors: Department of Physics, University of Pavia, via Bassi 6, I-27100 Pavia, Italy; INFN, Section of Pavia, via Bassi 6, I-7100 Pavia, Italy.
authors: S
authors: S
authors: Bortolussi
authors: Department of Physics, University of Pavia, via Bassi 6, I-27100 Pavia, Italy; INFN, Section of Pavia, via Bassi 6, I-7100 Pavia, Italy.
authors: N
authors: N
authors: Protti
authors: Department of Physics, University of Pavia, via Bassi 6, I-27100 Pavia, Italy; INFN, Section of Pavia, via Bassi 6, I-7100 Pavia, Italy.
authors: I
authors: I
authors: Postuma
mesh_terms: D001895:Boron / Q000032:analysis*; D016754:Boron Neutron Capture Therapy / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005720:Gamma Rays; D007554:Isotopes / Q000032:analysis; D009502:Neutrons; D009688:Nuclear Reactors / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D007554:Isotopes; D001895:Boron
keywords: BNCT; Microdosimetry; Twin TEPC