Microdosimetric measurements in the thermal neutron irradiation facility of LENA reactor |
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| Institution: | 1. INFN, Laboratori Nazionali di Legnaro, viale dell?Università 2, I-35020 Legnaro, PD, Italy;2. SCK.CEN, Boeretang 200, B-2400 Mol, Belgium;3. Radiotherapy and Nuclear Medicine Unit, Istituto Oncologico Veneto, Padova, via Gattamelata 64, I-35128 Padova, Italy;4. Department of Physics, University of Pavia, via Bassi 6, I-27100 Pavia, Italy;5. INFN, Section of Pavia, via Bassi 6, I-7100 Pavia, Italy;1. Center of Medical Education, Sapporo Medical University, Sapporo, 060-8556, Japan;2. Research Reactor Institute, Kyoto University, Kumatori, 590-0494, Japan;3. Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan;1. Proton Medical Research Centre, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan;2. Department of Neurosurgery, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan;3. High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;4. Laboratory of Quantum Beam System, Hokkaido University, Sapporo, Hokkaido 060-0808, Japan;5. J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;1. INFN – LNF, Via E. Fermi n.40, Frascati, 00044 Roma, Italy;2. INAIL – DIT, Via di Fontana Candida n.1, 00040 Monteporzio Catone, Italy;3. Politecnico di Milano, Dipartimento di Energia, Via La Masa 34, 20156 Milano, Italy;4. INFN – Milano, Via Celoria16, 20133 Milano, Italy;5. ENEA Casaccia, Via Anguillarese, 301, S. Maria di Galeria, 00123 Roma, Italy;6. Laboratory of Medical Physics, Regina Elena National Cancer Institute, Via E. Chianesi 53, 00144 Roma, Italy;7. Department of Medical Physics, Azienda Ospedaliera San Camillo Forlanini, Circonvallazione Gianicolense 87, 00152 Roma, Italy;8. CIEMAT, Av. Complutense 40, 28040 Madrid, Spain;1. Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871, Japan;2. Radiation Research Center, Osaka Prefecture University, Gakuen-cho 1-1, Nakaku, Sakai, Osaka 599-8531, Japan;3. Department of Oral and Maxillofacial Surgery II, Graduate School of Dentistry, Osaka University, Yamada-oka 1-8, Suita, Osaka 565-0871, Japan |
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| 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 50 ppm of 10B 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 10B in some doped plastic samples, which were used for constructing the cathode walls, point out the scarce accuracy of the nominal 10B 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. |
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| Keywords: | Microdosimetry BNCT Twin TEPC |
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