Measurement of neutron spectra generated by a 62 AMeV carbon-ion beam on a PMMA phantom using extended range Bonner sphere spectrometers

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• 作者：R. Bedogni^a ; ^{roberto.bedogni@lnf.infn.it} ; K. Amgarou^b ; C. Domingo^b ; S. Russo^c ; G.A.P. Cirrone^c ; M. Pelliccioni^a ; A. Esposito^a ; A. Pola^d ; M.V. Introini^d ; A. Gentile^a
• 关键词：Hadron therapy ; Neutron spectrometry ; Bonner sphere spectrometer ; Unfolding ; FRUIT
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2012
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：21 July, 2012
• 卷：681
• 期：Complete
• 页码：110-115
• 文件大小：726 K

摘要

Neutrons constitute an important component of the radiation environment in hadron therapy accelerators. Their energy distribution may span from thermal up to hundred of MeV. The characterization of these fields in terms of dosimetric or spectrometric quantities is crucial for either the patient protection or the facility design aspects. To date, the Extended Range Bonner Sphere Spectrometer (ERBSS) is the only instrument able to simultaneously determine all spectral components in such workplaces. With the aim of providing useful data to the scientific community involved in neutron measurements at hadron therapy facilities, a measurement campaign was carried out at the Centro di AdroTerapia e Applicazioni Nucleari Avanzate (CATANA) of INFN-LNS (Laboratori Nazionali del Sud), where a 62 AMeV carbon ion is available. The beam was directed towards a PMMA phantom, simulating the patient, and two neutron measurement points were established at 0掳 and 90掳 with respect to the beam-line. The ERBSSs of UAB (Universidad Aut贸noma de Barcelona-Grup de F铆sica de les Radiacions) and INFN (Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali di Frascati) were used to measure the resulting neutron fields. The two ERBSSs use different detectors and sphere diameters, and have been independently calibrated. The FRUIT code was used to unfold the results.