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Giordanengo, S.; Donetti, M.; Garella, M.A.; Marchetto, F.; Alampi, G.; Ansarinejad, A.; Monaco, V.; Mucchi, M.; Pecka, I.A.; Peroni, C.; Sacchi, R.; Scalise, M.; Tomba, C.; Cirio, R.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 01/2013, Letnik: 698Journal Article
A new hadron-therapy facility implementing an active beam scanning technique has been developed at the Italian National Center of Oncological Hadron-therapy (CNAO). This paper presents the design and the characterization of the beam monitor detectors developed for the on-line monitoring and control of the dose delivered during a treatment at CNAO. The detectors are based on five parallel-plate transmission ionization chambers with either a single large electrode or electrodes segmented in 128 strips (strip chambers) and 32×32pixels (pixel chamber). The detectors are arranged in two independent boxes with an active area larger than 200×200mm2 and a total water equivalent thickness along the beam path of about 0.9mm. A custom front-end chip with 64 channels converts the integrated ionization channels without dead-time. The detectors were tested at the clinical proton beam facility of the Paul Scherrer Institut (PSI) which implements a spot scanning technique, each spot being characterized by a predefined number of protons delivered with a pencil beam in a specified point of the irradiation field. The short-term instability was measured by delivering several identical spots in a time interval of few tenths of seconds and is found to be lower than 0.3%. The non-uniformity, measured by delivering sequences of spots in different points of the detector surface, results to be lower than 1% in the single electrode chambers and lower than 1.5% in the strip and pixel chambers, reducing to less than 0.5% and 1% in the restricted 100×100mm2 central area of the detector.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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