MICRODOSIMETRIC STUDY AT THE CNAO ACTIVE-SCANNING CARBON-ION BEAM

Radiation Protection Dosimetry
P ColauttiM Ciocca

Abstract

The Italian National Centre for Oncological Hadrontherapy (CNAO) has been treating patients since 2011 with carbon-ion beams using the active-scanning modality. In such irradiation modality, the beam spot, which scans the treatment area, is characterised by very high particle-fluence rates (more than 105 s-1 mm-2). Moreover, the Bragg-peak is only ~1 mm-FWHM. Commercial tissue-equivalent proportional counters (TEPC), like the Far West Technologies LET-½, are large, hence they have limited capability to measure at high counting fluence rates. In this study we have used two home-made detectors, a mini-TEPC 0.81 mm2 in sensitive area and a silicon telescope 0.125 mm2 in sensitive area, to perform microdosimetric measurements in the therapeutic carbon-ion beam of CNAO. A monoenergetic carbon-ion beam of 189.5 ± 0.3 MeV/u scanning a 3 × 3 cm2 area has been used. Spectral differences are visible in the low y-value region, but the mean microdosimetric values, measured with the two detectors, result to be pretty consistent, as well as the microdosimetric spectra in the high y-value region.

References

Sep 1, 1978·The British Journal of Radiology·M R RajuJ B Robertson
Apr 23, 2004·Radiation Protection Dosimetry·L De NardoG Tornielli
Feb 16, 2006·Medical Physics·Satoru EndoKiyoshi Shizuma
Dec 17, 2010·Journal of Radiation Research·Yuki KaseNaruhiro Matsufuji
Jul 20, 2011·Acta Oncologica·Brita Singers SørensenNiels Bassler
May 7, 2015·Radiation Protection Dosimetry·S ChiriottiB Grosswendt

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Citations

May 23, 2019·Physics in Medicine and Biology·Hongyu ZhuHarald Paganetti
Dec 17, 2019·Physics in Medicine and Biology·D BolstA B Rosenfeld
Apr 9, 2020·Physics in Medicine and Biology·Juan Prieto-PenaCeleste Fleta

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