Characterisation of silicon diode arrays for dosimetry in external beam radiation therapy

Authors

Claudiu S. Porumb, University of WollongongFollow
Abdullah H. Aldosari, University of WollongongFollow
Iolanda Fuduli, University of WollongongFollow
Dean L. Cutajar, University of WollongongFollow
Matthew Newall, University of WollongongFollow
Peter E. Metcalfe, University of WollongongFollow
Martin G. Carolan, Wollongong HospitalFollow
Michael L. F Lerch, University of WollongongFollow
Vladimir Perevertaylo, SPA BIT
Anatoly B. Rosenfeld, University of WollongongFollow
Marco Petasecca, University of WollongongFollow

RIS ID

108615

Publication Details

Porumb, C. S., Aldosari, A. H., Fuduli, I., Cutajar, D., Newall, M., Metcalfe, P., Carolan, M., Lerch, M. L. F., Perevertaylo, V. L., Rosenfeld, A. B. & Petasecca, M. (2016). Characterisation of silicon diode arrays for dosimetry in external beam radiation therapy. IEEE Transactions on Nuclear Science, 63 (3), 1808-1817.

Abstract

Modern stereotactic radiation therapy modalities utilize small beams and large dose gradients to deliver radiation in few fractions, reducing the possibility to correct for mistakes during the treatment process. Therefore, in order to ensure best possible treatment for the patient, quality assurance for such treatments necessitates a stable, linear, and sensitive radiation detector with high spatial resolution and radiation hardness. In this work, two silicon detector arrays with high spatial resolution have been characterized by 6 MV and 18 MV medical LINAC irradiation, and 5.5 MeV He2+ heavy ion microprobe. A maximum discrepancy of 0.6 mm in field size has been found when comparing to two-dimensional radiochromic film dose profile, and charge collection efficiency obtained by means of ion beam induced charge collection (IBICC) is 66% when operating the array in photovoltaic mode. Radiation damage study by photons and photoneutrons is presented.