3D-Mesa “Bridge” Silicon Microdosimeter: Charge Collection Study and Application to RBE Studies in $^{12}{\rm C}$ Radiation Therapy
2015; Institute of Electrical and Electronics Engineers; Volume: 62; Issue: 2 Linguagem: Inglês
10.1109/tns.2015.2391102
ISSN1558-1578
AutoresLinh T. Tran, Lachlan Chartier, Dale A. Prokopovich, Mark I. Reinhard, Marco Petasecca, Susanna Guatelli, Michael Lerch, Vladimir L. Perevertaylo, Marco Zaider, Naruhiro Matsufuji, Michael Jackson, Mitchell Nancarrow, Anatoly Rosenfeld,
Tópico(s)Radiation Detection and Scintillator Technologies
ResumoMicrodosimetry is an extremely useful technique, used for dosimetry in unknown mixed radiation fields typical of space and aviation, as well as in hadron therapy. A new silicon microdosimeter with 3D sensitive volumes has been proposed to overcome the shortcomings of the conventional Tissue Equivalent Proportional Counter. In this article, the charge collection characteristics of a new 3D mesa microdosimeter were investigated using the ANSTO heavy ion microprobe utilizing 5.5 MeV He 2+ and 2 MeV H + ions. Measurement of the microdosimetric characteristics allowed for the determination of the Relative Biological Effectiveness of the 12 C heavy ion therapy beam at the Heavy Ion Medical Accelerator in Chiba (HIMAC), Japan. Well-defined sensitive volumes of the 3D mesa microdosimeter have been observed and the microdosimetric RBE obtained showed good agreement with the TEPC. The new 3D mesa “bridge” microdosimeter is a step forward towards a microdosimeter with fully free-standing 3D sensitive volumes.
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