3D-Mesa "Bridge" Silicon Microdosimeter: Charge Collection Study and Application to RBE Studies in C-12 Radiation Therapy

作者：Tran Linh T^*; Chartier Lachlan; Prokopovich Dale A; Reinhard Mark I; Petasecca Marco; Guatelli Susanna; Lerch Michael L F; Perevertaylo Vladimir L; Zaider Marco; Matsufuji Naruhiro; Jackson Michael; Nancarrow Mitchell; Rosenfeld Anatoly B

来源：IEEE Transactions on Nuclear Science, 2015, 62(2): 504-511.

DOI：10.1109/TNS.2015.2391102

• 3D mesa
• charge collection
• heavy ion therapy
• IBIC
• microdosimetry
• silicon microdosimeter

Microdosimetry 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 He2+ and 2 MeV H+ ions. Measurement of the microdosimetric characteristics allowed for the determination of the Relative Biological Effectiveness of the C-12 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.

• 出版日期2015-4
• 单位北京理工大学