3D-Mesa “Bridge” Silicon Microdosimeter: Charge Collection Study and Application to RBE Studies in Radiation Therapy


Microdosimetry is an very useful technique, used for dosimetry in unknown mixed radiation fields typical of area and aviation, as well as in hadron therapy. A replacement silicon microdosimeter with 3D sensitive volumes has been proposed to beat the shortcomings of the traditional Tissue Equivalent Proportional Counter. In this text, the charge collection characteristics of a replacement 3D mesa microdosimeter were investigated using the ANSTO heavy ion microprobe utilizing five.five MeV He2+ and a couple of MeV H+ ions. Measurement of the microdosimetric characteristics allowed for the determination of the Relative Biological Effectiveness of the 12C 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 smart agreement with the TEPC. The new 3D mesa “bridge” microdosimeter is a step forward towards a microdosimeter with absolutely free-standing 3D sensitive volumes.

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