Cylindrical silicon-on-insulator microdosimeter: Charge collection characteristics

This study introduces and investigates a new silicon-on-insulator (SOI) microdosimeter with an array of 3D cylindrical micron sized sensitive volumes (SVs) for use in calculating the radiobiological effectiveness (RBE) of a radiation field via the microdosimetry approach. An ion beam induced charge (IBIC) study of individual SVs has revealed a well defined truly micron sized SV with a near 100 % charge collection efficiency (CCE). By eliminating cross talk between individual SVs, the device has the capability of studying the track structure of high energy, heavy ions like those found in a deep space environment.