Development of semiconductor microdosimetry for modern radiation oncology modalities and radiation protection

Full text: This work is a first comprehensive investigation of the issues confronting silicon microdosimetry and its application for radiotherapy. New dosimeters based on silicon-on-insulator (SOI) device will be studied. Four main problems requiring investigation and comparison with spherical gas proportional microdosimeter are identified and addressed including shape of sensitive volume, tissue equivalence, noise minimization and sensitive volume definition. Experiments have been carried out with low noise prototypes of SOI microdosimeter at fast neutron therapy, on reactor and accelerator based BNCT and proton therapy facilities in the USA and Japan demonstrated great potential of new device