Silicon detectors are used in many medical applications for particle tracking, X-ray medical imaging, gamma or X-ray spectrometry, among others. The development of new silicon detectors for specific physics areas leads to overcome technological challenges that means not only optimize the design, but also improve the micro-fabrication processes. A new design of a solid-state- detector based on silicon microfabrication is described in this work in order to create a novel microdosimeter. This microdosimeter improves the performance of existing microdosimeters using three-dimensional microfabrication technology development. The microdosimeter could help to obtain biophysical parameters necessary to elucidate the relative biological effectiveness in hadrontherapy as well as the equivalent dose of background radiations present in nuclear medicine, aerospace exploration, nuclear facilities, particle accelerator and aviation.