Abstract: Personal dose monitoring and environmental radiation monitoring are commonly conducted in places such as nuclear power plant reactor operations and nuclear medical facilities, often using thermoluminescent dosimeters (TLD). However, conventional devices like TLDs suffer from limitations in terms of real-time capability and readout convenience. To address the requirements of environmental and personal dose monitoring, this study carries out simulation research and experimental testing on a novel type of direct ion storage (DIS) dosimeter. A comprehensive simulation model is established through Monte Carlo simulations and technology computer-aided design (TCAD) for semiconductor process and device simulation. Combined with existing dosimeters, dosimetric characteristic tests are performed in radiation fields. As a result, a general simulation model for the DIS detector is developed, the overall structural parameters are designed, and a quantitative relationship between radiation dose and drain current is established. Based on the simulation results, compensation optimization of the existing dosimeter is performed using 1.6 mm PMMA or 1 mm aluminum, improving the energy response within the test range from ±30% to within ±20%. This study provides theoretical and technical support for further development of DIS dosimeters and serves as a reference for the research and application of novel DIS detectors.