When an emergency such as a nuclear accident or radioactive material leakage occurs, a portable radiation detector is an important tool for emergency responders. It can quickly detect the radiation intensity and radiation type at the accident site and surrounding areas, providing key data for emergency decision-making. Emergency responders can determine the range of dangerous areas based on the test results, formulate personnel evacuation plans, and guide the implementation of protective measures. For example, in the Fukushima nuclear accident, rescuers used a large number of portable radiation detectors to grasp the radiation pollution situation in a timely manner, effectively carried out emergency rescue and personnel evacuation, and minimized the harm of nuclear accidents to personnel and the environment.