In the medical industry, portable radiation detectors are mainly used for radiation monitoring during radiopharmaceutical treatment and diagnosis. In the Department of Nuclear Medicine, doctors use radiopharmaceuticals for disease diagnosis and treatment of patients, such as thyroid function examination, tumor imaging, etc. In these processes, it is necessary to precisely control the dose of radiopharmaceuticals and monitor the radiation levels of patients and the surrounding environment to ensure the treatment effect and safety. Portable radiation detectors can help healthcare workers detect the activity of radiopharmaceuticals in real time, as well as conduct radiation protection monitoring of work areas and personnel during operation to avoid unnecessary radiation exposure and protect the health of both doctors and patients.