Radiation SensorsRadiation sensors utilize radiations (X-rays or gamma rays)for imaging and treatment in a variety of biomedicalapplications. In particular, radiation sensors are mostlyemployed for medical imaging while using ionising radiation.However, there are effects of ionising radiation on health. Toovercome danger of ionising radiation, a clear understanding ofthe benefits and risks associated with radiation andradioactivity are needed. Currently, medical imaging arecategorized into three categories based on the ionisingradiation.