With the development of society and science and technology, people have found one after another light, which has been applied in daily life and work. For example, X-ray screening can be used to detect some harmful substances. So, do you know anything about existing radiation, such as X-rays, alpha-rays, beta-rays, etc? Do you know the difference between them? Here we give a brief introduction, hoping to help you better understand radiation and its applications, such as X-ray screening.