Alpha radiation can cause intense ionization, but it is easily absorbed by, for example, a sheet of paper, protective clothing. Beta radiation can penetrate into body tissues to a depth of 1-2 cm. Like alpha radiation, it is absorbed, for example, by a plexiglass screen, a layer of aluminum several millimeters thick. Gamma radiation is the most dangerous for living organisms, as it has a high penetrating ability. This radiation can only be trapped by a thick lead or concrete slab.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.