**The book "Radioactivity" by Ernest Rutherford** "Radioactivity" is the fundamental work of the famous physicist and Nobel laureate Ernest Rutherford, in which he examines the phenomena and properties of radioactive materials. The book became the first comprehensive guide to understanding the processes that occur in atoms during radiation. In his book, Rutherford reveals the basic patterns of radioactivity, gives examples of research and experiments he performed in this area. The author explains complex physical processes and the leading principles of the interaction of radioactive radiation with matter in an accessible language. "Radioactivity" is not only a scientific book, but also an important contribution to the development of modern physics, which contributed to further discoveries in the field of radioactive materials and nuclear physics.