Radioisotope and X-ray Spectral Methods, edited by H. N. Shumilovsky is an important work that immerses the reader in the world of modern methods of analysis and diagnosis based on the use of radioisotopes and X-ray radiation. This publication will become an indispensable assistant for students, graduate students, as well as specialists in the field of physics, chemistry, medicine and materials science. Author's team headed by N. N. Shumilovsky, includes experts with rich experience in their fields. Their joint efforts have made it possible to create a book that not only deeply reveals the theoretical aspects of the methods, but also offers practical recommendations for their application. The reader will find here both basic concepts and complex techniques, which makes the book useful for both beginners and experienced professionals. The book focuses on two key methods: radioisotope and X-ray spectrometry. These technologies are widely used in various fields, from medicine to geology and materials science. The book explains in detail how radioisotopes are used to diagnose diseases, including in nuclear medicine, as well as how X-ray spectroscopic methods help in analyzing the composition of materials and investigating their properties. Each chapter is filled with examples from practice, which allows the reader to see how theoretical knowledge is applied in real-life situations. The topics raised in the book concern not only scientific aspects, but also ethical issues related to the use of radioactive materials. The authors discuss the safety of working with radioisotopes, as well as the need to comply with standards and norms, which makes the book relevant for specialists working in this field. This publication not only educates, but also encourages reflection on the importance of a responsible approach to scientific research. The book "Radioisotope and X-ray Spectral Methods" will be of interest not only to students and teachers, but also to practicing doctors, engineers and researchers working in the field of physics and medicine. It will be a useful resource for those who want to deepen their knowledge of modern methods of analysis and their application in various industries. Style N. N. Shumilovsky and his team are distinguished by clarity and accessibility of presentation, which allows the reader to easily assimilate even the most complex concepts. There are many illustrations and diagrams in the book that help to visualize the material and make it more understandable. This quality makes the publication particularly valuable for visual learners. The book may also be of interest to those who are looking for information about new trends in analysis and diagnosis. Readers interested in topics such as nuclear medicine, radiation safety, as well as the latest technology in the field of materials science, will find in this edition a lot of useful information. Do not miss the opportunity to immerse yourself in the fascinating world of radioisotope and X-ray spectral methods that open new horizons in science and medicine. Book N. N. Shumilovsky and his colleagues are not just a textbook, but a real find for everyone who aspires to be at the forefront of scientific discoveries and innovations.