Book "VI. About the possible sources of rhodon in the groundwater of the Leningrad region "is a unique study that immerses the reader in the world of geology and hydrology, revealing the secrets of groundwater and their impact on human health and the ecosystem of the region. Compiled by a team of authors, this work is the result of many years of research and observations that have revealed potential sources of rhodon radioactive gas formed as a result of the decay of uranium in the earth. On the pages of the book, the reader will find not only scientific facts and data, but also fascinating stories about how researchers studied the groundwater of the Leningrad region, what methods were used for analysis and what conclusions were made. The book covers a wide range of topics, including geochemistry, ecologists, and the impact of natural factors on human health. This makes it interesting not only for specialists in the field of science, but also for a wide audience interested in ecology and health. Who can like this book? First of all, it will be useful for students and graduate students studying geology, hydrology and ecology . It will also attract the attention of researchers working in the field of ecology and environmental protection, as well as anyone interested in the impact of natural factors on human health. In addition, the book will be of interest to residents of the Leningrad region, who want to learn more about their natural resources and their possible impact on health. The topics raised in the book are relevant and important for modern society. With a growing interest in ecology and health, the study of groundwater and its composition is becoming especially important. Rodon, as one of the natural elements, can have both positive and negative effects on human health. The book helps to understand how important it is to control the level of this gas in groundwater and what measures can be taken to minimize its impact. The style of the authors is distinguished by scientific rigor, but at the same time the availability of presentation. They use simple and understandable terms, which makes the material available to a wide audience. The team of authors includes both experienced scientists and young researchers, which gives the book freshness and dynamism. In their works you can see not only a deep understanding of the subject, but also a passion for exploring nature. If you are interested in such works as “Hydrology and ecology of groundwater” or “Environmental aspects of groundwater”, then this book will be a real find for you. It will not only expand your knowledge of the underground waters of the Leningrad region, but also help to better understand how natural resources affect our health and life in general. Finally, “VI. On the possible sources of rhodon in the groundwater of the Leningrad region "is not just a book, but a whole world in which everyone who is interested in nature and its impact on humans should immerse themselves. This study will be a useful tool for anyone who seeks to better understand the world around them and its secrets. Do not miss the opportunity to discover new horizons of knowledge and take a step towards conscious interaction with nature.