The book "Röntgen Equivalent Man" offers a comprehensive analysis of the X-ray equivalent in humans and other mammals. It discusses the historical development and application of the X-ray equivalent, also known as rem, as a unit of measurement for radiation dose. The content is primarily based on articles from Wikipedia and other free online sources, providing a broad overview of the topic. The book explains the calculation of the X-ray equivalent, the significance of the weighting factor for biological damage caused by radiation, and the health effects of various radiation doses. It is a valuable reference work for professionals and anyone interested in radiation protection and the biological effects of radiation.