The latest theories and results on the early effects of radiation on DNA are presented and summarized in this text. Contributions are made by leading radiation physicists, chemists and biologists. All three subject areas have shown great advances in recent years, for example, the computer codes and Monte Carlo calculations used by physicists, the deeper understanding of free radical intermediates by chemists, and the techniques of molecular biology. The reader will gain an insight into the different scientific languages and approaches used by physicists, chemists and biologists in the understanding of the effects of radiation on living matter. This book of proceedings on radiation biology, radiation chemistry and radiation physics is intended for researchers and advanced students.