Health Physics is a title in the new Cambridge Advanced Sciences series. It has been developed specifically for the new specifications for Advanced Level Physics for teaching from September 2000. Health Physics has been endorsed by OCR for use with the OCR Physics specification A. It provides full coverage of the Physics option module of the same name. In combination with other books in the series it provides full coverage of the Advanced Level specifications. Learning objectives are clearly defined, so that students know exactly what they need to learn. Self-assessment questions (with answers) and exam-style end-of-chapter exercises offer excellent opportunities for independent study. Chapter introductions and summaries provide the basis for structured revision. Student-friendly design make the science accessible to all.