The book is intended to help dissolving the feelings of helplessness and discomfiture among the population, by providing the information needed to avoid unnecessary worries, and to take the right decisions. The authors have collected the scientific knowledge available today of radioactive radiation and its effects on the biological environment and the human body. Taking into account the measured data and other insight obtained from previous accidents like the one at Seveso, e.g., or from the atmospheric nuclear weapons tests and the resulting fallout, the authors present advice and proposals that have been weighed with a view to a reasonable risk-benefit relation. The authors think that a well-informed person can today assess his own personal radiation risk after careful consideration of personal habits, and keep the radiation burden as low as possible. Apart from the variety of practical hints and advice given, the authors also discuss the confusion created by officials and authorities through their meager information policy, which finally led to the credibility gap in public opinion. The book is completed by an annex containing a survey of the Atomic Energy Laws, the Radiation Protection Ordinance, resolutions of the Strahlenschutzkommission (SSK), a literature index, and a comprehensive subject index.