This Safety Requirements publication establishes requirements - on the basis of the safety objective and principles established in the Fundamental Safety Principles - for the protection of people and the environment from harmful effects of ionizing radiation and for the safety of radiation sources. The requirements are applicable to all facilities and activities that give rise to radiation risks. They apply to three categories of radiation exposure: occupational exposure, public exposure and medical exposure. The printed book is available in English only. The companion CD includes translations of the text into Arabic, Chinese, French, Russian and Spanish. The text of this Interim Edition has been submitted to potential sponsoring organizations for their approval. Following their decisions on its approval, it will be issued in a final edition as a jointly sponsored standard.This Interim Edition is reproduced directly from IAEA Board of Governors document GOV/2011/42 and has not been edited or typeset by the IAEA. Contents: 1. Introduction; 2. General requirements for protection and safety; 3. Planned exposure situations; 4. Emergency exposure situations; 5. Existing exposure situations; Schedule I: Exemption and clearance; Schedule II: Categories for sealed sources used in common practices; Schedule III: Dose limits for planned exposure situations; Schedule IV: Criteria for use in emergency preparedness and response; Annex: Generic criteria for protective actions and other response actions in emergency exposure situations to reduce the risk of stochastic effects.