Gives 668 terms in French, English, Russian, German, Spanish, Italian, Dutch, Polish, Swedish with their definitions in French, English and Russian subdivided into the following sections: general terms, domains, subdivisions and personnel (23); ionizing radiation: types and properties (95), sources and interactions (56), quantities and units (65); radiological apparatus: X-ray sources and assemblies (52), radiation sources and particle accelerators (30), specifications and testing (22); auxiliary equipment: general (31), rediological diagnosis and therapy (33); radiological techniques: diagnosis (24), therapy (19); dosimetry: general terms, special quantities and units (54), radiation detectors and measuring devices (64); radiation protection: special*quantities and units (24), exposure of people (13), methods and monitoring (32), some biological effects of ionizing radiation (29). Terms are ordered by topics, indices in the above languages give the terms in alphabetic order.