The recent publication "JRC Scientific Achievements" is a companion volume to annual reports published by the Joint Research Centre. It assembles the significant contributions to science and technology made by the JRC Institutes: - CBNM - The Central Bureau for Nuclear Measurements (Geel); - ITU - The Institute for Transuranium Elements (Karlsruhe); - IAM - The Institute for Advanced Materials (Petten & Ispra); - EI - The Environment Institute (Ispra); - IRSA - The Institute for Remote Sensing Applications (Ispra); - IST - The Institute for Safety technology (Ispra); - ISEI - The Institute for Systems Engineering and Informatics (Ispra); - IPTS - The Institute for Prospective Technological Studies (Ispra). These institutes undertake in-house research within the Framework Programmes of the European Community, provide support to the DirectoratesGeneral where scientific or technical expertise is needed, and perform scientific work under contract with outside organizations. The items in the present publication were chosen to demonstrate how the JRC uses its talents in various ways for the Framework Programme, for providing laboratory facilities in connection with the implementation of Community policies and for supplying prenormative R&D in technical areas where harmonization is becoming increasingly important. Research activities described in the present volume cover: - Basic research of wide application (for example, redefining the value of the Avogadro constant); - Research with applications of public interest (for example, fission products and nuclear safety); - Research of specific interest to industry (for example, improving allweather remote sensing); - Development of specialized instrumentation (for example, scanning nuclear microprobe facility).