A brief summary is given of some of the on-line services (mainly in Europe and the USA), user-friendly PC programs and CD ROMs available to search for, display and retrieve nuclear data:

— evaluated nuclear data files — include fission yields, nuclear structure, mass, radioactive decay and cross-section data,

— scientific works published recently in the literature — e g., NSR (Nuclear Science References, a computer file of indexed references maintained by NNDC, Brookhaven National Laboratory, USA); INIS (International Nuclear Information System) operated by the International Atomic Energy Agency, Vienna, Austria; references system for the NUBASE evaluation (Atomic Mass Data Centre, Orsay, France), with regular updates accessible through the Internet.

Each of these tools may be rapidly used by reactor physicists to access evaluated data (e. g., ENSDF, AME, NUBASE, ENDF/B and JEF), and by nuclear data evaluators as a source of information on new measurements. Such on-line services and PC programs are also extremely useful for research and educational purposes.

The list of accessible data libraries outlined below is not complete — there are numerous special purpose files dedicated to more specific applications that have not been included (e. g., NUCLEIDE — CD-ROM reference files of decay data for radiometrology (Be et al, 1996); BANDRRI — CD-ROM reference files of decay data for dosimetry applications (Los Arcos et al, 2000); CD-ROM containing gamma-ray spectrum catalogues based on the studies of Heath (1974), and expanded by Helmer et al (2000)). Many of these specialised data files can be applied to the needs of nuclear medicine, dosimetry and detector calibration, and are accessible through the Internet.