IAEA internet database of natural matrix reference materials

The International Atomic Energy Agency maintains a database on internationa lly available certified reference materials of natural origin. The database was updated in 1998 and prepared for an Internet implementation. A user-fr iendly structure was created, providing two main pathways for browsing, eit her according to the matrix classification or the producer's name. The data base presently contains over 20,000 values for 480 measurands and 1085 refe rence materials from 43 different producers. Most of the materials entered contain values for trace and minor elements (66%).