International directory of certified radioactive materials / a joint undertaking by the IAEA's Analytical Quality Control Services and EURATOM's Central Bureau for Nuclear Measurements. International Atomic Energy Agency. Analytical Quality Control Services. European Atomic Energy Community. Central Bureau for Nuclear Measurements. Radioactive substances Catalogs. TK9401 .I54 546.4203 INI "STI/PUB/398". Includes bibliographical references. Vienna : International Atomic Energy Agency, 1975. 1975. 1975 Text 102 p. ; eng