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Abstract

The reference material consists of a set of aluminium cans filled with U-3O-8 of 5 different 235-U to U abundances, ranging from 0.3 to 4.5 %. The material is intended to be applied for the non-destructive assay of the 235-U to U abundance in homogeneous uranium bulk material by gamma spectrometry, using the characteristic gamma radiation at 185.7 keV. For this purpose four parameters are specified in addition to the certified 235-U to U abundances: can window thickness, chemical purity of the U-3O-8, thickness of the U-3O-8 layer, and gamma emitting impurities. The report describes the preparation of the reference material, the characterization of the 235-U to U abundances by UF-6 and thermal ionization mass spectrometry, the homogeneity control tests and the specifications of the other characteristics, influencing highly accurate gamma spectrometric measurements. The certification procedure is briefly discussed. Initiated by ESARDA, the project was performed in close cooperation by CBNM and NBS. The reference material is issued in Europe by CBNM as EC NRM 171 and in the USA by NBS as SRM 969. The certified 235-U to U abundance values and the corresponding uncertainties are identical in the EC and the USA certificate. This joint action is a good example for the ideal approach of having important reference materials certified by specialized standard laboratories and on a very broad international scale.

Additional information

Authors: DE BIEVRE P, JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA);ESCHBACH H L, JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA);LESSER R, JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA);MEYER H, JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA);VAN AUDENHOVE J, JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA);CARPENTER B S JRC GEEL ESTAB. (BELGIUM), JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA), JRC GEEL ESTAB. (BELGIUM);NATIONAL BUREAU OF STANDARDS, GAITHERSBURG (USA)
Bibliographic Reference: INTERNATIONAL CONFERENCE ON ANALYTICAL CHEMISTRY IN NUCLEAR TECHNOLOGY, KARLSRUHE (GERMANY), JUNE 3-6, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32021 ORA
Availability: Can be ordered online
Record Number: 1989123069800 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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