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Abstract

An accurate measurement of the plutonium mass is important for safeguard purposes. The use of Time Correlation Analysers (TCAs) present clear advantages in the assay of poorly characterized materials. However Time Correlation Analysis has to be carefully checked in field conditions to determine the actual performance of this method. The performance of the Euratom Time Correlation Analyser was investigated on a series of plutonium samples (PuO(2) powder, MOX powder and MOX pellets with a Pu-239 abundance between 60% and 80% weight). The uranium used in the mixture is either depleted, low enriched uranium or high enriched uranium. The Ispra-type multiplicity counter was used, the output being analysed in two ways. These quantities were used with the TCA theory to determine the plutonium mass. The real coincident count rate (Reals) from the multiplicity counter is used to derive the plutonium mass, based on the classical Shift Register (SR) technique. A comparison of the two analysis methods is made The measured plutonium mass was compared with results obtained from chemical analysis. The difference between calculated and declared plutonium mass are within 3% to 4% for both the TCA and SR for the mass range of the measured samples.

Additional information

Authors: DE BOECK W, SCK/CEN, Mol (BE);CARCHON R, SCK/CEN, Mol (BE);BRUGGEMAN M, SCK/CEN, Mol (BE);BONDAR L, JRC Ispra (IT);GUARDINI S, JRC Ispra (IT)
Bibliographic Reference: EUR 16355 EN (1996) 45pp., FS, free of charge
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT)
Record Number: 199610526 / Last updated on: 1996-05-13
Category: PUBLICATION
Original language: en
Available languages: en