A consistent calibration approach for neutron-coincidence counting of small PuO(2) and MOX samples
In its future on-site laboratories at Sellafield and La Hague, and in fuel fabrication plants, the Euratom Safeguards Directorate will utilize neutron-coincidence counting as a prime plutonium assay technique for verification measurements on gram-sized plutonium powder and pellet samples. For a thorough assessment of potential systematic measurement errors, and for economizing future calibration work, it is essential to gain detailed knowledge about the behaviour of the instrument response from such samples. Comprehensive test measurements with a combined neutron-gamma counter were performed to establish experimentally the neutron-coincidence response for the 3 sample categories, showing differences of a few per cent. High-precision Monte Carlo calculations were carried out to gain further insight into the dependence of the coincidence rate on main sample characteristics. A calibration approach using a minimum number of reference materials together with appropriate analytical corrections is proposed.
Bibliographic Reference: Paper presented: 19th Annual Symposium on Safeguards and Nuclear Material Management, Montpellier (FR), May 13-15, 1997
Availability: Available from (1) as Paper EN 40448 ORA
Record Number: 199810038 / Last updated on: 1998-02-03
Original language: en
Available languages: en