Measurement of small Pu contaminated waste items by passive neutron and gamma techniques
The Joint Research Centre uses the passive neutron correlation technique for the determination of the plutonium mass in radioactive waste. This technique is complemented by passive gamma-spectrometry for the determination of the isotopic composition. For NDA of radioactive waste, various effects which influence the assay result have been studied. One particular problem investigated is to distinguish between curium and plutonium. In calculations an accuracy of about +/-20% has been obtained for a detector head of 15% efficiency. The PUJRC code with a self correcting gamma-spectrometric analysis has been applied to determine the most interesting Pu-240 isotope with an accuracy of better than 10%, for samples which are less than 20 cm from the concrete surface. The presence of Cm-244 in the waste has been investigated. The problems related to interference of specific gamma-lines are still under investigation.
Bibliographic Reference: Paper presented: 2nd International Seminar on Radioactive Waste Products, Jülich (DE), May 28 - June 6, 1990
Availability: Available from (1) as Paper EN 35393 ORA
Record Number: 199011564 / Last updated on: 1994-12-02
Original language: en
Available languages: en