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|Title:||Numerical Modelling of Corrections relevant to Nuclear Accountancy Measurements by Hybrid K-edge / XRF Densitometry|
|Authors:||TOMA MAGDALENA; VAN BELLE Pieter; LUETZENKIRCHEN Klaus; SHARIKOV Dmitry|
|Citation:||ESARDA 2013 Symposium’s CD proceedings,|
|Type:||Articles in periodicals and books|
|Abstract:||Hybrid K-edge densitometry (HKED) is a radiometric technique for the non-destructive assay of U and Pu in different types of Nuclear Safeguards samples such as those encountered in existing spent-fuel Reprocessing Plants. A similar Hybrid K-Edge instrument is ready to be installed at an ITU hot cell for measurements on samples from pyro-chemical, as opposed to traditional, reprocessing of spent fuel. Unlike the low-Z matrices of traditional reprocessing samples, the matrices of pyro-reprocessing samples contain high-Z elements, such as Cd or Bi. To reduce the calibration effort normally needed for accurate routine HKED measurements, and to predict the behaviour of unusual samples, e.g. U-Pu mixtures with unusual element ratios or those with high-Z matrices, a Monte Carlo modelling approach was chosen. As the excitation of U and Pu use different fractions of the incident x-ray spectrum, special attention was given to reconstruct accurately the spectrum of the incident x-ray source used as the excitation source in the HKED instrument. In routine measurement of the U/Pu ratio, samples with similar but slightly different composition or density are analysed. A study of the effect of a sample's composition/density variations on experimentally observed U/Pu fluorescence peak area ratios has been undertaken and evaluated.|
|JRC Directorate:||Nuclear Safety and Security|
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