Abstract
A non-destructive technique for the elemental and isotopic analysis.
Highlights
Neutron interaction cross sections show resonance structures that are characteristic for each nuclide
These structures are the basis of Neutron Resonance Analysis (NRA) as a Non Destructive Analysis (NDA) technique to characterise materials.[1,2,3]
Neutron resonance structures can be observed by measuring a neutron energy spectrum a er a white neutron beam traverses a sample by applying the Time-Of-Flight (TOF) technique
Summary
The accident at the Fukushima Daiichi nuclear power plants triggered an interest in NRTA as a NDA technique to determine the composition of complex nuclear materials.[13]. An analysis of complex nuclear materials, such as debris of melted fuel or spent nuclear fuel pellets, by NRTA is challenging due to their characteristics: i.e. the presence of matrix materials that do not create low energy resonance structures, the complexity of transmission spectra due to overlapping resonances and the temperature and shape of the samples. The potential of NRTA to analyse nuclear materials containing plutonium was shown by transmission measurements at a 10 m station of GELINA using a set of PuO2 reference samples with different isotopic composition.[17] For complex samples like debris of melted fuel or cylindrical pellets the thickness of the object in the direction of the neutron beam is not constant. All uncertainties in this paper are given at a 68% confidence limit
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