Characterization of a neutron imaging setup at the INES facility

The Italian Neutron Experimental Station (INES) located at the ISIS pulsed neutron source (Didcot, United Kingdom) provides a thermal neutron beam mainly used for diffraction analysis. A neutron transmission imaging system was also developed for beam monitoring and for aligning the sample under inve...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2013-10, Vol.726, p.31-36
Main Authors: Durisi, E.A., Visca, L., Albertin, F., Brancaccio, R., Corsi, J., Dughera, G., Ferrarese, W., Giovagnoli, A., Grassi, N., Grazzi, F., Lo Giudice, A., Mila, G., Nervo, M., Pastrone, N., Prino, F., Ramello, L., Re, A., Romero, A., Sacchi, R., Salvemini, F., Scherillo, A., Staiano, A.
Format: Article
Language:English
Subjects:
Beams (radiation)
Cultural heritage
Detectors
Imaging
INES (sat nav sys)
Linearity
Metal alloy
Neutron diffraction
Neutron imaging
Neutron radiography
Tomography
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Summary:The Italian Neutron Experimental Station (INES) located at the ISIS pulsed neutron source (Didcot, United Kingdom) provides a thermal neutron beam mainly used for diffraction analysis. A neutron transmission imaging system was also developed for beam monitoring and for aligning the sample under investigation. Although the time-of-flight neutron diffraction is a consolidated technique, the neutron imaging setup is not yet completely characterized and optimized. In this paper the performance for neutron radiography and tomography at INES of two scintillator screens read out by two different commercial CCD cameras is compared in terms of linearity, signal-to-noise ratio, effective dynamic range and spatial resolution. In addition, the results of neutron radiographies and a tomography of metal alloy test structures are presented to better characterize the INES imaging capabilities of metal artifacts in the cultural heritage field. A full characterization of the present INES imaging set-up was carried out.Two CCD cameras and two scintillators (ZnS/6LiF) of different thicknesses were tested.Linearity, effective dynamic range and spatial resolution were determined.Radiographies of steep wedges were performed using the highest dynamic range setup.Tomography of a bronze cube was performed using the best spatial resolution setup.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2013.05.074