Volume 120, Number 5, December 2017
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||20 February 2018|
Bragg-curve imaging of 7 MeV protons in a lithium fluoride crystal by fluorescence microscopy of colour centres
1 ENEA C.R. Casaccia, Fusion and Technologies for Nuclear Safety and Security - Via Anguillarese 301, S. Maria di Galeria, Rome, 00123, Italy
2 ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security - Via E. Fermi 45, Frascati (RM), 00044, Italy
Received: 23 November 2017
Accepted: 1 February 2018
A lithium fluoride crystal slab was irradiated in air with a proton beam of nominal 7 MeV energy at a linear accelerator that is under development at ENEA C.R. Frascati. The irradiation generated a spatial distribution of stable colour centres in the crystal that could be detected as a luminescent image under blue-light excitation in a fluorescence microscope. The reconstruction of the whole Bragg curve from the luminescent image is here demonstrated for the first time by taking into account finite proton-energy bandwidth and saturation of defect concentration due to high absorbed dose. The obtained results confirm lithium fluoride detectors based on visible photoluminescence of radiation-induced aggregate colour centres as reliable candidate devices for advanced proton-beam diagnostics.
PACS: 61.80.-x – Physical radiation effects, radiation damage / 61.72.jn – Color centers / 78.55.Fv – Solid alkali halides
© EPLA, 2018
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