Lithium fluoride thin film detectors for low-energy proton beam diagnostics by photoluminescence of colour centres

R.M. Montereali, A. Ampollini, L. Picardi, C. Ronsivalle, F. Bonfigli, S. Libera, E. Nichelatti, M. Piccinini, M.A. Vincenti

Research output: Contribution to conferencePaper

Abstract

Optically transparent LiF thin films thermally evaporated on glass and Si(100) substrates were used for advanced diagnostics of proton beams of energies from 1.4 to 7 MeV produced by a linear accelerator for protontheraphy under development at ENEA C.R. Frascati. The proton irradiation induces the formation of stable colour centres, among them the aggregate F2and F3+optically active defects. After exposure of LiF films grown on glass perpendicularly to the proton beams, their accumulated transversal spatial distributions were carefully measured by reading the latent two-dimensional (2-D) fluorescence images stored in the LiF thin layers by local formation of these broad-band visible light-emitting defects with an optical microscope under blue lamp excitation. Taking advantage from the low thickness of LiF thin films and from the linear behaviour of the integrated F2and F3+photoluminescence intensities up to the irradiation fluence of ∼5x1015p/cm2, placing a cleaved LiF film grown on Si substrate with the cutted edge perpendicular to the proton beam, the 2-D fluorescence image of the film surface could allow to obtain the depth profile of the energy released by protons, which mainly lose their energy at the end of the path.
Original languageEnglish
DOIs
Publication statusPublished - 16 Feb 2017
Externally publishedYes
Event2016 International Conference on Defects in Insulating Materials, ICDIM 2016 - Lyon, France
Duration: 16 Feb 2017 → …

Conference

Conference2016 International Conference on Defects in Insulating Materials, ICDIM 2016
CountryFrance
CityLyon
Period16/2/17 → …

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

Cite this

Montereali, R. M., Ampollini, A., Picardi, L., Ronsivalle, C., Bonfigli, F., Libera, S., ... Vincenti, M. A. (2017). Lithium fluoride thin film detectors for low-energy proton beam diagnostics by photoluminescence of colour centres. Paper presented at 2016 International Conference on Defects in Insulating Materials, ICDIM 2016, Lyon, France. https://doi.org/10.1088/1757-899X/169/1/012012