Solid state detectors based on point defects in lithium fluoride for advanced proton beam diagnostics

Piccinini, M.; Ambrosini, F.; Ampollini, A.; Carpanese, M.; Picardi, L.; Ronsivalle, C.; Bonfigli, F.; Libera, S.; Vincenti, Maria Aurora; Montereali, Rosa Maria

doi:10.1016/j.jlumin.2014.08.008

Cited by 42 publications

(21 citation statements)

References 22 publications

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“…Very recently, we have started the investigation of the optical absorption and emission properties of CCs induced in LiF crystals and thin films by low-energy protons. 17,18 In this letter, we present experimental results about the PL response of F 3 þ and F 2 point defects in optically transparent thermally evaporated LiF thin films, irradiated by 3 and 7 MeV protons in a large interval of irradiation dose.…”

mentioning

confidence: 99%

Photoluminescence of radiation-induced color centers in lithium fluoride thin films for advanced diagnostics of proton beams

Piccinini

Ambrosini

Ampollini

et al. 2015

Applied Physics Letters

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Systematic irradiation of thermally evaporated 0.8 μm thick polycrystalline lithium fluoride films on glass was performed by proton beams of 3 and 7 MeV energies, produced by a linear accelerator, in a fluence range from 1011 to 1015 protons/cm2. The visible photoluminescence spectra of radiation-induced F2 and F3+ laser active color centers, which possess almost overlapping absorption bands at about 450 nm, were measured under laser pumping at 458 nm. On the basis of simulations of the linear energy transfer with proton penetration depth in LiF, it was possible to obtain the behavior of the measured integrated photoluminescence intensity of proton irradiated LiF films as a function of the deposited dose. The photoluminescence signal is linearly dependent on the deposited dose in the interval from 103 to about 106 Gy, independently from the used proton energies. This behavior is very encouraging for the development of advanced solid state radiation detectors based on optically transparent LiF thin films for proton beam diagnostics and two-dimensional dose mapping.

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confidence: 99%

Photoluminescence of radiation-induced color centers in lithium fluoride thin films for advanced diagnostics of proton beams

Piccinini

Ambrosini

Ampollini

et al. 2015

Applied Physics Letters

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“…The spectrally integrated PL emitted by radiation-induced F 2 and F 3 + CCs, whose local concentrations are proportional to the energy deposited by protons in LiF, exhibits a strong increase at a distance from the cleaved edge of the film. As the PL signal is proportional to the local defects concentrations, this strong increase appears to be related to the Bragg peak position [22]. It should be noted that a luminescent signal is present beyond the presumed Bragg peak, because the beam propagation direction, not exactly parallel to the substrate surface, colored a large area of LiF film.…”

Section: Resultsmentioning

confidence: 95%

Bragg Peak Imaging In Lithium Fluoride Films By Photoluminescent Color Centers Induced By Proton Beams

Vincenti

Ambrosini

Ampollini

et al. 2015

2015 Fotonica AEIT Italian Conference on Photonics Technologies

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LiF films grown on glass and Si(100) substrates by thermal evaporation were used as radiation imaging detectors to evaluate the Bragg peak position of a 3 MeV proton beam produced by a linear accelerator. The proton irradiation of LiF films induces the formation of stable color centers, mainly the primary F centers and the aggregate F 2 and F 3 + defects, whose local concentrations are proportional to the deposited energy. Under optical pumping in the blue spectral region, F 2 and F 3 + color centers emit broad photoluminescence bands located at 678 and 541 nm, respectively, which can be detected by conventional fluorescence microscopy. Photoluminescence images of the top surface of the exposed LiF films allowed obtaining the Bragg peak position of the proton beam, whose evaluation is in satisfactory agreement with software simulations.

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“…In addition, irradiation was performed with a variety of HCPs with a dose of 5 Gy at the NIRS HIMAC, as shown in Fig. 6, which presents a plot of the relative RPL efficiency as a function of the LET ∞ value in Ag-glass: samples were exposed to 160 MeV/u 1 H ions, with In addition to the 'concentration quenching', the 'fluence saturation' must also be taken into consideration [29]. In general, as increasing in size of radionuclide, then the corresponding fluence becomes lower for the same absorbed dose of 5 Gy.…”

Section: Resultsmentioning

confidence: 99%

Fluorescent nuclear track images of Ag-activated phosphate glass irradiated with photons and heavy charged particles

Kurobori

Yanagida²,

Kodaira³

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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Solid state detectors based on point defects in lithium fluoride for advanced proton beam diagnostics

Cited by 42 publications

References 22 publications

Photoluminescence of radiation-induced color centers in lithium fluoride thin films for advanced diagnostics of proton beams

Photoluminescence of radiation-induced color centers in lithium fluoride thin films for advanced diagnostics of proton beams

Bragg Peak Imaging In Lithium Fluoride Films By Photoluminescent Color Centers Induced By Proton Beams

Fluorescent nuclear track images of Ag-activated phosphate glass irradiated with photons and heavy charged particles

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