Scintillation properties of CdF2 crystal

Mihai

et al. 2017

Sci Rep

The paper is the first comprehensive study on alpha particle irradiation effects on four mid-IR materials: CaF2, BaF2, Al2O3 (sapphire) and ZnSe. The measurements of the optical spectral transmittance, spectral diffuse reflectance, radioluminescent emission, terahertz (THz) spectral response, transmittance, absorbance, refractive index, real and imaginary parts of the dielectric constant and THz imaging are used as complementary investigations to evaluate these effects. The simulations were run to estimate: (i) the penetration depth, (ii) the scattering of alpha particle beam, (iii) the amount of material affected by this interaction, and (iv) the number of vacancies produced by the radiation exposure for each type of material. The simulation results are compared to the off-line measurement outcomes. The delay and spectral composition change of the reflected THz signal highlight the modification induced in the tested materials by the irradiation process.

“…2) with components at λ = 295 nm, 320 nm and 420 nm2646 and a much smaller component is detected in visible (λ = 650 nm), as it was found in the earlier published reports.…”

Section: Discussionsupporting

confidence: 79%

Optical and THz investigations of mid-IR materials exposed to alpha particle irradiation

Mihai

et al. 2017

Sci Rep

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

“…Conventionally, it was considered that they have no temperature dependence concerning the scintillation light yield; 57) but we recently revealed that Auger free luminescence materials also shows a temperature dependence. 58) …”

Section: Recent Randd Progress Of Scintillatorsmentioning

confidence: 99%

Inorganic scintillating materials and scintillation detectors

Yanagida

2018

Self Cite

385

167

Scintillation materials and detectors that are used in many applications, such as medical imaging, security, oil-logging, high energy physics and non-destructive inspection, are reviewed. The fundamental physics understood today is explained, and common scintillators and scintillation detectors are introduced. The properties explained here are light yield, energy non-proportionality, emission wavelength, energy resolution, decay time, effective atomic number and timing resolution. For further understanding, the emission mechanisms of scintillator materials are also introduced. Furthermore, unresolved problems in scintillation phenomenon are considered, and my recent interpretations are discussed. These topics include positive hysteresis, the co-doping of non-luminescent ions, the introduction of an aimed impurity phase, the excitation density effect and the complementary relationship between scintillators and storage phosphors.

“…Meanwhile the hygroscopic nature of such halide crystals is a practical disadvantage, which requires special handling and packaging techniques. Our group has previously studied some non-and low-hygroscopic halide crystalline scintillators [7][8][9][10][11]. The present study focuses on the CsCaCl 3 crystal as a host material, which is congruently melted at 910 °C and is minimally hygroscopic [12,13].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and radiation response properties of Ce³⁺-doped CsCaCl₃crystalline scintillator

et al. 2016

Self Cite

In this paper, we report on the photoluminescence and scintillation properties of a newly developed CsCaCl 3 :Ce (0.5 mol%) crystalline scintillator grown by the vertical Bridgman method. The fluorescence quantum efficiency for the Ce 3+ characteristic emission bands centered at around 350-400 nm was 76% under excitation at 330 nm light. The photoluminescence decay time of the Ce 3+ was approximately 32 ns. When x-ray excited the crystal, intense emission bands were observed at 350-400 nm, and could be attributed to the Ce 3+ emission. The scintillation light yield of the developed crystal was ∼7600 ph MeV −1 compared to a NaI:Tl commercial scintillator, and the principal scintillation decay time was approximately 340 ns plus two fast components of around 1.6 ns and 45 ns.