Thermal annealing behavior of α-Al2O3 scintillation screens

Lederer, S.; Akhmadaliev, Shavkat; Forck, P.; Gütlich, E.; Lieberwirth, A.; Ensinger, Wolfgang

doi:10.1016/j.nimb.2015.08.024

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…Generally, scintillators that recover slowly at RT are more suitable for use in high-radiation environments because they are easier to calibrate [16]. Because color centers at high temperatures (usually above 300 • C) may be eliminated at rapidly, thermal annealing can restore radiation damage suffered by scintillators [20,21]. Figure 3 shows the color change of scintillators before and after gamma-ray irradiation, as well as after thermal annealing.…”

Section: Radiation Damage Mechanismmentioning

confidence: 99%

A Review of Inorganic Scintillation Crystals for Extreme Environments

et al. 2021

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In the past, the main research and use of scintillators in extreme environments were mainly limited to high energy physics and the well-logging industry, but their applications are now expanding to reactor monitoring systems, marine and space exploration, nuclear fusion, radiation therapy, etc. In this article, we review and summarize single-crystal inorganic scintillator candidates that can be applied to radiation detection in extreme environments. Crucial scintillation properties to consider for use in extreme environments are temperature dependence and radiation resistance, along with scintillators’ susceptibility to moisture and mechanical shock. Therefore, we report on performance change, with a focus on radiation resistance and temperature dependence, and the availability of inorganic scintillator for extreme environments—high radiation, temperature, humidity and vibration—according to their applications. In addition, theoretical explanations for temperature dependence and radiation resistance are also provided.

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Section: Radiation Damage Mechanismmentioning

confidence: 99%

A Review of Inorganic Scintillation Crystals for Extreme Environments

et al. 2021

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“…The selection of colour centres that act as intermediate levels in the two-step multi-photon excitation is not a trivial task. Sapphire possesses a broad range of intrinsic defects, which also differ in their charge states [51]. Significant differences in excitation and emission spectra evidence large Fig.…”

Section: Multi-photon Absorption Involving Deep Local Energetic Levels In the Band-gapmentioning

confidence: 99%

“…A free electron could be radiatively captured from the conduction band to the V O + centre, emitting UV luminescence centred at 3.85 eV, transforming the centre to the V O 0 state. Mono-vacancies of oxygen V O are primary defects in sapphire generated by irradiation with high-energy photons or ions [51,62]. At high irradiation doses, the concentration of single defects becomes large and neighbouring defects form more complex F centre aggregates.…”

Section: Multi-photon Absorption Involving Deep Local Energetic Levels In the Band-gapmentioning

confidence: 99%

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The behaviour of sapphire under intense two-colour excitation by picosecond laser

Gedvilas¹,

Stankevič²,

Račiukaitis³

2021

physics

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Ultrashort pulse lasers are evidencing their benefits in the processing of transparent materials. Sapphire is one of the most attractive engineering materials today. It is hard and, therefore, difficult to machine mechanically to the required shape. Laser dicing is one of the promising techniques for sapphire separation. Two-pulse two-colour irradiation was applied to initiate free-shape cutting of the material. Two collinear laser beams with wavelengths of 1064 and 355 nm, pulse duration of 10 ps and inter-pulse delay of 0.1 ns were combined to induce intra-volume modifications (directional cracks) in sapphire for wafer separation. The photon energy of both beams is well below the band gap, and various channels of the multi-photon excitation were involved in the process. Significant enhancement in the modification area was experimentally observed when intensities of focused infrared and ultraviolet beams were within narrow ranges. We discuss the resonant laser–sapphire interaction mechanisms, leading to up to four times higher excitation of the material involving multiple photons and energetic levels of intrinsic defects in the band-gap. The energy level schemes of colour centres involved in two-step multi-photon absorption in sapphire under intensive laser irradiation have been prepared.

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