Communication Dans Un Congrès Année : 2024

YAG :Ce3+/4+ aerogels : efficiency, timing, diffusion and self-absorption

Résumé

Detection of radionuclides that decay directly to the ground state in the atmosphere requires to detect the beta or alpha radiation directly, which is very challenging due to their short mean free path in air at normal pressure. This suggests that the highest detection efficiency is obtained when the radionuclide is incorporated in the sensing part of the detector, which is applied with different gas radionuclides in ionisation chambers (gas-gas mixing) and for liquid solution in the liquid scintillation counting (LSC) technique (gas-liquid mixing). We hereby introduce the concept of gas-solid mixing to design an efficient detector, wherein the radioactive gas is introduced into a highly porous transparent inorganic scintillator. In this frame we have prepared YAG:Ce aerogels from sol-gel nanoparticle dispersion. Post-synthesis thermal treatment (sintering/calcination) at several temperatures was applied to the aerogels demonstrating a significant impact on the cerium oxidation state and transparency. The focus of this work is also the investigation of the aerogel optical properties after being altered by sub-calcination/sintering temperature treatments in H2 or air ambient gases. This low-temperature (400°C) treatment has managed to significantly change the ratio of Ce3+/4+ population in the sample, thus introducing a novel, easy and reversible approach to change scintillating properties of YAG:Ce aerogel. In this presentation, the effect of the thermal treatment on the transparency, diffusion, self-absorption, photoluminescence and scintillation efficiency and timing will be discussed in the frame of their use as sensor in the Triple to Double Ratio method, the standard technique used for liquid scintillation and the metrology of radionuclides.
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Dates et versions

cea-04958709 , version 1 (20-02-2025)

Identifiants

  • HAL Id : cea-04958709 , version 1

Citer

Pavlo Mai, Yannis Cheref, Raphael Marie-Luce, Frederic Lerouge, Sylvie Pierre, et al.. YAG :Ce3+/4+ aerogels : efficiency, timing, diffusion and self-absorption. 17th International Conference on Scintillating Materials and their Applications (SCINT 2024), University of Milano, Jul 2024, Milano, Italy. p52. ⟨cea-04958709⟩
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