High-density Nb:YTaO4 single crystals for X-ray scintillation

Yueshen Zhou; Dongsheng Yuan; Encarnación G. Víllora; Daisuke Nakauchi; Takumi Kato; Noriaki Kawaguchi; Takayuki Yanagida; Kiyoshi Shimamura

doi:10.1039/D4CE00848K

論文 High-density Nb:YTaO4 single crystals for X-ray scintillation

Yueshen Zhou (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Single Crystals Group, National Institute for Materials Science) ; Dongsheng Yuan (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Single Crystals Group, National Institute for Materials Science) ; Encarnación G. Víllora (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Single Crystals Group, National Institute for Materials Science) ; Daisuke Nakauchi (Nara Institute of Science and Technology) ; Takumi Kato (Nara Institute of Science and Technology) ; Noriaki Kawaguchi (Nara Institute of Science and Technology) ; Takayuki Yanagida (Nara Institute of Science and Technology) ; Kiyoshi Shimamura (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Single Crystals Group, National Institute for Materials Science)

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Yueshen Zhou, Dongsheng Yuan, Encarnación G. Víllora, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida, Kiyoshi Shimamura. High-density Nb:YTaO4 single crystals for X-ray scintillation. CRYSTENGCOMM. 2024, 27 (1), 81-89. https://doi.org/10.1039/D4CE00848K

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(abstract)

Environmental-friendly alternatives to the commercial scintillator CdWO4, which contains the toxic element Cd, are highly desired. As potential candidates, in this work, the scintillation characteristics of Nb:YTaO4 transparent single-crystals grown from melt by the floating-zone technique are studied. It is found that the broad UV luminescence of YTaO4 can be turned into a broad visible one by the partial substitution of Ta with only 2% Nb. Therefore, Nb incorporation promotes a better spectral matching to Si-photodiode detectors while the high stopping power of YTaO4 is kept, being close to that of commercial CdWO4. The scintillation properties of pure YTaO4, with a light yield of 15900 ph/MeV and an afterglow of 0.008% after 40 ms, are comparable to those of CdWO4. The light yield weighed with a Si-photodiode reaches maximum values for 0.5 & 1% Nb:YTaO4 crystals. An improvement in optical properties is expected by the growth of higher quality crystals by a flux-technique in the future.

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