Relationship between Melt Composition and Stability of Scintillation Properties of PbWO4:Y3+ Crystals

Abstract

Abstract: The light yield of some Y³⁺ doping PbWO₄ crystals increases after low dose rate irradiation, and
the radiation hardness is sensitive to annealing temperature. In this study, the experiments among Sb, La³⁺, Y³⁺ doping and La³⁺/Sb,
Y³⁺/Sb co-doping PWO crystals were carried out, the composition of the melt in the top of the crystals was also measured by the XRF method. The
experimental results show that this exceptional behavior only exists in PWO crystals containing Y³⁺ ions. In addition those crystals have 420nm
absorption band in optical transmission spectra. In the processes of PWO crystal growth by the modified Bridgeman method, it is salutary to keep the melt
in a negative charge environment, thus preventing the formation of interstitial oxygen. Integrating with the data obtained, the mechanism of this phenomenon
was discussed, and the principles of choosing dopants to suppress it were also brought forward.

Key words: lead tungstate, doping, light yield, melt, radiation hardness

CLC Number:

ZHANG Xin,LIAO Jing-Ying,XIE Jian-Jun,SHEN Bin-Fu,SHAO Pei-Fa,NI Hai-Hong,LI Chang-Quan,YIN Zhi-Wen. Relationship between Melt Composition and Stability of Scintillation Properties of PbWO₄:Y³⁺ Crystals[J]. Journal of Inorganic Materials.

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Relationship between Melt Composition and Stability of Scintillation Properties of PbWO₄:Y³⁺ Crystals

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