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铕激活的发光晶体,在不同能量的辐射激发下,发光性质有所不同。McClure和Kiss曾报道过在γ射线辐照下,CaF_2中的RE~(3+)可以被还原为RE~(2+),并相应地出现RE~(2+)的吸收光谱。Ершов等发现
Europium-activated luminescent crystals, different in the excitation of radiation energy, luminescence properties are different. It has been reported by McClure and Kiss that RE ~ (3+) in CaF_2 can be reduced to RE ~ (2+) and corresponding to the absorption spectrum of RE ~ (2+). Ершов and other found