FIELD: registration of X-ray irradiation. SUBSTANCE: proposed composition contains 10.0000-12.3750 mol % of Ln2O3 (where Ln is chosen of Ce, Dy, Er, Eu, Sm, Tb, Tm and Yb), 0.0625-1.2500 mol % of M2O3 (where M is chosen of La, Gd and Lu), 0.0625-1.2500 mol % of Y2O3 and Ta2O5. EFFECT: increases efficiency of luminescence.
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