Fig. 6 | Scientific Reports

Fig. 6

From: Emission characteristics of Eu\(^{2+}\) and Eu\(^{3+}\) under x-ray and alpha irradiation in Eu-doped CaF\(_2\) crystals

Fig. 6

(Left) Dependence of the Eu\(^{3+}\)/Eu\(^{2+}\) emission ratio on Eu concentration, obtained from radioluminescence measurements. Red and blue points represent data under \(\alpha\)-particle and X-ray irradiation, respectively. (Right) Ratio of the Eu\(^{3+}\)/Eu\(^{2+}\) emission intensity under \(\alpha\)-irradiation to that under X-ray irradiation, plotted as a function of Eu concentration. The ratio remains nearly constant for Eu concentrations above 1%.

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