Dose dependence of x-ray luminescence from CaF_2:Eu~(2+), Mn~(2+) phosphors

摘要

In CaF_2: Mn~(2+), Eu~(2+), the emission from Eu~(2+) decreases while the emission from Mn~(2+) increases in intensity as the x-ray duration time increases. The decrease of Eu~(2+) emission is due to the oxidation of Eu~(2+) to Eu~(3+) upon x-ray irradiation, while the increase of Mn~(2+) emission in intensity is likely due to the breakdown of the forbidden transition by the defects. This phenomenon has potential for dose-dependent radiation detection because utilizing the ratio of the two emissions from Mn~(2+) and Eu~(2+) for radiation dosimetry is more sensitive and more reliable than using emission intensity change only.