Thermoluminescence in calcium fluoride doped with terbium and gadolinium ions

Add time:09/26/2019    Source:infona.pl

Thermoluminescence (TL) in sintered CaF 2 co-doped with Tb 4 O 7 and Gd 2 O 3 has been investigated for UV and X-ray irradiation. Three TL glow peaks for the CaF 2 :Tb, Gd sample are observed at about 353, 435K (437K: for X-ray) and 523K by heating the sample at a rate of 20Kmin-1 after UV or X-ray irradiation at room temperature. It was found that the second peak (435K) intensity became stronger than that of the sample singly doped with only terbium or gadolinium ions. From the TL emission spectrum and the excitation and emission spectra of photo luminescence for the CaF 2 doped activators, it is concluded that the TL of Tb3+ ions is sensitized by the existence of Gd3+ ions. The 435K TL peak may be also suitable for using it as a dosimeter.

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