Abstract
The phototransferred thermoluminescence (PTTL) of sintered pellets of natural CaF 2 from Brazil is compared with that of CaF 2 doped with Ce 3+ and/or Dy 3+ . It is shown that the excitation spectrum provides a convenient way to find an optimum condition of pre-heat treatment of sintered CaF 2 after UV irradiation. The sintered CaF 2 containing a small amount of Ce 3+ (0.2 mol%) shows a strong glow peak around 90°C after UV irradiation. On co-doping with Dy 3+ in CaF 2 :Ce 3+ , the prominent glow peak shifts to 270°C. The peak intensity shows a linear response to the UV irradiation dose. The recombination process of these main glow peaks is discussed on the basis of the TL emission and the excitation peaks caused by the relevant impurities.
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