Photo-transfer of tl grade natural calcium fluoride by induced ultra-violet irradiation

Abstract EN

Natural CaF2 shows four main glow peaks.

The third one (P3) at 453K is considered as the dosimetry peak.

By deconvolution (CGCD) technique this peak could be analysed into 3 simple overlapping peaks at 440, 455 and 482K.

The kinetic parameters of these peaks have been calculated, like its activation energy (E), frequency factor (s), mean life time (τ) and the resonance escape probability (P).

The chemical composition of CaF2 has been analysed specially the major elements as well as the trace elements.

The photo-transfer phenomenon has been studied in some details.

This transfer due to P3 with UV exposure increase with increasing time till 120 seconds then shows saturation.

The rate of photo-transfer is increased by increasing the pre-gamma exposure.

From the experimental results and theoretical calculations, it could be evaluated that the first part of P3 will be decayed after 5.05 years while the last part of the same peak could be disappear after 88.73 years when the irradiated TL material is stored at 25oC.