Abstract
A new peak at about 650°C has been observed in the thermoluminescence emission of gamma irradiated natural fluorites containing significant quantities of lanthanide rare-earth (RE) elements as impurities. Thermal activation energy of the corresponding trap has been evaluated to be 2·99 eV with a frequency factor of 1016 sec−1. The optical activation energy, as deduced from photo-transfer-induced-TL from this trap, is 5·36 eV. Many types of natural fluorites as well as synthetically grown CaF2 crystals doped with single and pairs of rare earth elements have been studied and the results indicate that the high temperature peak is associated with Sm impurity coexisting with Y, La or Ce in CaF2. There are indications that this newly observed TL peak can be gainfully employed in ultraviolet dosimetry and geological dating of fluorite deposits.
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References
Bonfiglioli G 1968Thermoluminescence of geological materials ed. D J Mc Dougall (New York: Academic Press) p. 15
El-Kolaly M A 1977Thermoluminescence studies of natural and doped CaF 2 phosphors, Ph.D. Thesis University of Bombay, Bombay
Fong F K 1967Progress in solid state chemistry ed H Reiss (New York: Pergamon)3 135
Garlick G F J and Gibson A F 1948Proc. Phys. Soc. 60 574
Halperin A and Braner A A 1960Phys. Rev. 117 408
Kaufhold J and Herr W 1968Thermoluminescence of geological materials ed. D J Mc Dougall (New York: Academic Press) p 153
Merz J L and Pershan P S 1967Phys. Rev. 162 217
Nakajima T 1971Proc. Third Int. Conf. Lumin. Disim. Riso Rept 249 (Denmark: Danish Atomic Energy Comm.)
Nambi K S V, Kathuria S P and Sunta C M 1968Radiation protection monitoring (Vienna: IAEA) p. 321
Nambi K S V, Bapat V N and Bhasin B D 1974Further advances in lunar research: LUNA 16and 20samples eds N Bhandari and M N Rao (New Delhi: Indian National Science Academy) p. 111
Nambi K S V 1975Nucl. Instrum. Meth. 130 239–243
Pringsheim P 1949Fluorescence and phosphorescence (New York: Interscience) p. 660
Przibram K 1956Irradiation colours and luminescence (New York: Pergamon) p. 176
Rao S M D 1975Proc. Natl. Symp. TL and Appls. (Bombay: Bhabha Atomic Res. Centre.) p. 691
Samant R K, Kumar P V, Khatri D T and Nambi K S V 1974First Asian Regional Congress on Radiation Protection (Bombay: IARP, Bhabha Atomic Res. Centre) p. 52
Sunta C M, Kathuria S P and Nambi K S V 1970Proc. Natl. Symp. Radn. Phys. (Bombay: Bhabha Atomic Res. Centre.) p. 299
Sunta C M, Bapat V N and Kathuria S P 1971Proc. Third Int. Conf. Lumin. Dosim, Riso Rept. 249 (Denmark: Danish Atomic Energy Comm.) p. 146
Sunta C M 1971Proc. Third Int. Conf. Lumin. Dosim. Riso Rept. 249 (Denmark: Danish Atomic Energy Comm.) p. 392
Townsend P D, Clark C D and Levy P W 1967Phys. Rev. 155 908
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El-Kolaly, M.A., Rao, S.M.D., Nambi, K.S.V. et al. Observations on a high temperature peak in the thermoluminescence of fluorites. Pramana - J Phys 14, 165–173 (1980). https://doi.org/10.1007/BF02846226
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DOI: https://doi.org/10.1007/BF02846226