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      https://www.ias.ac.in/article/fulltext/pram/014/02/0165-0173

    • Keywords

       

      Thermoluminescence; CaF2 crystals; frequency factor; rare earth elements; dosimentry; geological dating

    • 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.

    • Author Affiliations

       

      M A El-Kolaly1 2 S M D Rao1 K S V Nambi1 A K Ganguly1

      1. Health Physics Division, Bhabha Atomic Research Centre, Bombay - 400 085
      2. Radiation Protection Department, Atomic Energy Establishment, Cairo, Egypt
    • Dates

       
  • Pramana – Journal of Physics | News

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