Identification of ESR centers and their role in the TL of natural salt from Lluta, Peru

Darwin J. Callo-Escobar, Nilo F. Cano, T. K. Gundu Rao, Carlos D. Gonzales-Lorenzo, Klinton V. Turpo-Huahuasoncco, Yolanda Pacompia, Monise B. Gomes, Jose F. Benavente, Jose F.D. Chubaci, Shigueo Watanabe, Jorge S. Ayala-Arenas

Research output: Contribution to journalArticlepeer-review


In this study, the thermoluminescence (TL) properties of natural NaCl from Lluta, Arequipa-Peru was investigated. The number of peaks and the kinetic parameters associated with the TL glow peaks of NaCl sample after gamma-irradiation were analyzed by initial rise and deconvolution method. Defect centers induced in pure salt by gamma irradiation have been studied by electron spin resonance (ESR) with a view to identify the centers associated with the TL process in the salt. Thermal annealing experiments indicate the presence of three defect centers. Center I characterized by the g-value 2.011 is identified as an O ion and relates with the dominant TL peak at 220 °C. Center II with a g-value of 2.0058 is attributed to a F center and is found to correlate with the 128 °C TL peak. Center III has of g-value 2.014 and is also assigned to an O ion.

Original languageEnglish
Article number110126
JournalApplied Radiation and Isotopes
StatePublished - Apr 2022

Bibliographical note

Funding Information:
The authors would like to express thanks to Ms. E. Somessari from the Institute for Energy and Nuclear Researches (IPEN), Brazil, for kindly carrying out the gamma irradiation of the samples. This work was carried out with financial support from UNSA-Investiga, Peru (Process number IBAIB-02-2018-UNSA). The authors are greatly indebted to Dr. B.C. Bhatt, ex Bhabha Atomic Research Center, Trombay, Mumbai, India.

Publisher Copyright:
© 2022 Elsevier Ltd


  • Defects centers
  • ESR
  • NaCl
  • Radiation effects
  • TL


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