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

Callo-Escobar D.J.; Cano N.F.; Gundu Rao T.K.; Gonzales-Lorenzo C.D.; Turpo-Huahuasoncco K.V.; Pacompia Y.; Gomes M.B.; Benavente J.F.; Chubaci J.F.D.; Watanabe S.; Ayala-Arenas J.S. · Applied Radiation and Isotopes (2022) · DOI: 10.1016/j.apradiso.2022.110126

Resumen

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.

Instituciones: Universidad Nacional de San Agustín de Arequipa