Investigation on thermally assisted optically stimulated luminescence (TA - OSL) signal in various sodium chloride samples

Renata Majgier; Magdalena Biernacka; Piotr Palczewski; Arkadiusz Mandowski; George S Polymeris

doi:10.1016/j.apradiso.2018.10.019

Investigation on thermally assisted optically stimulated luminescence (TA - OSL) signal in various sodium chloride samples

Appl Radiat Isot. 2019 Jan:143:98-106. doi: 10.1016/j.apradiso.2018.10.019. Epub 2018 Oct 21.

Authors

Renata Majgier¹, Magdalena Biernacka², Piotr Palczewski³, Arkadiusz Mandowski², George S Polymeris⁴

Affiliations

¹ Institute of Physics, Jan Dlugosz University, ul. Armii Krajowej 13/15, 42-202 Częstochowa, Poland. Electronic address: renata.majgier@ajd.czest.pl.
² Institute of Physics, Jan Dlugosz University, ul. Armii Krajowej 13/15, 42-202 Częstochowa, Poland.
³ Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5/7, 87-100 Torun, Poland.
⁴ Institute of Nuclear Sciences, Ankara University, TR-06100 Beşevler, Ankara, Turkey.

PMID: 30391717
DOI: 10.1016/j.apradiso.2018.10.019

Abstract

Sodium chloride (NaCl) is a phosphor with potential significance in retrospective dosimetry and geological dating. NaCl has been extensively studied for practical use in OSL dosimetry, however, the exact mechanism of the OSL emission is not well explained. This work attempts to extend the information on NaCl luminescent properties by establishing the occurrence of very deep traps in NaCl using the thermally assisted OSL (TA - OSL) method. The studied material was sodium chloride in different forms: halite minerals from Kłodawa salt mine in Poland and NaCl in chemically pure form. The isothermal TA - OSL signal was measured at various temperatures between 25 °C and 280 °C after a prior irradiation and TL erasing of shallow and main traps. The appearance of a strong TA - OSL signal indicates the occurrence of very deep traps in all forms of investigated salt. The temperature dependence of TA - OSL was determined and the activation energy for thermal assistance corresponding to deep traps in NaCl was estimated. For selected temperatures of TA - OSL readout (200 °C and 280 °C) the dose response was examined in wide dose range (1-1000 Gy). Sublinearity was found in different dose range depending on the type of samples.

Keywords: Dose response; Halite; Sodium chloride; Thermal assistance; Thermally-assisted optically stimulated luminescence; Very Deep traps.