Thermal Effect on TL Response of Single Doped LiF+NaF:RE Polycrystalline Phosphors

E. Gomez-Chayres; E.  Cruz-Zaragoza; M.I.   Gil Tolano; L.  Perez Cruz; P. R.  Gonzalez; M. C. Salcedo Luna

doi:10.15415/jnp.2016.41012

Authors

E. Gomez-Chayres Posgrado en Ciencias Químicas, Facultad de Química, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510 Ciudad de México, México.
E. Cruz-Zaragoza Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70543, 04510 Ciudad de México, México.
M.I. Gil Tolano Posgrado en Ciencias Químicas, Facultad de Química, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510 Ciudad de México, México. ;Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70543, 04510 Ciudad de México, México.
L. Perez Cruz Posgrado en Ciencias Químicas, Facultad de Química, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510 Ciudad de México, México.
P. R. Gonzalez Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca S/N, 52750 Ocoyoacac, Estado de México, México.
M. C. Salcedo Luna Unidad de Servicios de Apoyo a la Investigación, Facultad de Química, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510 Ciudad de México, México.

DOI:

https://doi.org/10.15415/jnp.2016.41012

Keywords:

thermoluminescence, dosimeters, thermal effect, rare earth, alkaline fluorides

Abstract

In this work, the sintering and annealing effects on the thermoluminescent (TL) behavior of undoped and rare earth (RE)-doped LiF+NaF powder samples (RE = Ce³⁺, Eu³⁺, Lu³⁺ or Tl⁺, at 0.5 mol%) was analyzed by evaluating the sensitivity to gamma radiation and TL response of the material. The polycrystalline samples were obtained by solid state reaction at 1000°C. The samples were irradiated in a Gammacell-3000 Elan irradiator loaded with ¹³⁷Cs sources. The glow curves of the LiF+NaF doped with lutetium or thallium show an intense glow peak at about 175°C and 135°C, respectively. When the phosphor was doped with cerium or europium the glow curves were complex in their structure, with TL peaks observed at 155°C and 165°C, respectively. The linear dose-response was between 10 and 50 Gy for cerium, europium or lutetium doped LiF+NaF samples, while for the thallium doped and undoped samples such intervals were 10-100 Gy and 10-500 Gy, respectively. Because the shape of the glow curves were complex, the analysis was carried out in (i) samples without a sintering treatment where the TL response was found insensitive to pre-irradiation annealing treatment, and (ii) sintered samples (300, 350, 400 or 500 °C), in this last case the TL response was dependent on the annealing temperature (100-400 °C), finally (iii) the kinetics parameters of the glow curves were analyzed by assuming a general order kinetics model. The observed glow curves and TL characteristics of the LiF+NaF:RE phosphor make attractive this material to be useful in gamma dose dosimetry.

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