Thermoluminescence response of previously heated NaCl : Eu crystals to UV radiation
Por:
Mondragón-Galicia G., Mendoza-Anaya D., Nicho-Diaz M.E., García-García R., Reyes-Gasga J.
Publicada:
21 feb 2008
Resumen:
In this work we report the modification in the thermoluminescent (TL) response to ultraviolet (UV) radiation of Czochralski-grown NaCl : Eu crystals when they are pre-heated. The crystals were pre-heated at 273, 473, 573, 673, 773 and 873K for 2 h in an inert atmosphere, observing the highest response in crystals pre-heated at 573K and the lowest in crystals pre-heated at 473 K. To correlate the TL response with the thermal treatment and, in a certain way, with the microstructure developed in the crystals, they were observed with a low vacuum scanning electron microscope. At 373K the crystals showed spherical precipitates of 100 nm size homogeneously distributed, whereas at 473 and 573 K, the crystals showed, besides spherical precipitates, wire-like precipitates from 1.0 to 7.0 mu m in length. The precipitates changed to a square 4 mu m in size at 673K which diminished to 1.0 mu m in size in crystals heated at 773 and 873 K. Clearly the shape of the precipitates has an influence on th
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico
Instituto Nacional de Investigaciones Nucleares, Departmento Tecnología de Materiales, Carretera México-Toluca s/n La Marquesa, Ocoyoacac, Edo. de México, C.P. 52750, Mexico
FCQI, UAEM, Av. Universidad 1001, Col. Chamilpa, C.P. 62210, Cuernavaca, Morelos, Mexico
Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, C.P. 62209, Cuernavaca, Morelos, Mexico
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