Analytical picture of the effect of temperature treatment on UV and gamma ray sensitivity of CaF2-based TLD
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Abstract:
CaF2-based TLD treated at high temperature in air exhibit a high intrinsic thermoluminescence to UV radiations. However, this temperature treatment makes them insensitive to ionising radiations. The increase in thermoluminescence sensitivity is shown to be due to the production of oxide at the TLD material surface, whereas the reduction in gamma ray sensitivity is attributed to a change in the nature of impurity atoms responsible for TL emission.The behaviour of the thermoluminescence (TL) of CaF2-Dy (TLD-200) has been investigated for doses up to 1.5*107 rad. Five major glow peaks have been studied. The response of these peaks with doses was followed. Three peaks (at 124, 140 and 340 degrees C) show a supralinear response, while the two other (188 and 234 degrees C) do not. The total TL light exhibits supralinearity in the region between 103 and 105 rad and levels out at about 106 rad. The thermoluminescent parameters (E,S, tau ) of the glow peaks where found by the initial rise method. The results are discussed and possible explanations for the supralinearity are proposed.
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CaF2-based TLD treated at high temperature in air exhibit a high intrinsic thermoluminescence to UV radiations. However, this temperature treatment makes them insensitive to ionising radiations. The increase in thermoluminescence sensitivity is shown to be due to the production of oxide at the TLD material surface, whereas the reduction in gamma ray sensitivity is attributed to a change in the nature of impurity atoms responsible for TL emission.
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In consideration of the extensive use of thermoluminescence dosimetry in environmental monitoring, the aim of the present work is to report some experimental observations on the fading of some thermoluminescent materials as a function of the storage temperature. The study has been carried out for two different temperatures: room temperature (20 oC) and 40 oC, considering the second as the maximum average temperature that can be found in several countries. The materials used in the experiments were CaSO4/LiF:Dy, CaSO4:Dy (TLD-900), CaF2:Tm (TLD-300) and CaF2:Dy (TLD-200). These materials have been studied because of their high sensitivity and consequent convenience for environmental dosimetry.
Thermoluminescent Dosimetry
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Thermoluminescent Dosimetry
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Comments on the result given by Kathuria and Sunta (ibid., vol.12, p.1573, 1979) for the order of kinetics of peak V of the TLD-100 thermoluminescence. Further results are presented to support the view that peak V has constant first-order kinetics.
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Thermoluminescence dosimeter (TLD) CaSO4:Dy was synthesised by coprecipitation. The TLD was observed after radiation exposure to Strontium-90. The thermoluminescence intensity was read using a TLD Reader Harshaw 3500. The thermoluminescent response obtained was 59.29 nC. Then re-annealing was conducted with the temperature varied at 700, 800 and 900 °C. The thermoluminescent intensity obtained at temperatures of 700 °C, 800 °C and 900 °C was 66.12 nC, 169.45 nC, and 552.37 nC respectively. The sensitivity of the TLD increased in response to the re-annealing temperature rise. In addition to observing the thermoluminescence properties, a comparison was made between the TLD obtained from this experiment with an existing TLD in the market. Finally, also the glow-curve characteristics of the TLD were observed.
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Thermoluminescent Dosimetry
Dose rate
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