Al5BO9:Tb3+: Synthesis, structural characterization and thermoluminescence dosimetry studies for high intensity thermal neutron beams
Meghnath SenRakesh ShuklaNimai PathakVidha BhasinSambhu Nath JhaD. BhattacharyyaV. SathianProbal ChaudhuryA. K. Tyagi
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During the interaction of ionising radiation with matter a part of the absorbed energy is transferred to prompt luminescence or fluorescence, another fraction is stored in the form of trapped charge carriers mostly at lattice defect sites, while the rest is dissipated through non-radiative processes. Although the efficiency of the energy storage is one of the most important questions in the investigation of the TL materials, its absolute measurement is difficult, and needs sophisticated calibration procedures. The present paper reports on relative efficiencies of charge trapping vs luminescence production in the most widely used TL dosemeter materials, based on parallel measurements of radioluminescence and thermoluminescence with the same light detection system. In this way it was possible to measure relative yields without geometrical, optical transmittance and detection efficiency corrections. The measured relative thermoluminescence vs radioluminescence yields for several widely used phosphors (LiF, Al2O3, CaSO4 and CaF2) are presented.
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Abstract Initial data are reported for X-ray induced luminescence and thermoluminescence from a number of compounds of interest for electro-optic applications. The materials used were LiNbO3, LiTaO3, Ba2NaNb5O15 and LiIO3. In general the signals were weak with the strongest features of both radio-luminescence and thermoluminescence occurring in the temperature range 30 to 100 K. The techniques have revealed a number of defect states in each of the materials.
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The effects of Dy co-doping on the thermoluminescence (TL) characteristics of K2Ca2(SO4)3 : Eu phosphor are studied. Though the sensitivity of the K2Ca2(SO4)3 : Eu phosphor is decreased by five times to get the sensitivity slightly less than that of CaSO4 : Dy, the broadness of the glow peak is increased. The decrease in peak intensity of the phosphor on co-doping it with Dy gives an insight into the emission mechanism of the phosphor which involves energy transfer from Eu2+ to Dy3+. The phosphor has a simple TL glow curve structure with a single prominent peak at around 430 K. The photoluminescence emission spectra has three peaks (440, 475 and 570 nm) which could be attributed to the Eu2+ and Dy3+ emissions. Fading and reusability characteristics of the new phosphor are also studied and it is found that the phosphor is quite suitable for use in dosimetry of ionizing radiations.
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Abstract Thermoluminescence analysis is a sensitive technique for studies of imperfections in insulators and in radiation dosmietry. Natural minerals, and many synthetic materials, are often spatially non-uniform in their optical emission and knowledge of such features is essential for modelling of the thermoluminescence processes. To quantify such problems a Photek photon imaging camera has been added to the Sussex TL system. Data show examples of (i) zones of high intensity emission, even when there are no obvious anomalies in the emission spectra; (ii) differences between the uniformity of radioluminescence and thermoluminescence; (iii) resolution of signals from multi-mineral mixtures, and (iv) evidence of discharging zones from pyroelectrics. Examples of such data are presented.
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