A simple method to correct for the temperature lag in TL glow-curve measurements

Kitis, G.; Tuyn, J.W.N.

doi:10.1088/0022-3727/31/16/017

Cited by 119 publications

(48 citation statements)

References 14 publications

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“…This is frequently overlooked but the problem has been discussed in a number of publications. 16,[29][30][31][32] The fast heating rate data are unsuitable for kinetic analysis. A second problem is that emission bands normally broaden with increasing temperature and may vary in terms of their luminescence efficiency.…”

Section: Discussionmentioning

confidence: 99%

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

et al. 2015

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Thermoluminescence (TL) and radioluminescence (RL) are reported over the temperature range 25-673 K from MgSiO 4 :Tb and MgSiO 4 :Eu. The dominant signals arise from the transitions within the Rare Earth (RE) dopants, with limited intensity from intrinsic or host defect sites. The Tb and Eu ions distort the lattice and alter the stability of the TL sites and the peak TL temperature scales with the Tb and Eu ion size. The larger Eu ions stabilize the trapped charges more than for the Tb, and so the Eu TL peak temperatures are ;20% higher. There are further size effects linked to the TL driven by the volume of the upper state orbitals of the rare earth transitions. For Eu the temperatures of the TL peaks are wavelength dependent since higher excited states couple to distant traps via more extensive orbits. The same pattern of peak temperature data is encoded in RL during heating. The data imply that there are sites in which the rare earth and charge stabilizing defects are closely associated within the host lattice, and the stability of the entire complex is linked to the lattice distortions from inclusions of impurities.

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Section: Discussionmentioning

confidence: 99%

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

et al. 2015

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“…Since the samples had a suffi ciently large thickness (1 mm), it was necessary to take into account the temperature gradient between the sample and the heater. The method used for calculat ing the true values of the temperature of the TL peak and the heating rate in the presence of a temperature gradient was described in [18]. First, from the results of measurements at low heating rates, where the tem perature gradient is negligible, we calculated the con stant c according to the expression…”

Section: Resultsmentioning

confidence: 99%

Luminescent and dosimetric properties of nanostructured ceramics based on aluminum oxide

et al. 2013

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Abstract-The main features of thermoluminescence (TL) of nanostructured ceramics based on anion defective aluminum oxide have been investigated. The kinetic parameters of the TL dosimetric peak at 475 K have been determined. The possibility of using nanostructured ceramics for beta radiation dosimetry of high doses (up to 1 kGy) with thermoluminescence of deep traps has been justified. It has been found that the light sum of the dosimetric peak decreases with an increase in the heating rate due to the temperature quenching of the luminescence. The obtained results have confirmed that the mechanism of TL quenching in anion defective aluminum oxide is associated with the temperature dependence of the probability of the capture in deep traps, which can be caused by thermal ionization of excited states of F centers.

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“…Nevertheless many journal articles continue to appear with modelling based on the heater temperature, despite a number of publications which have given detailed indications of the errors involved, or empirical suggestions as to how to minimise them [2][3][4][5]. …”

Section: Thermoluminescence Dosimetrymentioning

confidence: 99%

Common mistakes in luminescence analysis

Wang

Townsend

2012

J. Phys.: Conf. Ser.

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Abstract. Luminescence techniques are powerful and sensitive probes to study imperfections, impurities and modifications of insulating materials. They are used in a wide range of disciplines from condensed matter physics to archaeology and mineralogy and the methods have developed over nearly a century. Early equipment was often not quantitative and data were collected in formats that were difficult to process and manipulate, and so signals were frequently presented in terms of the initial signals without corrections for equipment spectral sensitivity. Unfortunately not only did this distort the information but often it resulted in incorrect interpretations. Further, the incorrect data handling has persisted into modern usage both by physicists and those in other fields who merely use luminescence as a sensitive technique. Several main types of problem are considered. These include temperature errors in thermoluminescence dosimetry; subtleties in the signal intensity corrections for the responses of both the spectrometer and detectors; grating polarization effects; sample anisotropy; and common errors in spectral deconvolution, especially failure to transform from wavelength to energy plots. IntroductionLuminescence signals provide information on relaxation processes in both inorganic and biological materials and the photon energy of the transition is primarily defined by the electronic structure around the emission site. Subtle variations in the structure will then influence the transition energy and excited state lifetime. Such variations have been successfully used to track changes over volumes as large as 50 neighbouring shells. Luminescence is therefore a powerful probe of defect structures in insulators, as well as responding to impurities, phase changes and distortions such as those caused by stress or nanoparticle inclusions. Equally, the changes induced by local distortion make luminescence a useful probe to distinguish between healthy and diseased biological material and it is used in the emerging field of Optical Biopsy. Luminescence signals have been studied for more than a century with techniques from simple visual observation to black and white or colour photography. By the 1960s more quantitative detectors, such as photomultiplier tubes became available. However the spectral information was generally displayed on a chart recording as a monochromator swept through the wavelength range of the system. Such raw data were then published and used as the basis for discussion and interpretation of the luminescence. For some applications this was acceptable, for example in mineralogical applications changes in spectra revealed different component materials and the presence of rare earth ions were easily identified by characteristic line spectra. It must be recalled that in the 1960s attempts to remove the background dark current, and then scale the signals to correct for the transmission efficiency of the monochromator and sensitivity of the PM tube involved tedious manual processing (N.B. on line computer...

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A simple method to correct for the temperature lag in TL glow-curve measurements

Cited by 119 publications

References 14 publications

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Luminescent and dosimetric properties of nanostructured ceramics based on aluminum oxide

Common mistakes in luminescence analysis

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