Advanced multistage deconvolution applied to composite glow peak 5 in LiF:Mg,Ti (TLD-100)

Horowitz, Y.S.; Fuks, Elina; Oster, L.; Podpalov, L.; Belaish, Y.; Shachar, B.B.

doi:10.1093/rpd/ncm067

Cited by 15 publications

(10 citation statements)

References 3 publications

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“…Glow curve readout was carried out at a heating rate of 1 o C s -1 following a post-irradiation anneal (PIA) of 160 o C for 6 s which removes the low temperature glow peaks and simplifies the analysis of the effects of the photon bleach on the glow curve. Glow curve deconvolution was carried out with first order peak shapes based on anciliary thermal and optical excitation which isolate peaks 4 and 5 and allow estimates of the peak parameters relatively free of deconvolution uncertainties [9]. The starting parameters of the deconvolution analysis are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

The effect of optical bleaching at selected photon energies on the thermoluminescence of LiF:Mg,Ti

Reshes

Druzhyna

Biderman³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A new interpretation of the optical absorption energy spectrum of LiF:Mg,Ti (TLD-100) is presented in which the 4.0 eV band is composed of two-sub-bands at 3.8 eV and 4.3 eV. The new interpretation is of central importance in the understanding of the geminate recombination mechanisms giving rise to composite glow peak 5 in the thermoluminescence (TL) of TLD-100. Photon bleaches at energies of 3.6 eV and 4.3 eV on samples of gamma irradiated TLD-100 were carried out in order to investigate the correlation of the 4.3 eV absorption band with the electronhole configuration giving rise to glow peak 5a and the 3.8 eV absorption band with the e-only configuration giving rise to glow peak 5. The 4.3 eV bleach decreases peak 5a dramatically and increases peak 4 (a hole-only configuration). No such effect is observed following the 3.6 eV bleach. The results strongly support the suggested structures giving rise to the 4.3 eV and 3.8 eV bands observed in the optical absorption energy spectrum.

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Section: Methodsmentioning

confidence: 99%

The effect of optical bleaching at selected photon energies on the thermoluminescence of LiF:Mg,Ti

Reshes

Druzhyna

Biderman³

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The relative intensity of glow peak 5a was determined by computerised glow curve deconvolution using peak-shape parameters (Table 1) based on first-order kinetics (20) and deduced from ancillary studies using 4 and 5 eV optical excitations (21) , which create nearly 'single-peak' glow curves for peaks 4 and 5. Optical bleaching at 4 eV leads to an isolated peak 4 in the glow curve, and postirradiation thermal annealing at 4008C followed by 5 eV (F band) optical excitation leads to an isolated peak 5.…”

Section: Glow Curve Analysismentioning

confidence: 99%

“…A subtraction procedure then allowed the determination of the peak-shape parameters of peak 5a. These studies resulted in activation energies of 1.9, 2.3 and 2.15 eV for peaks 4, 5a and 5, respectively (21) . The uncertainty in these values is estimated at +0.1 eV for peaks 4 and 5 and +0.2 eV for peak 5a.…”

Section: Glow Curve Analysismentioning

confidence: 99%

“…Composite peak 5 (believed to arise from a TC/ LC configuration based on Mg þþ Li vac trimers (the TC) coupled to Ti(OH) n (the LC) (2) consists of the main peak 5, a low-temperature satellite ( peak 5a) and a high-temperature satellite ( peak 5b). Following low-ionisation density (LID) irradiation, peak 5 appears at a temperature of maximum intensity, T max , of 2088C when the sample is naturally cooled following the 4008C pre-irradiation anneal and then heated at a linear heating rate of 18C s 21 . Peaks 5a and 5b appear at values of T max of Y radiation in naturally cooled materials is 0.04+0.02 (1 SD) and has proven difficult to measure reproducibly even with carefully controlled annealing, readout and deconvolution protocols because of its low intensity and strong overlap with peaks 4 and 5.…”

Section: Introductionmentioning

confidence: 99%

“…As previously mentioned, the effect of ionisation density on the shape of composite peak 5 is quite subtle and easily overlooked and/or ignored (4 -6) . For low-energy alpha particles ( 1 MeV amu 21 ), the T max of composite peak 5 is shifted to lower temperatures by 58C and the width of the peak is increased. The shoulder on the low-temperature side of peak 5 (owing to peak 4) is no longer observed.…”

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Thermoluminescence solid-state nanodosimetry--the peak 5A/5 dosemeter

Fuks

Horowitz

Horowitz³

et al. 2010

Radiation Protection Dosimetry

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The shape of composite peak 5 in the glow curve of LiF:Mg,Ti (TLD-100) following 90 Sr/ 90 Y beta irradiation, previously demonstrated to be dependent on the cooling rate used in the 4008 8 8 8 8C pre-irradiation anneal, is shown to be dependent on ionisation density in both naturally cooled and slow-cooled samples. Following heavy-charged particle high-ionisation density (HID) irradiation, the temperature of composite peak 5 decreases by ∼58 8 8 8 8C and the peak becomes broader. This behaviour is attributed to an increase in the relative intensity of peak 5a (a low-temperature satellite of peak 5). The relative intensity of peak 5a is estimated using a computerised glow curve deconvolution code based on first-order kinetics. The analysis uses kinetic parameters for peaks 4 and 5 determined from ancillary measurements resulting in nearly 'single-glow peak' curves for both the peaks. In the slow-cooled samples, owing to the increased relative intensity of peak 5a compared with the naturally cooled samples, the precision of the measurement of the 5a/5 intensity ratio is found to be ∼15 % (1 SD) compared with ∼25 % for the naturally cooled samples. The ratio of peak 5a/5 in the slow-cooled samples is found to increase systematically and gradually through a variety of radiation fields from a minimum value of 0.13+ + + + +0.02 for 90 Sr/ 90 Y low-ionisation density irradiations to a maximum value of ∼0.8 for 20 MeV Cu and I ion HID irradiations. Irradiation by low-energy electrons of energy 0.1-1.5 keV results in values between 1.27 and 0.95, respectively. The increasing values of the ratio of peak 5a/5 with increasing ionisation density demonstrate the viability of the concept of the peak 5a/5 nanodosemeter and its potential in the measurement of average ionisation density in a 'nanoscopic' mass containing the trapping centre/luminescent centre spatially correlated molecule giving rise to composite peak 5.

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