Method of measuring thermal assistance energy associated with OSL traps in α-Al2O3:C phosphor

Mishra, D.R.; Soni, Anuj; Rawat, N.S.; Kulkarni, M.S.; Bhatt, B. C.; Sharma, D.N.

doi:10.1016/j.radmeas.2011.05.069

Cited by 25 publications

(7 citation statements)

References 15 publications

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“…The fasted PIC σ f is found to 0.4 times than that of fasted PIC of the commercially available α-Al 2 O 3 :C(Mishra et al, 2011) for same stimulation wavelength. However, this…”

mentioning

confidence: 79%

TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Raj

Mishra

Soni

et al. 2016

Radiation Physics and Chemistry

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“…The fasted PIC σ f is found to 0.4 times than that of fasted PIC of the commercially available α-Al 2 O 3 :C(Mishra et al, 2011) for same stimulation wavelength. However, this…”

mentioning

confidence: 79%

TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Raj

Mishra

Soni

et al. 2016

Radiation Physics and Chemistry

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“…However, it is difficult to experimentally register TL peaks at such high temperatures. The problem can be solved though by means of recently developed thermally assisted OSL (TA-OSL) method (Polymeris et al, 2010;Mishra et al, 2011;Soni et al, 2012). According to this method a high-dose irradiated sample is exposed to intensive light from blue or dark-blue LED.…”

Section: High-dose Irradiation Effect On Luminescent and Dosimetric Pmentioning

confidence: 99%

Advantages and challenges of high-dose thermoluminescent detectors

Кортов

Ustyantsev

2013

Radiation Measurements

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“…In case of Al 2 O 3 :C, the stimulation is not restricted to one particular wavelength, transition of charges from the deeper traps to the higher electronic states is unlikely, instead it moves to a higher vibrational state of the same electronic state as an effect of temperature. Mishra et al (2011a) formulated the theory of TA-OSL for Al 2 O 3 :C. …”

Section: Temperature Dependence Model For Al 2 O 3 :Cmentioning

confidence: 99%

“…Fig. 3 shows the CW-OSL at various temperatures for a given set of experimentally evaluated (Mishra et al, 2011a) values, with fixed CW stimulation intensity φ o = 48 mW/cm 2 of 470 nm light. Inset of Fig.…”

Section: Ta-osl: Improvement In Mddmentioning

confidence: 99%

Thermally assisted OSL: A potent tool for improvement in minimum detectable dose and extension of dose range of Al2O3:C

et al. 2013

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Abstract:The influence of electron-phonon interaction on the shape of the optically stimulated luminescence decay curve of Al 2 O 3 :C has been studied using thermally assisted optically stimulated luminescence (TA-OSL). The minimum detectable dose (MDD) of a phosphor depends on the standard deviation of the background signal which affects the signal-to-noise ratio. The standard deviation of the background signal reduces at lower stimulation light intensity while the readout time increases. Further, measurement at higher temperature enhances the OSL signal with faster decay due to the temperature dependence of photo-ionization cross-section. To achieve the same decay constant and more signal, the temperature of measurement was raised. As a result of lowering the stimulation intensity at higher temperature (85°C) the overall MDD of α-Al 2 O 3 :C was found to improve by 1.8 times. For extension of dose linearity in higher range, deeper traps were studied by simultaneous application of CW-OSL and thermal stimulation up to 400°C, using a linear heating rate of 4K/s. By using this method, two well defined peaks at 121°C and 232°C were observed. These TA-OSL peaks have been correlated with two deeper defects which can be thermally bleached at 650°C and 900°C respectively. These deeper defects are stable up to 500°C, so they can store absorbed dose information even if the sample is inadvertently exposed to light or heat. The dose vs. TA-OSL response from deep traps of α-Al 2 O 3 :C was found to be linear up to 10 kGy, thus extending its application for high dose dosimetry.

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Method of measuring thermal assistance energy associated with OSL traps in α-Al2O3:C phosphor

Cited by 25 publications

References 15 publications

TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

TL and OSL studies of carbon doped magnesium aluminate (MgAl2O4:C)

Advantages and challenges of high-dose thermoluminescent detectors

Thermally assisted OSL: A potent tool for improvement in minimum detectable dose and extension of dose range of Al2O3:C

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