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

Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The influence of electron-phonon interaction on the shape of the optically stimulated lumi-nescence decay curve of Al2O3:C has been studied using thermally assisted optically stimulated lumi-nescence (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 in-tensity at higher temperature (85°C) the overall MDD of α-Al2O3:C was found to improve by 1.8 times. For extension of dose linearity in higher range, deeper traps were studied by simultaneous ap-plication of CW-OSL and thermal stimulation up to 400°C, using a linear heating rate of 4K/s. By us-ing 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 infor-mation even if the sample is inadvertently exposed to light or heat. The dose vs. TA-OSL response from deep traps of α-Al2O3:C was found to be linear up to 10 kGy, thus extending its application for high dose dosimetry.
Wydawca
Czasopismo
Rocznik
Strony
258--265
Opis fizyczny
Bibliogr. 16 poz., wykr.
Twórcy
autor
  • Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
autor
  • Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
autor
  • 2DST Fellow, C/o Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
autor
  • Technical Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
autor
  • Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
  • Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
autor
  • Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India-400085
Bibliografia
  • 1. Akselrod MS, Kortov VS, Kravetsky DJ and Gotlib VI, 1990. Highly sensitive thermoluminescent anion defective α-A12O3:C single crystal detectors. Radiation Protection Dosimetry 32(1): 15-20.
  • 2. Akselrod MS, Agersnap Larsen N, Whitley V and McKeever, SWS, 1998. Thermal quenching of F-center luminescence in α-Al2O3:C. Journal of Applied Physics 84(6): 3364-3373, DOI 10.1063/1.368450.
  • 3. Akesrold MS, and Gorelova EA, 1993. Deep traps in highly sensitive α-Al2O3: C TLD Crystals. Nuclear Tracks and Radiation Measurements 21(1): 143-146, DOI 10.1016/1359-0189(93)90065-H.
  • 4. Bailey RM, 2001. Towards a general kinetic model for optically and thermally stimulated luminescence of quartz. Radiation Measurements 33(1): 17-45, DOI 10.1016/S1350-4487(00)00100-1.
  • 5. Bøtter-Jensen L, Bulur E, Duller GAT and Murray AS, 2000. Advances in luminescence instrument systems. Radiation Measurements 32(5-6): 523-528, DOI 10.1016/S1350-4487(00)00039-1.
  • 6. Hütt G, Jaek I and Tchonka J, 1988. Optical dating: K-feldspars optical response stimulation spectra. Quaternary Science Reviews 7(3-4): 381-385, DOI 10.1016/0277-3791(88)90033-9.
  • 7. Kulkarni MS, Mishra DR and Sharma DN, 2007. A versatile integrated system for thermoluminescence and optically stimulated lumines-cence measurements. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 262(2): 348-356, DOI 10.1016/j.nimb.2007.05.013.
  • 8. Markey BG, McKeever SWS, Akselrod MS, Botter-Jensen L, Agersnap Larsen N and Colyott LE, 1996. The temperature dependence of optically stimulated luminescence from α-Al2O3. Radiation Pro-tection Dosimetry 65: 185-189.
  • 9. McKeever SWS, Akselrod MS and Murkey BG, 1996. Pulsed optically stimulated luminescence dosimetry using α-Al2O3:C. Radiation Protection Dosimetry 65: 267-272.
  • 10. McKeever SWS, Bφtter-Jensen L, Agersnap Larsen N and Duller GAT, 1997. Temperature dependence of OSL decay curves experimental and theoretical aspects. Radiation Measurements 27(2): 161-170, DOI 10.1016/S1350-4487(96)00106-0.
  • 11. McKeever SWS and Morris MF, 1994. Computer simulations of optical bleaching of TL and OSL signals. Radiation Measurements 23(2-3): 301-306, DOI 10.1016/1350-4487(94)90056-6.
  • 12. Mishra DR, Soni A, Rawat NS, Kulkarni MS, Bhatt BC and Sharma DN, 2011a. Method of measuring thermal assistance energy associated with OSL traps in α-Al2O3:C phosphor. Radiation Measurements 46(8): 635-642, DOI 10.1016/j.radmeas.2011.05.069.
  • 13. Mishra DR, Kulkarni MS, Rawat NS, Soni A, Bhatt BC and Sharma DN, 2011b. Preliminary Non-Linear Light Modulation OSL Studies using α-Al2O3: C. Radiation Measurements 46(12): 1462-1468, DOI 10.1016/j.radmeas.2011.06.013.
  • 14. Poolton NRJ, Bøtter-Jensen L and Johnsen O, 1995. Thermo-optical properties of optically stimulated luminescence in feldspar. Radiation Measurements 24(4): 531-534, DOI 10.1016/1350-4487(94)00114-G.
  • 15. Spooner NA, 1994. On the optical dating signal from quartz. Radiation Measurements 23(2-3): 593-600, DOI 10.1016/1350-4487(94)90105-8.
  • 16. Yukihara EG, Whitley VH, Polf JC, Klein DM, McKeever SWS, Aksel-rod AE and Akselrod MS, 2003. The effects of deep trap popula-tion on the thermoluminescence of Al2O3:C. Radiation Measure-ments 42(4-5): 627-638, DOI 10.1016/j.radmeas.2007.01.054.
Uwagi
EN
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-e78e6445-0030-4126-8223-a13d34e492bf
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