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Academic literature on the topic 'Optically Stimulated Luminescence (OSL)'
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Dissertations / Theses on the topic "Optically Stimulated Luminescence (OSL)"
1
Kusoglu, Sarikaya Cemre. "Optically Stimulated Luminescence Studies On Natural Fluorites." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612962/index.pdf.
Full textAbstract:
Optically Stimulated Luminescence (OSL) is the luminescence emitted from a previously irradiated insulator (or a wide band gap semiconductor) upon exposure to light. The OSL signal intensity is a function of the radiation dose absorbed by the sample and thus can be used as the basis of a radiation dosimetry method. In the literature, OSL studies on natural fluorites are rather limited. In order to promote the material for radiation dosimetry, OSL properties of natural fluorites of different origin were examined in this study. For this purpose, dose-response, reproducibility, thermal stability and fading of the OSL signals were analyzed. In order to find a relation between OSL and TL signals, TL signals and the effect of OSL measurements on TL signals were examined. Thermal activation energies of the light sensitive TL peaks and the OSL signals were also calculated using different methods and the results were compared. Also, absence of the thermal quenching was shown. Finally, TR-OSL signals were measured to have an opinion about the recombination centers. As a result of these studies, it is possible to conclude that natural fluorites show promising features to be used as an environmental dosimeter with regard to a suitable OSL signal, range of linearity, repeatability in response, as well as being readily available at a low cost.
2
Yeltik, Aydan. "Time-resolved Optically Stimulated Luminescence (osl) Studies On Samples Containing Quartz And Feldspar." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611103/index.pdf.
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Time Resolved OSL (TR-OSL) is a technique to record the luminescence decay curve data after a brief stimulation pulse and can possibly be used for the separation of luminescence signals from quartz and feldspars. In this study luminescence emission from quartz and feldspar samples was investigated. TR-OSL signals of these samples were studied for the variations with preheating and annealing temperature, stimulation pulse width and total stimulation time, optical bleaching, radiation dose and measurement temperature. TR-OSL decay lifetime of quartz samples was found as ~40 µ<br>s. Na-feldspar and K-feldspar luminescence signals were deconvoluted using a linear sum of three exponential decays with lifetimes about 45 µ<br>s, 8 µ<br>s and 1 µ<br>s and about 35 µ<br>s, 7 µ<br>s and 0.6 µ<br>s, respectively. Since feldspars signals have a component with lifetime similar to that of quartz (~40 µ<br>s), luminescence signal separation with TR-OSL seems to be not straightforward.
3
Demirturk, Tayfun. "Dating Of Laodikeia (denizli) Building Ceramics Using Optically Stimulated Luminescence (osl) Techniques." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607746/index.pdf.
Full textAbstract:
The objective of this study is to perform Optically Stimulated Luminescence (OSL) dating on the ceramic samples from different parts of the Laodikeia by using Infra Red Stimulated Luminescence (IRSL) on polyminerals.
As a first step, a literature survey has been done about the dating system and the methodology of dating. The calibration of the system was done before carrying out the experiments. The six ceramic samples were collected from the site and dated.
The mineral compositions of the samples were examined by X-ray Diffraction Analysis, which showed that all samples contain quartz, feldspars, calcites and together with other minerals.
The equivalent dose was found by using Multiple Aliquot Additive Dose (MAAD) and Multiple Aliquot Regenerative Dose (MARD) techniques using Infra Red diode array of the system that gave the IRSL ages for samples. Alpha counter measured the dose components of uranium and thorium contributions to the annual dose. The potassium concentration was determined by Atomic Emission Spectrometry. The cosmic ray component of annual dose was evaluated by the Al2O3:C Thermoluminescence Dosimeter (TLD) discs which have been placed and kept for 8 and 11 months in the site.
From the data the IRSL ages were calculated for six ceramic samples LDKY-1, LDKY-2, LDKY-3, LDKY-4, LDKY-5 and LDKY-6 with the help of the OSL system software. The IRSL ages for these samples, in the given order, are 737 ±<br>60, 1563 ±<br>120, 1445 ±<br>110, 1602 ±<br>120, 1034 ±<br>80 and 1034 ±<br>80 years by using MAAD technique. The IRSL ages for the same samples are 870 ±<br>60, 1550 ±<br>120, 1440 ±<br>110, 1600 ±<br>120, 1030 ±<br>80 and 1030 ±<br>70 years by using MARD technique.
4
余耀良 and Yiu-leung Yieu. "OSL dating of sediment and climate change of late quaternary." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/192989.
Full textAbstract:
The objective of this project is to apply the Optical Stimulated Luminescence (OSL) technique to date the palaeo sediment from Mu Us Desert, part of the Inner Mongolia in northern China and reconstruct the palaeo environment. Five OSL samples were collected from Dagouwan, Salawusu River Valley at Inner Mongolia by Dr S. H. Li and his team in 2009. Extraction of 150μm to 180μm silt-size feldspar from collected dune sand, lacustrine facies and fluvial facies samples and running of luminescence dating therefore to obtain the age from 50ka to 90ka. Climate proxies - magnetic susceptibility, grain size, fossil vertebrates and fossil pollens have been analyzed and it is concluded that significant climate change occurred within this period, which change from domination of warm, humid and rainy summer monsoons (before 70ka) to cold, wind, windy strengthened dry winter wind and back to warm and humid again after 55ka.<br>published_or_final_version<br>Applied Geosciences<br>Master<br>Master of Science
5
Summa, Michelle Carlene. "Geologic Mapping, Alluvial Stratigraphy, and Optically Stimulated Luminescence Dating of the Kanab Creek Area, Southern Utah." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/506.
Full textAbstract:
At the turn of the century, Kanab Creek incised 30-meters into its alluvium, leaving behind fluvial terraces and thick basin fill sediments exposed along arroyo walls. Research objectives were to determine the timing and causes of past valley-filling and arroyo-cutting episodes along a 20 km-long reach of Kanab Creek in southern Utah. Fluvial deposits were mapped at the 1:12,000 scale and sediments were described and dated using Optically Stimulated Luminescence (OSL) and radiocarbon dating. The Kanab Creek valley can be divided into a narrow, upper terraced reach and a broad lower basin fill reach near Kanab, Utah. The most prominent terrace in the upper reach is Quaternary alluvial terrace 4 (Qat4), followed by Qat3, Qat2/3, and Qat2 map units. These are composed of tabular-bedded, fine-grained sand, silt, and clay layers. The Qat2/3 map unit is a both a fill and fill-cut terrace underlain by Qa4, Qa3, and Qa2 alluvium and is used when the Qat3 fill-cut (fill-strath) terrace can not be differentiated from the Qat2 fill terrace due to their similar geomorphic position. The Qat3 fill-cut terrace upstream correlates to ~8 meters of aggradation downstream. The youngest terrace, Qat1, is a minor terrace, composed of coarse-grained channel facies. More recent channel and floodplain deposits were deposited over the last century following arroyo cutting. OSL and radiocarbon results suggest at least four cycles of fluvial cutting and filling: >6-3.5ka (Qa4), ~3->1ka (Qa3), 0.7-0.12ka (Qa2), and post-1880 AD (Qa1). Correlation to regional climate records suggests major periods of aggradation correlate to regionally cooler and wetter climatic intervals. Periods of arroyo cutting occurred at >6ka, ~3ka, 1-0.7ka, and during historic arroyo cutting (1882-1914 AD), and correlate to regionally warmer, drier intervals. These periods of aggradation and incision are roughly contemporaneous with regional drainages, except for the large aggradation seen in Kanab Creek 6-3.5ka (Qa4). Analysis of terrace longitudinal profiles indicates Qat4 has the lowest concavity suggesting that Qat4 aggraded during a period of greater sediment supply and/or reduced flood regime. Although OSL samples exhibited some degree of incomplete zeroing, calculated ages using a minimum age model are consistent with radiocarbon results.
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Fan, Anchuan, and 范安川. "Quartz OSL dating of quaternary sediments from China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45700187.
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Togay, Evren. "Design And Implementation Of A Luminescence Emission Spectrometer." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614144/index.pdf.
Full textAbstract:
Luminescence is the emission of light resulting from radiative transition of an atom from an excited state to a ground state. This radiative transition yields emission of photons and the luminescence is the general name which is used to classify &ldquo<br>cold emission&rdquo<br>other than the blackbody radiation. Spectroscopy involves the measurement of intensity of emitted, absorbed or scattered electromagnetic radiation as a function of wavelength. Thus, it is a valuable tool in the study of understanding the luminescence production mechanisms. Measurement of emission spectra gives information about the energy levels of transition and structure, geometry and composition of the sample. In this study, a versatile luminescence emission spectrometer was designed and developed with the main aim of measuring Photoluminescence (PL), Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) emission spectra of materials relevant for dosimetry. The spectrometer was constructed around a Littrow type monochromator by developing the necessary hardware, firmware and software. Wavelength calibration, measurement of spectral response and determination of resolution of the spectrometer were done using calibration lamps and a calibrated spectroradiometer. Finally the performance of the constructed spectrometer was tested by measuring the emission spectra of materials such as BeO, Al2O3 and CaF2 wherever possible the measured spectra were compared with the ones reported in the literature.
8
Ng, Sin-pan, and 吳善斌. "OSL dating of palaeoshorelines of saline lakes at Inner Mongolia." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46732883.
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Aygun, Sukran Gizem. "Detection Of Gamma Irradiated Spices With Osl Method And Its Reliability." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612333/index.pdf.
Full textAbstract:
The aim of this current work is to analyze the behavior of OSL (Optically
Stimulated Luminescence) signals of irradiated spices with respect to time,
temperature, origin and the type. Throughout the experiments, 3 different type
spices from four different origins were stored at 4°<br>C and 25°<br>C for six months after
irradiation.
During experiments, unirradiated red pepper, thyme and cumin samples were analyzed
by using OSL technique in order to determine the background OSL signal values of
samples.
Samples were irradiated 10 kGy by Cobalt 60 gamma source in TAEK (Turkey Atomic
Energy Association).
After irradiation process, OSL signal values of different samples were analyzed
according to the given parameters. In order to determine the effect of temperature
on OSL signal loss, temperature (4°<br>C- 25°<br>C) was set as storage temperature. The
analyses were made monthly.
According to the statistical analyses (ANOVA- General Linear Model), origin and type
of samples were detected as significant parameters of design experiment. Time and
temperature effect on OSL signal loss changed with respect to origin and type of
samples.
After six months storage period, OSL signal was lost for most of the origin and
sample type. At the end of sixth month, an ESR analysis was performed to detect the
accuracy of the OSL technique. With respect to the results of these experiments, it
was seen that, due to optical fading, most of the samples was observed as
unirradiated by OSL technique, however ESR analyze the samples as irradiated at the
end of sixth month.
Irradiation had a detrimental effect on the microbiological load of the samples and
resulted 6 log reduction on the microbial population. After irradiation, no colony
formation was observed in total bacteria and yeast- mold count. During six month
period, no injury recovery was observed.
10
Hayden, Anne E. "Reconstructing the Holocene Arroyo History of the Upper Escalante River, Southern Utah, Using Optically Stimulated Luminescence (OSL) and Radiocarbon Dating." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1105.
Full textAbstract:
Arroyos are steep-walled, entrenched, typically ephemeral streams commonly found in dryland river systems that form when streams incise into previously deposited alluvial fill. Arroyos in the southwestern U.S. have been studied extensively following the historic period of arroyo cutting in the late 1800s and early 1900s A.D. The upper Escalante River in south-central Utah similarly began incising in 1909, and records evidence for past cut and fill cycles in well-exposed walls along the now continuous arroyo.
Establishing robust geochronologies of past arroyo cycles in these fluvial settings has been difficult. Recent improvements in accelerator mass spectrometry (AMS) radiocarbon (14C) and optically stimulated luminescence (OSL) dating provide an opportunity to link more highly resolved fluvial records to existing paleoclimate records. This allows hypotheses regarding the causes of arroyo cycles to be tested, and for the role of climate versus intrabasinal characteristics to be examined.
One major objective of this research was to examine the applicability of OSL and AMS 14C dating in the upper Escalante, as both methods have proved problematic in similar settings. In total, 37 ages were obtained, 21 OSL and 16 14C ages. The Holocene fluvial history of the upper Escalante River was reconstructed using these age results and stratigraphic relationships.
The chronostratigraphic record developed in this study suggests that at least six arroyo cycles have occurred in the upper Escalante since the middle Holocene, with incision occurring ~4.4 – 4.2 ka, ~2.6 – 2.4 ka, ~1.8 – 1.5 ka, ~1.0 – 0.9 ka, ~0.5 - 0.4 ka, and during the historic period of arroyo entrenchment. While semi-synchronous arroyo cutting (indicative of a climate signal) appears to have occurred in the Paria and Escalante drainages over the last 1 ka, correlations between proximal drainages are less clear prior to 1 ka, although this may be due in part to preservation effects. Overall, linkages to specific climate regimes and correlations to regional drainages are difficult to identify, suggesting that internal geomorphic thresholds are important in determining when arroyo entrenchment occurs in individual catchments.