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Stephen W.S. McKeever

Bio: Stephen W.S. McKeever is an academic researcher from Oklahoma State University–Stillwater. The author has contributed to research in topics: Optically stimulated luminescence & Thermoluminescence. The author has an hindex of 49, co-authored 202 publications receiving 12647 citations. Previous affiliations of Stephen W.S. McKeever include University of Birmingham & University of Sussex.


Papers
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01 Oct 1988
TL;DR: In this paper, theoretical background and additional factors governing thermoluminescence are discussed. But the authors focus on the geology applications and do not address the effect of temperature variations on the properties of the thermoluminant.
Abstract: Preface 1. Introduction 2. Theoretical background 3. Thermoluminescence analysis 4. Additional factors governing thermoluminescence 5. Defects and thermolumienscence 6. Thermoluminescence dosimetry (TLD) 7. Thermoluminescence dating 8. Geological applications 9. Instrumentation Appendices References Index.

1,457 citations

Book
01 Jan 1985
TL;DR: In this paper, theoretical background and additional factors governing thermoluminescence are discussed. But the authors focus on the geology applications and do not address the effect of temperature variations on the properties of the thermoluminant.
Abstract: Preface 1. Introduction 2. Theoretical background 3. Thermoluminescence analysis 4. Additional factors governing thermoluminescence 5. Defects and thermolumienscence 6. Thermoluminescence dosimetry (TLD) 7. Thermoluminescence dating 8. Geological applications 9. Instrumentation Appendices References Index.

1,388 citations

Book
08 Sep 1997
TL;DR: In this article, the authors offer an account of thermoluminescence (TL) and other thermally stimulated phenomena, and the results of TL in different materials are described in some detail.
Abstract: In this text, the authors offer an account of thermoluminescence (TL) and other thermally stimulated phenomena. Although most recent experimental results of TL in different materials are described in some detail, the emphasis is on general processes, and the approach is more theoretical.Thus , the details of the possible processes which can take place during the excitation of the sample, and during its heating, are analyzed. The methods for analyzing TL glow curves are critically discussed, and recommendations as to their application are made. Also discussed are the expected behaviour of these phenomena as functions of the experimental parameters, for example, the dose of excitation. The consequences concerning the main applications of TL (for example, radiation dosimetry) are also discussed in detail as well as the similarities and dissimilarities of other thermally stimulated phenomena, and the simultaneous measurements of the latter and TL.

1,141 citations

Book
01 Jan 2003
TL;DR: Optically Stimulated Luminescence (OSL) dosimetry is attractive to the health physics and dosimetric community due to its all-optical character, fast data acquisition and the avoidance of heating the detector.
Abstract: Optically Stimulated Luminescence (OSL) dosimetry is attractive to the health physics and dosimetry community due to its all-optical character, fast data acquisition and the avoidance of heating the detector. Until recently there was no luminescent material sensitive enough to radiation, and at the same time suitable for stimulation with visible light, for use in this application. However, anion-deficient aluminum oxide doped with carbon (Al2O3:C) appears to be not only an extremely sensitive thermoluminescence (TL) material, but is also well-suited to OSL applications. Several OSL readout protocols have been suggested, including cw-OSL, pulsed OSL (POSL), and 'delayed' OSL (DOSL). The paper discusses the physical mechanisms that give rise to the OSL signals and the dependence of these signals upon absorbed dose. Example applications of the use of OSL from Al2O3:C in environmental radiation and ultraviolet-B dosimetry are discussed.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

653 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors reported the observation of optically pumped lasing in ZnO at room temperature using a plasma-enhanced molecular beam epitaxy on sapphire substrates.
Abstract: We report the observation of optically pumped lasing in ZnO at room temperature. Thin films of ZnO were grown by plasma-enhanced molecular beam epitaxy on (0001) sapphire substrates. Laser cavities formed by cleaving were found to lase at a threshold excitation intensity of 240 kW cm−2. We believe these results demonstrate the high quality of ZnO epilayers grown by molecular beam epitaxy while clearly demonstrating the viability of ZnO based light emitting devices.

2,126 citations

Journal ArticleDOI
TL;DR: Different single-aliquot regenerative-dose (SAR) protocols have been applied for some years to quartz grains for determining the equivalent dose, in both dating and retrospective dosimetry studies as mentioned in this paper.

1,568 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a method of distinguishing between quartz and feldspar based solely on their luminescence behavior, using the ratio of the OSL signal when measured with and without prior infrared stimulation.

848 citations

Journal ArticleDOI
03 Dec 2004-Science
TL;DR: Mössbauer spectra measured by the Opportunity rover revealed four mineralogical components in Meridiani Planum at Eagle crater: jarosite- and hematite-rich outcrop, hematITE-rich soil, olivine-bearing basaltic soil, and a pyroxene-bearing Basaltic rock (Bounce rock).
Abstract: Mossbauer spectra measured by the Opportunity rover revealed four mineralogical components in Meridiani Planum at Eagle crater: jarosite- and hematite-rich outcrop, hematite-rich soil, olivine-bearing basaltic soil, and a pyroxene-bearing basaltic rock (Bounce rock). Spherules, interpreted to be concretions, are hematite-rich and dispersed throughout the outcrop. Hematitic soils both within and outside Eagle crater are dominated by spherules and their fragments. Olivine-bearing basaltic soil is present throughout the region. Bounce rock is probably an impact erratic. Because jarosite is a hydroxide sulfate mineral, its presence at Meridiani Planum is mineralogical evidence for aqueous processes on Mars, probably under acid-sulfate conditions.

742 citations

Book
01 Jan 2003
TL;DR: Optically Stimulated Luminescence (OSL) dosimetry is attractive to the health physics and dosimetric community due to its all-optical character, fast data acquisition and the avoidance of heating the detector.
Abstract: Optically Stimulated Luminescence (OSL) dosimetry is attractive to the health physics and dosimetry community due to its all-optical character, fast data acquisition and the avoidance of heating the detector. Until recently there was no luminescent material sensitive enough to radiation, and at the same time suitable for stimulation with visible light, for use in this application. However, anion-deficient aluminum oxide doped with carbon (Al2O3:C) appears to be not only an extremely sensitive thermoluminescence (TL) material, but is also well-suited to OSL applications. Several OSL readout protocols have been suggested, including cw-OSL, pulsed OSL (POSL), and 'delayed' OSL (DOSL). The paper discusses the physical mechanisms that give rise to the OSL signals and the dependence of these signals upon absorbed dose. Example applications of the use of OSL from Al2O3:C in environmental radiation and ultraviolet-B dosimetry are discussed.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

653 citations