Luminescence Dating, Uncertainties, and Age Range

2014 ◽  
pp. 1-9 ◽  
Author(s):  
Jakob Wallinga ◽  
Alastair C. Cunningham
Keyword(s):  
Luminescence Dating ◽  
Age Range

scholarly journals Dating the First Australians

Radiocarbon ◽  
2002 ◽  
Vol 44 (2) ◽  
pp. 455-472 ◽  
Author(s):  
Richard Gillespie
Keyword(s):  
Recent Work ◽  
Luminescence Dating ◽  
Australian Region ◽  
Dating Methods ◽  
Age Range

The dating of selected archaeological and megafaunal sites from the Australian region is reviewed, with emphasis on recent work at some of the oldest sites. Improved chemical procedures with decreased analytical background for 14C analysis, combined with new luminescence dating methods, has confirmed many of the results processed decades ago and significantly increased the maximum age for some others. The oldest occupation horizons in four different regions reliably dated by defendable multi-method results are in the range 42–48,000 calendar years ago, overlapping with the age range for similarly well-dated undisturbed sites containing the youngest extinct megafauna. There is less secure evidence suggesting some archaeology may be earlier and some megafauna may have survived later than this period.

scholarly journals Testing feldspar luminescence dating of young archaeological heated materials using potshards from Pella (Tell Tabqat Fahl) in the Jordan valley

2017 ◽  
Vol 44 (1) ◽  
pp. 98-110 ◽  
Author(s):  
Sahar Al Khasawneh ◽  
Andrew S. Murray ◽  
Stephen Bourke ◽  
Dominik Bonatz
Keyword(s):  
Iron Age ◽  
Luminescence Dating ◽  
Jordan Valley ◽  
Luminescence Signal ◽  
Systematic Uncertainties ◽  
Infrared Stimulated Luminescence ◽  
Recent Developments ◽  
Age Range ◽  
Multiple Samples ◽  
Osl Age

Abstract Recent developments in the use of more stable feldspar signals in the luminescence dating of sediments offer the possibility of obtaining accurate feldspar luminescence ages for ceramic artefacts; this is especially interesting in locations which do not provide suitable quartz extracts. Here we examine the application of the stable infrared stimulated luminescence signal measured at elevated temperature (in this case 290°C; pIRIR290) after stimulation at about room temperature to Levantine pottery samples. A total of 52 potsherds were collected from three superimposed iron-age units at Pella (Jordan); based on 14C dating, typology and seriation these units were deposited between 700 and 900 BCE. Sand-sized quartz extracts were unsuitable, and there was insufficient sand-sized feldspar, and so polymineral fine grains were chosen for dating. Various tests for reliability were undertaken (dose recovery, dependence of De on first stimulation temperature etc.). The pIRIR signals are weak, and 14 potsherds were rejected on this basis. Of the remainder, 3 were confidently identified as outliers. Based on those sherds for which IR signals were sufficiently intense, we use the ratio of the IR50 to pIRIR290 signals to argue that these outliers do not arise from incomplete resetting during manufacture. The ages from each layer are considerably over dispersed (typically by ∼25%) but average ages for each unit are consistent with each other and with the expected age range. The average OSL age for the site is 2840 ± 220 years (n = 35), with the overall uncertainty dominated by systematic uncertainties; this average is consistent with the range of 14C ages from 970–1270 BCE reported from across the destruction horizon. We conclude that the pIRIR290 signal is delivering accurate ages, but that the variability in age from shard to shard is much greater than would be expected from known sources of uncertainty. This demonstrates the need for site ages to be based on multiple samples; individual shard ages are unlikely to be sufficiently accurate.

Recent developments in luminescence dating of Quaternary sediments

1996 ◽  
Vol 20 (2) ◽  
pp. 127-145 ◽  
Author(s):  
G.A.T. Duller
Keyword(s):  
Age Determination ◽  
Depositional Environments ◽  
Optically Stimulated Luminescence ◽  
Luminescence Dating ◽  
Quaternary Sediments ◽  
Sedimentary Sequences ◽  
Recent Developments ◽  
Novel Methods ◽  
Age Range

Luminescence dating is an important technique for providing chronological control for Quaternary sedimentary sequences. In this article recent developments in luminescence dating are described, together with the implications of these developments for the application of the various types of luminescence dating techniques now available. In particular, the development of optically stimulated luminescence (OSL) techniques has had a profound effect upon the field, enabling younger materials to be dated, increasing the diversity of depositional environments that can be dated, and allowing the development of novel methods of age determination. The most exciting developments are the ability to obtain luminescence ages for samples in the age range from 100 to 1000 years, and the ability to date individual sand grains from a sample.

Luminescence dating of Nuomuhong culture ceramics at Talitaliha site on the Northeastern Qinghai-Tibetan Plateau

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Manping Sun ◽  
Yongjuan Sun ◽  
Chongyi E ◽  
Guangliang Hou ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Direct Evidence ◽  
Qaidam Basin ◽  
Archaeological Site ◽  
Luminescence Dating ◽  
Archaeological Research ◽  
Cultural Layer ◽  
Age Range ◽  
Lower Limits ◽  
Good Agreement

Abstract As a daily utensil and artefact, the presence of ceramic at an archaeological site is direct evidence of human activity. While ceramics have been found at numerous sites on the Qinghai-Tibetan Plateau (QTP), most have been aged using conventional methods such as typology or radiocarbon dating of associated charcoal and bone. In this study, five sand-tempered grey ceramics from Talitaliha in the Qaidam Basin were dated using quartz and K-feldspar OSL. The reliability of the ceramic OSL ages was determined using six independent radiocarbon samples, three charcoal and three bone, from the same cultural layer. Six additional OSL ages were determined on sandy loess sediments at the Talitaliha site to provide upper and lower limits for the ceramic ages. The ceramic luminescence dating results are in good agreement with the 14C ages and are within the constraints of the stratigraphic OSL ages, suggesting that OSL dating of ceramics has great potential for archaeological research on the QTP. The determined age range for the Talitaliha site was between 3400–2800 cal BP; this fits well with Nuomuhong culture dates from other locations in the Qaidam Basin that range between 3400–2450 cal BP.

scholarly journals Luminescence Dating of Fluvial Deposits in the Rock Shelter of Cueva Antón, Spain

2015 ◽  
Vol 42 (1) ◽  
Author(s):  
Christoph Burow ◽  
Martin Kehl ◽  
Alexandra Hilgers ◽  
Gerd-Christian Weniger ◽  
Diego E. Angelucci ◽  
...  
Keyword(s):  
Strong Support ◽  
Luminescence Dating ◽  
Coarse Grained ◽  
Radiocarbon Dates ◽  
Rock Shelter ◽  
Fluvial Deposits ◽  
Lithic Assemblages ◽  
Rapid Accumulation ◽  
Single Grain ◽  
Age Range

Abstract The fluvial sediments at Cueva Antón, a Middle Palaeolithic rock shelter located in the valley of the River Mula (Southeast Spain), produced abundant lithic assemblages of Mousterian affinities. Radiocarbon dates are available for the upper part of the archaeological succession, while for the middle to lower parts chronometric data have been missing. Here we present luminescence dating results for these parts of the succession. Quartz OSL on small aliquots and single grain measurements yield ages ranging from 69 ± 7 ka to 82 ± 8 ka with a weighted mean of 72 ± 4 ka for sub-complexes AS2 to AS5. Equivalent dose estimates from large aliquots were highest and inconsistent with those from single grains and small multiple grain aliquots. This is probably caused by the presence of over-saturating grains, which have been quantified by single grain measurements. Additional post-IR IRSL measurements on coarse grained feldspar give strong support to a well-bleached quartz OSL signal. While independent chronometric control is missing, the results are within the expected age range and support the notion of a rapid accumulation of the fluvial deposits.

Ultrastructural Study of Human Testicular Biopsies in Infertility

1976 ◽  
Vol 34 ◽  
pp. 156-157
Author(s):  
Shirley Siew ◽  
Philip Troen ◽  
Howard R. Nankin
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Basement Membrane ◽  
Leydig Cells ◽  
Clinical Evidence ◽  
Young Male ◽  
Germinal Epithelium ◽  
Transmission Electron ◽  
Age Range ◽  
Male Subjects

Testicular biopsies were obtained from six young male subjects (age range 24-33) who complained of infertility and who had clinical evidence of oligospermia. This was confirmed on histological examination which showed a broad spectrum from profound hypospermatogenesis to relatively normal appearing germinal epithelium. Thickening of the tubular walls was noted in half of the cases and slight peritubular fibrosis in one. The Leydig cells were reported as normal or unremarkable.Transmission electron microscopy showed that the thickening of the supporting tissue of the germinal epithelium was caused more by an increase in the thickness of the layers of the lamina propria than of the tubular wall itself. The changes in the basement membrane of the tubular wall consisted mostly of a greater degree of infolding into the tubule and some reduplication which gave rise to a multilayered appearance.

Meeting the Best Practice for Hearing Aid Verification in Children: Challenges and Future Directions

2019 ◽  
Vol 28 (4) ◽  
pp. 877-894
Author(s):  
Nur Azyani Amri ◽  
Tian Kar Quar ◽  
Foong Yen Chong
Keyword(s):  
Clinical Practice ◽  
Hearing Aids ◽  
Best Practice ◽  
Hearing Aid ◽  
Evidence Based ◽  
Future Directions ◽  
Major Barrier ◽  
Klang Valley ◽  
Age Range ◽  
Fitting Hearing Aids

Purpose This study examined the current pediatric amplification practice with an emphasis on hearing aid verification using probe microphone measurement (PMM), among audiologists in Klang Valley, Malaysia. Frequency of practice, access to PMM system, practiced protocols, barriers, and perception toward the benefits of PMM were identified through a survey. Method A questionnaire was distributed to and filled in by the audiologists who provided pediatric amplification service in Klang Valley, Malaysia. One hundred eight ( N = 108) audiologists, composed of 90.3% women and 9.7% men (age range: 23–48 years), participated in the survey. Results PMM was not a clinical routine practiced by a majority of the audiologists, despite its recognition as the best clinical practice that should be incorporated into protocols for fitting hearing aids in children. Variations in practice existed warranting further steps to improve the current practice for children with hearing impairment. The lack of access to PMM equipment was 1 major barrier for the audiologists to practice real-ear verification. Practitioners' characteristics such as time constraints, low confidence, and knowledge levels were also identified as barriers that impede the uptake of the evidence-based practice. Conclusions The implementation of PMM in clinical practice remains a challenge to the audiology profession. A knowledge-transfer approach that takes into consideration the barriers and involves effective collaboration or engagement between the knowledge providers and potential stakeholders is required to promote the clinical application of evidence-based best practice.

Talk or Walk? Gait Speed over Self-Report in Association with Cognitive Speed in Healthy Older Adults

GeroPsych ◽  
2019 ◽  
Vol 32 (1) ◽  
pp. 41-52
Author(s):  
Matthew C. Costello ◽  
Shane J. Sizemore ◽  
Kimberly E. O’Brien ◽  
Lydia K. Manning
Keyword(s):  
Older Adults ◽  
Older Adult ◽  
Gait Speed ◽  
Well Being ◽  
Self Report ◽  
Subjective Report ◽  
Healthy Older Adults ◽  
Relative Value ◽  
Cognitive Speed ◽  
Age Range

Abstract. This study explores the relative value of both subjectively reported cognitive speed and gait speed in association with objectively derived cognitive speed. It also explores how these factors are affected by psychological and physical well-being. A group of 90 cognitively healthy older adults ( M = 73.38, SD = 8.06 years, range = 60–89 years) were tested in a three-task cognitive battery to determine objective cognitive speed as well as measures of gait speed, well-being, and subjective cognitive speed. Analyses indicated that gait speed was associated with objective cognitive speed to a greater degree than was subjective report, the latter being more closely related to well-being than to objective cognitive speed. These results were largely invariant across the 30-year age range of our older adult sample.

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