Luminescence and Radiocarbon Dating of Mortars at Milano-Bicocca Laboratories

Radiocarbon ◽  
2020 ◽  
Vol 62 (3) ◽  
pp. 657-666 ◽  
Author(s):  
Laura Panzeri ◽  
Francesco Maspero ◽  
Anna Galli ◽  
Emanuela Sibilia ◽  
Marco Martini
Keyword(s):  
Statistical Approach ◽  
Optically Stimulated Luminescence ◽  
Raw Material ◽  
Historical Structures ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
Sample Age ◽  
Quartz Grains ◽  
Selection Of

ABSTRACTThis work shows the results of optically stimulated luminescence (OSL) and radiocarbon (14C) dating applied to mortars of historical structures in northern Italy. All the results are compared with archaeological evidence and thermoluminescence (TL) dating of bricks. The main issue for OSL mortar dating is that the quartz grains contained in the mortar may be only partially bleached, leading to an overestimation of the sample age. In order to identify the best protocol to apply, both multi-grain (MG) and single grain (SG) methods were used. The minimum age model (MAM) statistical approach was applied to refine their accuracy. However, the identification of the bleached grains is not always successful, indicating that further investigations are needed to develop suitable dating protocol. For the 14C technique, a crucial aspect is the selection of anthropogenic calcite. In this work the mortars were treated using a Cryosonic method to select anthropogenic calcite from raw material, and the obtained powder was sieved to select the finer fraction. Unfortunately, only in two cases an acceptable amount of sample could be obtained. All the fractions were dated via accelerator mass spectrometry (AMS), and the results compared with independently obtained dates. The results show that the execution of the dating analysis requires previous characterizations to assess the nature of the mortar components and avoid unusable fractions.

Multi-method luminescence dating of old fluvial sediments from northern Tian Shan, China

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kechang Li ◽  
Jintang Qin ◽  
Jie Chen ◽  
Jun Shen ◽  
Sheng-Hua Li
Keyword(s):  
Test Dose ◽  
Northwest China ◽  
Luminescence Dating ◽  
Early Pleistocene ◽  
Sand Sample ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
Shortening Rate ◽  
Tian Shan

AbstractAt the eastern tip of Anjihai anticline on the northern piedmont of Tian Shan (northwest China), deformed fluvial deposits have recorded active folding since the Pleistocene, but the absence of accurate ages makes it difficult to evaluate the anticline’s shortening rate. Geological studies ascribed the fluvial strata to the early Pleistocene, which poses potential challenges for luminescence dating. In this study, multi-methods luminescence dating was applied to a fluvial sand sample taken from the sandy bed of the deformed basal strata. Single grain post-Infrared Infrared Stimulated Luminescence (pIRIR) and multiple-aliquot-regenerative (MAR) dose along with multiple-elevated-temperature pIRIR (MET-pIRIR) procedures were applied to determine the paleodose of the sample. The methodological uncertainties, such as thermal transfer and initial sensitivity change, were treated by increasing the test dose and performing dose recovery test. With consideration of the potential partial bleaching and anomalous fading, various statistical metrics were applied to the De values determined by using the single grain pIRIR225, single grain pIRIR290 and MAR-MET-pIRIR290 signals. The minimum age model (MAM) De values are 11% – 17% lower than the central age model (CAM) De values in general, and the MAM De values determined by the single grain pIRIR procedures are underestimated by more than 40% when compared with those determined by MAR-MET-pIRIR290 procedure. The MAM MAR-MET-pIRIR290 De of 811 ± 44 Gy results in a burial age of 284 ka for the basal deformed fluvial strata, which is much younger than the proposed early Pleistocene age.

scholarly journals Methodological Aspects on Luminescence Dating of Fluvial Sands from the Moselle Basin, Luxembourg

2010 ◽  
Vol 35 (-1) ◽  
pp. 67-74 ◽  
Author(s):  
S. Cordier ◽  
M. Frechen ◽  
S. Tsukamoto
Keyword(s):  
Western Europe ◽  
Luminescence Dating ◽  
Dose Determination ◽  
Infrared Stimulated Luminescence ◽  
Lower Terrace ◽  
Minimum Age ◽  
Age Model ◽  
Methodological Aspects ◽  
Selection Of ◽  
Good Agreement

Methodological Aspects on Luminescence Dating of Fluvial Sands from the Moselle Basin, LuxembourgOptically stimulated luminescence (OSL) dating of quartz and infrared-stimulated luminescence (IRSL) dating of feldspar were applied to fluvial sands from the lower terrace (M1) of the Moselle valley in Luxembourg (western Europe). The dating results indicated that the aggradation period for the sediments from below the M1 alluvial terrace can be correlated to the Weichselian upper Pleniglacial (MIS 2), which is in good agreement with the general chronostratigraphy of the Moselle terrace staircase. The ages were obtained from small aliquots of quartz and feldspars, using the single aliquot regenerative (SAR) protocol. The equivalent dose determination included a series of tests and the selection of the Minimum Age Model as the most appropriate statistical model. This made it possible to provide a reliable methodological background for further luminescence dating of fluvial sediments from the Moselle basin.

scholarly journals Methodological study on single grain OSL dating of mortars: Comparison of five reference archaeological sites

2017 ◽  
Vol 44 (1) ◽  
pp. 77-97 ◽  
Author(s):  
Petra Urbanová ◽  
Pierre Guibert
Keyword(s):  
Input Parameter ◽  
Osl Dating ◽  
Archaeological Sites ◽  
Annual Dose ◽  
Dose Distributions ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
External Consistency ◽  
The Impact

Abstract The paper focuses on single grain OSL dating of quartz extracted from known age archaeological mortars, potentially representing a new tool for dating the construction of historical buildings. Apart from SG-OSL measurements and annual dose rate determination, the samples are systematically studied by means of optical microscopy, EDX-SEM cartography and beta autoradiography in order to evaluate the possible microdosimetric heterogeneity of each sample, arising principally from local variations of potassium content. Besides the practical aspects concerning sampling, preparation and appropriate choice of measurement conditions, the paper aims at the differences in microstructure and in elementary composition between different mortars and attempts to evaluate the impact of these aspects on the dispersion of equivalent dose distributions. Finally, archaeological doses (paleodoses) are calculated by using central age model (CAM), minimum age model (MAM) and internal-external consistency criterion (IEU). The appropriateness of these models for the exploitation of the measured SG-OSL data as well as for a hypothesis on the estimation of the input parameter needed to run these models are discussed. Three categories of mortars were identified: samples without any exploitable SG-OSL signal, samples that could have been reliably dated and poorly bleached samples affected by microdosimetric variations whose dating still remains complicated. Finally, the hypothesis on distinguishing between reliable and questionable dating results is raised and the potentials of the method for dating mortars are pointed out.

scholarly journals Quartz Single Grain Osl Sensitivity Distributions: Implications for Multiple Grain Single Aliquot Dating

2007 ◽  
Vol 26 (-1) ◽  
pp. 19-29 ◽  
Author(s):  
Edward Rhodes
Keyword(s):  
Numerical Model ◽  
National Park ◽  
Australian Capital Territory ◽  
Sensitivity Distribution ◽  
Minimum Age ◽  
Age Model ◽  
Single Grain ◽  
Simpson Desert ◽  
Simple Numerical Model ◽  
Real Multiple

Quartz Single Grain Osl Sensitivity Distributions: Implications for Multiple Grain Single Aliquot DatingA simple probabilistic numerical model was used to construct synthetic Dedistributions by combining the simulated OSL from grains of different sensitivities and with various simulated Devalues. This is useful for exploring the complex patterns generated by summing the signals from many grains in real, multiple grain OSL dating scenarios, and demonstrates that the form of the sensitivity distribution has a significant effect on the identification of mixed dose populations in multiple grain single aliquot methods. I describe the simple numerical model and its implementation. I present measured quartz single grain OSL sensitivity distributions for an aeolian dune sample from the Simpson Desert, Northern Territory, Australia, and from a suite of 9 fluvial sediments from Namadgi National Park, Australian Capital Territory, Australia, to illustrate effects that result from natural differences. Minimum age model determinations of synthetic Devalues are used to assess the validity of dose values estimated from multiple grain single aliquot measurements.

scholarly journals Local inundation distances and regional tsunami recurrence in the Indian Ocean inferred from luminescence dating of sandy deposits in Thailand

2012 ◽  
Vol 12 (7) ◽  
pp. 2177-2192 ◽  
Author(s):  
D. Brill ◽  
N. Klasen ◽  
K. Jankaew ◽  
H. Brückner ◽  
D. Kelletat ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Luminescence Dating ◽  
Indian Ocean Tsunami ◽  
Minimum Age ◽  
Age Model ◽  
The Indian Ocean ◽  
Tsunami Recurrence ◽  
Quartz Grains ◽  
Sand Sheets ◽  
Partial Bleaching

Abstract. The Holocene beach-ridge plain of Phra Thong Island (Ko Phra Thong, SW Thailand) provides sedimentary evidence of several palaeotsunamis, in addition to the deposit of the 2004 Indian Ocean tsunami. Due to poor preservation conditions, these palaeoevent layers are restricted to swales. Correlation across beach ridges, which is important e.g. to reconstruct inundation distances, remains a major challenge. A primary tool for establishing a precisely confined correlation of the sand sheets is the use of chronological data. Since the application of radiocarbon dating is limited by the scarcity of appropriate material, this study utilised optically stimulated luminescence (OSL) dating of tsunamigenic quartz grains. Generally, the sediments showed favourable luminescence properties regarding signal intensity, dose recovery and thermal stability. Disturbances of the OSL signal due to partial bleaching were corrected using the minimum age model. At least three palaeoevents – being 490–550, 925–1035 and 1740–2000 yr old – were distinguished by dating the discontinuous sand sheets at four different sites. Besides this chronological framework, the OSL data provide the opportunity to correlate the discontinuous sand sheets between spatially separated sites within the same swale as well as across ridges. This allows for first estimates of inundation distances for the palaeotsunamis documented on Phra Thong Island. Furthermore, the two younger events overlap in age with contemporaneous tsunami and earthquake evidence from other coasts bordering the Indian Ocean.

scholarly journals Single-Grain Quartz OSL Characteristics: Testing for Correlations within and between Sites in Asia, Europe and Africa

2019 ◽  
Vol 3 (1) ◽  
pp. 2 ◽  
Author(s):  
Yue Hu ◽  
Bo Li ◽  
Zenobia Jacobs
Keyword(s):  
Growth Curve ◽  
Response Curve ◽  
Decay Curve ◽  
Optically Stimulated Luminescence ◽  
Curve Shape ◽  
Sensitivity Change ◽  
Single Grain ◽  
Distinctive Difference ◽  
Brightness Decay ◽  
Quartz Grains

We studied the characteristics of the optically stimulated luminescence (OSL) signal of single-grain quartz from three sites in China, Italy, and Libya, including the brightness, decay curve and dose response curve (DRC) shapes, recuperation, and reproducibility. We demonstrate the large variation in OSL behaviors for individual quartz grains of different samples from different regions, and show that recuperation, sensitivity change, and reproducibility are independent of the brightness and decay curve shape of the OSL signals. The single-grain DRCs can be divided into at least eight groups with different characteristic saturation doses (D0), and a standardized growth curve (SGC) can be established for each of the DRC groups. There is no distinctive difference in the shape of OSL decay curves among different DRC groups, but samples from different regions have a difference in the OSL sensitivities and decay shapes for different groups. Many of the quartz grains have low D0 values (30–50 Gy), and more than 99% of the grains have D0 values of <200 Gy. Our results raise caution against the dating of samples with equivalent dose values higher than 100 Gy, if there are many low-D0 and ‘saturated’ grains.

Teknologi Esktrasi dan Cara Pemisahannya untuk Mendapatkan Kembali Karotenoid dari Minyak Sawit : Suatu Tinjauan

2016 ◽  
Vol 9 (1) ◽  
pp. 80-95
Author(s):  
Agus Sudibyo ◽  
Sardjono Sardjono
Keyword(s):  
Vitamin A ◽  
Palm Oil ◽  
Beta Carotene ◽  
Cost Effective ◽  
Raw Material ◽  
Extraction And Separation ◽  
Molecular Product ◽  
Industrial Use ◽  
Palm Oil Mill ◽  
Selection Of

Crude palm oil (CPO)is the richest natural plant source of carotenoids in terms of retinol (pro-vitamin A) equivalent, whereas palm oil mill effluent (POME) is generated from palm oil industry that contains oil and carotenes that used to be treated before discharge. Carotenoids are importance in animals and humans for the purpose of the enhancement of immune response, conversion of vitamin A and scavenging of oxygen radicals. This component has different nutritional  functions and benefits to humaan health. The growing interest in the other natural sources of beta-carotene and growing awareness to prevent pollution has stimulated the industrial use of CPO and POME as a raw material for carotenoids extraction. Various technologies of extraction and separation have been developed in order to recover of carotenoids.This article reports on various technologies that have been developed in order to recover of carotenoids from being destroyed in commercial refining of palm oil and effects of some various treatments on the extraction end separation for carotenoid from palm oil and carotenoids concentration. Principally, there are different technologies, and there is one some future which is the use of solvent. Solvent plays important role  in the most technologiest, however the problem of solvents which are used is that they posses potentiaal fire health and environmental hazards. Hence selection of the  most safe, environmentally friendly and cost effective solvent is important to design of alternative extraction methods.Chemical molecular product design is one of the methods that are becoming more popular nowadays for finding solvent with the desired properties prior to experimental testing.ABSTRAKMinyak sawit kasar merupakan sumber karotenoid terkaya yang berasal dari tanaman sawit sebagai senyawa yang sama dengan retinol atau pro-vitamin A; sedangkan limbah pengolahan minyak sawit dihasilkan dari industri pengolahan minyak sawit yang berisi minyak dan karotene yang perlu diberi perlakuan terlebih dahulu sebelum dibuang. Karotenoid merupakan bahan penting yang diperlukan pada hewan dan manusia guna memperkuat tanggapan terhadap kekebalan, konversi ke vitamin A dan penangkapan gugus oksigen radikal. Dengan berkembangnya ketertarikan dalam mencari beta-karotene yang bersumber dari alam lain dan meningkatnya kesadaran untuk mencegah adanya pencemaran lingkungan, maka mendorong suatu industri untuk menggunakan CPO dan POME sebagai bahan baku untuk diekstrak karotenoidnya. Berbagai macam teknologi guna mengekstrak dan memisahkan karotenoid telah dikembangkan untuk mendapatkan kembali karotenoidnya. Makalah ini melaporkan dan membahas berbagai jenis teknologi yang telah dikembangkan guna mendapatkan kembali senyawa karotenoid dari kerusakan di dalam proses pemurnian minyak sawit secara komersial dan pengaruh beberapa perlakuan terhadap ekstrasi dan pemisahan karotenoid dari minyak sawit dan konsentrasi karotenoidnya. Pada prinsipnya, berbagai teknologi yang digunakan untuk mengekstrak dan memisahkan karotenoid terdapat perbedaan, dan terdapat salah satu teknologi yang digunakan untuk esktrasi dan pemisahan karotenoid adalah menggunakan bahan pelarut. Pelarut yang digunakan mempunyai peranan yang penting dalam teknologi ekstrasi; namun pelarut yang digunakan untuk mengekstrak tersebut mempunyai persoalan karena berpotensi mengganggu kesehatan dan membahayakan cemaran lingkungan. Oleh karena itu, pemilihan jenis teknologi yang aman, ramah terhadap lingkungan dan biaya yang efektif untuk penggunaan pelarut merupakan hal penting sebelum dilakukan desain metode/teknologi alternatif untuk esktrasi karotenoid. Pola produk molekuler kimia merupakan salah satu metode yang saat ini menjadi lebih populer untuk mencari pelarut dengan sifat-sifat yang dikehendaki sebelum diujicobakan. Kata kunci :    karotenoid, ekstrasi, pemisahan, teknologi, minyak sawit kasar, limbah industri pengolahan sawit.

scholarly journals Selection of plantain cultivars as raw material for ripe plantain flour

2021 ◽  
Vol 672 (1) ◽  
pp. 012071
Author(s):  
N K I Mayasti ◽  
R Kumalasari ◽  
R Ekafitri ◽  
D Desnilasari ◽  
D N Surahman ◽  
...  
Keyword(s):  
Raw Material ◽  
Selection Of

Compressed acoustic sealing foam optimization investigation using statistical approach

2021 ◽  
Vol 263 (1) ◽  
pp. 4955-4961
Author(s):  
Mathieu Gontier ◽  
Barbara Romeyns
Keyword(s):  
Porous Materials ◽  
Statistical Approach ◽  
Complete System ◽  
Statistical Techniques ◽  
Industrial Equipment ◽  
Acoustic Performance ◽  
Material Characteristics ◽  
Sealing Performance ◽  
The Right ◽  
Selection Of

In industry segments such as automotive and industrial equipment the use of compressed porous materials is well known to improve the global acoustic performance of the complete system. Such porous materials should be designed in a specific way in order to reach a significant acoustic sealing performance at different compression rates. Unfortunately, there are no standard measurement procedures nor predefined material characteristics that allow the selection of the right material with the optimal acoustic performance. The main goal of this research is to link acoustic performance of compressed porous materials with intrinsic material characteristics using statistical techniques.

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