INTER-UNIVERSITY ACCELERATOR CENTRE, NEW DELHI (IUACD) RADIOCARBON DATE LIST II

Radiocarbon ◽  
2021 ◽  
pp. 1-31
Author(s):  
Rajveer Sharma ◽  
Pankaj Kumar ◽  
Sunil Ojha ◽  
Satinath Gargari ◽  
Sundeep Chopra
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Date ◽  
New Delhi ◽  
Cosmogenic Radionuclide ◽  
Pelletron Accelerator

ABSTRACT Accelerator mass spectrometry (AMS) activities at the Inter-University Accelerator Centre (IUAC) in New Delhi, India, started with its 15UD Pelletron accelerator and cosmogenic radionuclide (CRN) measurements of 10Be and 26Al. Realizing the demand of a radiocarbon (14C) AMS facility in India, a 500kV Pelletron accelerator based AMS system was installed in 2015. This facility was designated with the lab code IUACD for 14C measurements. 14C dates measured in 2015 and 2016 were published in the first radiocarbon date list (see text for details). The present list is the second 14C date list and consists of dates measured from January to December 2017.

INTER-UNIVERSITY ACCELERATOR CENTRE, NEW DELHI (IUACD) RADIOCARBON DATE LIST I

Radiocarbon ◽  
2020 ◽  
Vol 62 (5) ◽  
pp. e1-e13
Author(s):  
Rajveer Sharma ◽  
Pankaj Kumar ◽  
Sunil Ojha ◽  
Satinath Gargari ◽  
Sundeep Chopra
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Background Level ◽  
New Delhi ◽  
Handling System ◽  
Carbon Sample ◽  
New Facility ◽  
Pelletron Accelerator ◽  
Better Than

ABSTRACTA new facility for radiocarbon dating by accelerator mass spectrometry (AMS) was established in early 2015 at the Inter-University Accelerator Centre in New Delhi, India. The facility uses a 500 kV National Electrostatic Corporation (NEC) Pelletron accelerator for AMS measurements on graphite produced using the automated graphitization equipment (AGE) interfaced with an elemental analyzer and the carbonate handling system (CHS). A precision of better than 1‰ in the ratio of 14C/12C for the modern carbon sample and the background level of 1 × 10–15 from dead carbon sample has been achieved. This is the first dedicated accelerator of India only for AMS activities. This AMS system has the capabilities to perform 10Be and 26Al measurements as well.

scholarly journals Tree-Ring Dating and AMS Wiggle-Matching of Wooden Statues at Neunggasa Temple in South Korea

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 924-932 ◽  
Author(s):  
Won-Kyu Park ◽  
Yojung Kim ◽  
Ah-Reum Jeong ◽  
Sang-Kyu Kim ◽  
Jung-Ae Oh ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Confidence Interval ◽  
South Korea ◽  
Tree Ring ◽  
Tree Rings ◽  
Accelerator Mass Spectrometry ◽  
Early Spring ◽  
Radiocarbon Date ◽  
Historical Document ◽  
Natural Drying

This paper reports the results of tree-ring dating and accelerator mass spectrometry (AMS) wiggle-matching for wooden Buddhist statues stored at the Eungjindang Hall of Neunggasa Temple, South Korea. Among 23 statues, 10 were successfully dated by tree rings. The cutting date of logs used for the statues was determined as some time between late fall 1684 and early spring 1685 when the bark ring (AD 1684) completed latewood formation. The 95.4% confidence interval of a radiocarbon date (cal AD 1688–1713, 2 σ), which was obtained by wiggle-matching 7 samples of a statue, is similar to the dendro-date (AD 1684). A historical document recorded that the statues in the Eungjindang of Neunggasa were dedicated in July 1685. The dendro-date and written record indicate that Eungjindang statues were made within 3–8 months after log cutting. This seems rather short if we consider the period required for natural drying to avoid defects such as cracking and crooking.

scholarly journals A Partial Bison (Bison cf. B. latifrons) Skeleton from Chuchi Lake, and its Implications for the Middle Wisconsinan Environment of Central British Columbia

2007 ◽  
Vol 50 (1) ◽  
pp. 73-80 ◽  
Author(s):  
C. Richard Harington ◽  
Alain Plouffe ◽  
Hélène Jetté
Keyword(s):  
Mass Spectrometry ◽  
British Columbia ◽  
Accelerator Mass Spectrometry ◽  
Bison Bison ◽  
Radiocarbon Date ◽  
Open Forest ◽  
Shrub Tundra ◽  
Left And Right

ABSTRACT Fragmentary but massive left and right horncores, found with eight post-cranial bones, from a clay unit underlying a diamicton of the last (Fraser) glaciation at Chuchi Lake, British Columbia probably represents an individual giant bison (Bison cf. B. latifrons). A sample of bone from one of the horncores yielded an accelerator mass spectrometry (AMS) radiocarbon date of 30 740 ± 220 BP, whereas overlapping dates from two other laboratories on an associated humerus are 34 800 ± 420 BP and 35 480 ± 1080 BP. Despite the discrepancy between horncore and humerus dates, they are in accord with the suspected stratigraphie age of the clay unit whence they came. Analysis of pollen from that clay unit indicates that bison with massive horns once occupied an open forest in the vicinity. Probably giant bison and Columbian mammoths (incorporating paleoenvironmental evidence found with the nearby, penecontemporaneous Babine Lake mammoth) shared lake-dotted open forest to shrub tundra range in what is now central British Columbia toward the close of the Middle Wisconsinan (Olympia Nonglacial Interval). The Chuchi Lake specimen is important because it is the first indication of giant bison from British Columbia, and it appears to be one of the latest known survivors of this species.

scholarly journals The Antiquity of the Prehistoric Settlement of the Central-South Brazilian Coast

Radiocarbon ◽  
2002 ◽  
Vol 44 (3) ◽  
pp. 733-738 ◽  
Author(s):  
T A Lima ◽  
K D Macario ◽  
R M Anjos ◽  
P R S Gomes ◽  
M M Coimbra ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Rio De Janeiro ◽  
Radiocarbon Date ◽  
Brazilian Coast ◽  
Unexpected Result ◽  
Southern Coast ◽  
Central South

We discus here the prehistoric settlement of the central-south Brazilian coast, and, more specifically, 1 old radiocarbon date obtained for a costal shellmound, as well as its implications concerning the chronology attributed to the settlement process. The accelerator mass spectrometry (AMS) technique was used to determine the 14C age of charcoal from a shellmound on the southern coast of Rio de Janeiro. The resulting age was 7860 ± 80 BP, an unexpected result that reinforces 2 similar previously obtained dates for the same region. Brazilian archaeologists, however, have questioned those 2 dates, because they would predate by some 2000 yr the antiquity consensually accepted for the settlement of the central-south Brazilian littoral.

NEW AMS 14C DATES OF A MULTICULTURAL ARCHAEOLOGICAL SITE FROM THE PALEO-DELTAIC REGION OF WEST BENGAL, INDIA: CULTURAL AND GEO-ARCHAEOLOGICAL IMPLICATIONS

Radiocarbon ◽  
2021 ◽  
pp. 1-11
Author(s):  
Nabanita Naskar ◽  
Kaushik Gangopadhyay ◽  
Susanta Lahiri ◽  
Punarbasu Chaudhuri ◽  
Rajveer Sharma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Late Holocene ◽  
West Bengal ◽  
Archaeological Site ◽  
Humid Tropics ◽  
Age Dating ◽  
New Delhi ◽  
Absolute Age ◽  
Calendar Dates

ABSTRACT This study is on the absolute age dating of a multicultural site of Erenda, East Medinipur district, in coastal West Bengal, India. Charcoal samples were collected and measured using the accelerator mass spectrometry (AMS) facility at the Inter-University Accelerator Centre, New Delhi, India. These samples were collected from secured stratigraphic context of two excavated trenches. A careful collection of samples from two trenches provided us with the first calendar dates, 950 BCE and 1979 BCE, of protohistoric sites in coastal West Bengal. These calibrated calendar dates not only have wider significance in terms of archaeology but also methodological implications to understand the relevance of application of AMS from the dynamic coastal landscape in the humid tropics during the late Holocene period.

Accelerator radiocarbon date confirms early deglaciation of the Queen Charlotte Islands

1985 ◽  
Vol 22 (5) ◽  
pp. 790-791 ◽  
Author(s):  
Rolf W. Mathewes ◽  
J. S. Vogel ◽  
J. R. Southon ◽  
D. E. Nelson
Keyword(s):  
Mass Spectrometry ◽  
British Columbia ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Date ◽  
Queen Charlotte Islands

Accelerator mass spectrometry was used to test whether part of eastern Graham Island was ice free at the height of late Wisconsin glaciation on mainland British Columbia. An accelerator radiocarbon date of 14 700 ± 700 years on a small twig conforms with two conventional dates that suggested that the Cape Ball region of Graham Island was deglaciated by about 15 000 radiocarbon years ago.

scholarly journals Accelerator Mass Spectrometry at the Lund Pelletron Accelerator

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 468-472 ◽  
Author(s):  
Göran Skog ◽  
Ragnar Hellborg ◽  
Bengt Erlandsson
Keyword(s):  
Mass Spectrometry ◽  
Energy Loss ◽  
Mass Spectroscopy ◽  
Accelerator Mass Spectrometry ◽  
Elemental Carbon ◽  
Initial Period ◽  
High Energy ◽  
Particle Energy ◽  
Quaternary Geology ◽  
Pelletron Accelerator

Three years ago, funds were raised to equip the 3 MV Pelletron accelerator at the Department of Physics, Lund University for accelerator mass spectroscopy (AMS). We have modified the accelerator for mass spectroscopy by relocating focusing devices on both the low- and high-energy side of the accelerator and installing a Wien velocity filter and detectors for measuring the particle energy (E) and energy loss (ΔE). We have been working exclusively with 14C during the initial period. About 40 samples of elemental carbon have been produced, using Fe or Co as catalyst, during the last two years. The 12C− current from these samples is about 3–5 μA using an ANIS sputtering source. We are now planning 14C analyses in the fields of archaeology, Quaternary geology and radioecology.

scholarly journals 14C Dating of the Upper Paleolithic Site at Krems-Hundssteig in Lower Austria

Radiocarbon ◽  
2008 ◽  
Vol 50 (1) ◽  
pp. 1-10 ◽  
Author(s):  
E M Wild ◽  
C Neugebauer-Maresch ◽  
T Einwögerer ◽  
P Stadler ◽  
P Steier ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Archaeological Site ◽  
Upper Paleolithic ◽  
Radiocarbon Date ◽  
Cultural Layer ◽  
Archaeological Remains ◽  
14C Dating ◽  
Paleolithic Site

The open-air archaeological site at Krems-Hundssteig is a well-known Upper Paleolithic site located in Lower Austria. The site was discovered in the late 19th/early 20th centuries when a large number of archaeological remains were collected during the course of loess quarrying. Although no systematic excavation has ever been performed, Krems-Hundssteig has been described since its discovery as typical of the Aurignacian period in this region based on the numerous archaeological finds; accordingly, the culture has been named Kremsien by some authors. Surprisingly, the artifacts found in a recent excavation adjacent to this location showed solely Gravettian features, calling into question the original assignment to the Aurignacian. Although the earlier assignment was supported by a radiocarbon date of ∼35 kyr BP (Hahn 1977), new accelerator mass spectrometry (AMS) 14C dates proved that the recently excavated cultural layer originates from the Gravettian period. Older paleosols were also detected by sondage drillings at some depth below it.The new results indicate that a large Aurignacian level and a substantial complex of Gravettian layers are present in this area. Therefore, it must be assumed that more than 1 cultural level was affected and destroyed by the historic loess quarrying, and that the assemblage of Krems-Hundssteig artifacts, traditionally ascribed to the Aurignacian, might be interspersed with Gravettian pieces.

Present Status of YU-AMS System

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 251-259 ◽  
Author(s):  
Fuyuki Tokanai ◽  
Kazuhiro Kato ◽  
Minoru Anshita ◽  
Hirohisa Sakurai ◽  
Akihiro Izumi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Sample Preparation ◽  
Tree Rings ◽  
Accelerator Mass Spectrometry ◽  
Present Status ◽  
Calibration Data ◽  
Performance Tests ◽  
Standard Samples ◽  
Control Serum ◽  
Pelletron Accelerator

A new compact accelerator mass spectrometry (AMS) system has been installed in the Kaminoyama Research Institute at Yamagata University (YU). The AMS system is based on a 0.5MV Pelletron accelerator developed by the National Electrostatics Corporation. An automated acid-alkali-acid (AAA) treatment system and an automated graphitization line were also installed in the same facility for sample preparation. Performance tests of the YU-AMS system were carried out by measuring the C-series standard samples (C1–C8) and HOxII provided by IAEA and NIST, respectively. We evaluated the YU-AMS system by comparing the radiocarbon ages of Japanese tree rings with dendrochronologically determined calendar ages with calibration data. We also carried out some performance tests using a control serum and a 14C-labeled drug (oxaliplatin).

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