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.

Radiocarbon dating by accelerator mass spectrometry: some recent results and applications

1987 ◽  
Vol 323 (1569) ◽  
pp. 57-73 ◽  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Chemical Compounds ◽  
Environmental Research ◽  
Specific Chemical ◽  
Archaeological Material ◽  
Comparable Accuracy ◽  
Different Sources ◽  
Better Than

14 C differs from other nuclides measured by accelerator mass spectrometry (AMS) in that an extensive database of dates already exists, AMS dates should therefore have comparable accuracy, and the measurement of isotopic ratios to better than 1 % , which was an important technical goal, has been reached. The main advantage of being able to date samples 1000 times smaller than previously lies in the extra selectivity that can be employed. This is reflected in the results and applications. Selection can apply at several levels; from objects th at formerly contained too little carbon, to the choice of archaeological material, to the extraction of specific chemical compounds from a complex environmental sample. This is particularly useful in removing uncertainty regarding the validity of a date, since a given sample may comprise carbon atoms from different sources each with their own 14 C ‘age’. Examples from archaeological and environmental research illustrating these points are given. 14 C dating by AMS differs from conventional radiocarbon dating by having the potential to measure much lower levels of 14 C, and therefore should double the time span of the method. This potential has not yet been realized because of sample contamination effects, and work in progress to reduce these is described.

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.

scholarly journals AMS Radiocarbon Dating of Bones at LSCE

Radiocarbon ◽  
2003 ◽  
Vol 45 (3) ◽  
pp. 409-419 ◽  
Author(s):  
N Tisnérat-Laborde ◽  
H Valladas ◽  
E Kaltnecker ◽  
M Arnold
Keyword(s):  
Mass Spectrometry ◽  
Amino Acids ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Total System ◽  
Sample Mass ◽  
Specific Reaction ◽  
Ams Radiocarbon Dating ◽  
Carbon Sample

In this paper, we explain our routine pretreatment of bone for radiocarbon dating by accelerator mass spectrometry (AMS), based on the specific reaction between amino acids and ninhydrin described by Nelson (1991). The values and uncertainties of the total system background are presented as a function of the carbon sample mass and the reliability of this method is discussed.

scholarly journals 14C Wiggle-Matching of the B-Tm Tephra, Baitoushan Volcano, China/North Korea

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 933-940 ◽  
Author(s):  
Shinya Yatsuzuka ◽  
Mitsuru Okuno ◽  
Toshio Nakamura ◽  
Katsuhiko Kimura ◽  
Yohei Setoma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
North Korea ◽  
Radiocarbon Dating ◽  
Gas Emission ◽  
Volcanic Gas ◽  
Ams Radiocarbon Dating ◽  
Eruption Age ◽  
The Difference ◽  
Volcanic Gas Emission

We performed accelerator mass spectrometry (AMS) radiocarbon dating and wiggle-matching of 2 wood samples from charred trunks of trees (samples A and B) collected from an ignimbrite deposit on the northeastern slope of the Baitoushan Volcano on the border of China and North Korea. The obtained calendar years for the eruption are cal AD 945–960 for sample A and cal AD 859–884 and cal AD 935–963 for sample B in the 2-σ range. These results are unable to determine the precise eruption age. The reason for the difference in reported ages may be due to volcanic gas emission prior to the huge eruption.

scholarly journals A Protocol for Radiocarbon Dating Tropical Subfossil Cave Guano

Radiocarbon ◽  
2009 ◽  
Vol 51 (3) ◽  
pp. 977-986 ◽  
Author(s):  
Christopher M Wurster ◽  
Michael I Bird ◽  
Ian Bull ◽  
Charlotte Bryant ◽  
Philippa Ascough
Keyword(s):  
Mass Spectrometry ◽  
Southeast Asia ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Saturated Hydrocarbon ◽  
Lipid Fraction ◽  
Bulk Sample ◽  
Radiocarbon Dates ◽  
Organic Fractions ◽  
Age Determinations

We present accelerator mass spectrometry (AMS) radiocarbon dates on several organic fractions isolated from tropical guano deposits recovered from insular Southeast Asia. Differences were observed between 14C measurements made on bulk guano as well as bulk lipids, the saturated hydrocarbon fraction, solvent-extracted guano, and insect cuticles extracted from the same bulk sample. We infer that 14C dates from the bulk lipid fraction and saturated hydrocarbon fractions can be variably contaminated by exogenous carbon. In contrast, 14C measurements on solvent-extracted guano and isolated insect cuticles appear to yield the most robust age determinations.

scholarly journals Radiocarbon Dating of Fourteen Dead Sea Scrolls

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 843-849 ◽  
Author(s):  
Georges Bonani ◽  
Susan Ivy ◽  
Willy Wölfli ◽  
Magen Broshi ◽  
Israel Carmi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Old Testament ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Dead Sea Scrolls ◽  
Dead Sea ◽  
Direct Information ◽  
Western Shore ◽  
The Dead

The name Dead Sea Scrolls refers to some 1200 manuscripts found in caves in the hills on the western shore of the Dead Sea during the last 45 years. They range in size from small fragments to complete books from the holy scriptures (the Old Testament). The manuscripts also include uncanonized sectarian books, letters and commercial documents, written on papyrus and parchment. In only a few cases, direct information on the date of writing was found in the scrolls. In all other cases, the dating is based on indirect archaeological and paleographical evidence. To check this evidence, radiocarbon ages of 14 selected scrolls were determined using accelerator mass spectrometry. The calibrated radiocarbon ages agree well, except in one case, with the paleographic estimates or the specific dates noted on the scrolls.

scholarly journals Prime Lab: A Dedicated AMS Facility at Purdue University

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 447-451 ◽  
Author(s):  
David Elmore ◽  
F. A. Rickey ◽  
P. C. Simms ◽  
M. E. Lipschutz ◽  
K. A. Mueller ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Full Range ◽  
Planetary Science ◽  
Research Projects ◽  
Cosmogenic Radionuclides ◽  
The Earth ◽  
First Results ◽  
Purdue University ◽  
New Facility

A new facility for accelerator mass spectrometry has been established at Purdue University. First results have been obtained for 10Be and 36C1, and several internal research projects have been initiated. Plans are to become a national AMS facility to serve the Earth and planetary science communities for the full range of cosmogenic radionuclides.

scholarly journals AMS Radiocarbon Dating of Tianma-Qucun Site in Shanxi, China

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 1109-1114 ◽  
Author(s):  
Zhiyu Guo ◽  
Kexin Liu ◽  
Xiangyang Lu ◽  
Hongji Ma ◽  
Kun Li ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Bayesian Analysis ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Lower Boundary ◽  
Historical Record ◽  
Shanxi Province ◽  
Ams Radiocarbon Dating ◽  
Western Zhou ◽  
Calibration Program

Tianma-Qucun is the biggest site of Western Zhou Dynasty discovered in Shanxi Province, China. It has been recognized as the early capital of Jin, a vassal state of Western Zhou. The territories were granted to the first Marquis of Jin with the title in the early days of Western Zhou. Bone sample series from the site were radiocarbon-dated by accelerator mass spectrometry (AMS) and calibrated with the Oxford calibration program OxCal 3.5. Bayesian analysis of the calibrated ages shows that the earliest residents of the Western Zhou came to Tianma-Qucun area in 1020–940 BC and the lower boundary of the Western Zhou is 796–754 BC, which corresponds well to the historical record 770 BC.

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