scholarly journals Initial Results with Low Energy Single Stage AMS

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 1-4 ◽  
Author(s):  
J B Schroeder ◽  
T M Hauser ◽  
G M Klody ◽  
G A Norton
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Low Energy ◽  
Single Stage ◽  
Particle Detector ◽  
Spherical Analyzer ◽  
Gas Stripper ◽  
Initial Results ◽  
Better Than

The National Electrostatics Corporation has built and tested a prototype low energy, open-air, single stage carbon accelerator mass spectrometry (AMS) system (patent pending). The configuration tested has a standard 40-sample, multi-cathode SNICS source on a 300-kV deck. The beam is mass analyzed before acceleration to a gas stripper located at ground. The 14C+ ions are separated from 13C+ and 12C+ arising from the molecular breakup by a 90° analyzing magnet immediately after the gas stripper which acts as a molecular dissociator. The 14C+ beam passes through an electrostatic spherical analyzer before entering the particle detector. The observed 14C/12C precision is better than 5% with a sensitivity of better than 0.05 dpm/gmC. A first single stage AMS system has been ordered. The configuration of this system will be discussed.

scholarly journals The Radiocarbon Content of Individual Lignin-Derived Phenols: Technique and Initial Results

Radiocarbon ◽  
2000 ◽  
Vol 42 (2) ◽  
pp. 219-227 ◽  
Author(s):  
A P McNichol ◽  
J R Ertel ◽  
T I Eglinton
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Phenolic Compounds ◽  
Accelerator Mass Spectrometry ◽  
Bulk Material ◽  
Polymeric Materials ◽  
Chemical Oxidation ◽  
Flavor Compounds ◽  
The Individual ◽  
Initial Results

We present a method for the isolation of phenolic compounds derived from lignin for radiocarbon analysis. These phenols are generated by chemical oxidation of polymeric materials and derivatized for separation and recovery by preparative capillary gas chromatography (PCGC). This technique yields tens of micrograms of pure, stable compounds that can be converted to graphite and analyzed by accelerator mass spectrometry (AMS). Analysis of model flavor compounds and dated woods indicates that, in most cases, the radiocarbon (14C) contents of the individual compounds, corrected for the contribution of the derivative, agree with that of the bulk material to within 20%.

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 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 A High-Throughput, Low-Cost Method for Analysis of Carbonate Samples for 14C

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 585-592 ◽  
Author(s):  
Mark L Roberts ◽  
Steven R Beaupré ◽  
Joshua R Burton
Keyword(s):  
Mass Spectrometry ◽  
Cost Analysis ◽  
High Throughput ◽  
Accelerator Mass Spectrometry ◽  
Organic Material ◽  
Low Cost ◽  
Automated System ◽  
Woods Hole Oceanographic Institution ◽  
Ocean Sciences ◽  
Better Than

The National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility at the Woods Hole Oceanographic Institution has developed an automated system for high-throughput, low-cost analysis of radiocarbon in carbonate samples (e.g. corals, carbonaceous sediments, speleothems, etc.). The method bypasses graphitization and pretreatment, and reduces costs to about 1/5th the price of a graphite-based 14C carbonate analysis, with a throughput of 60 unknowns per day and an analytical precision of better than 2%. Additionally, a simple mixing experiment indicated that extensive cleaning of carbonate samples to remove organic material is not necessary.

Heavy element analysis by low energy accelerator mass spectrometry

1989 ◽  
Vol 40-41 ◽  
pp. 745-749 ◽  
Author(s):  
L.R. Kilius ◽  
M.A. Garwan ◽  
A.E. Litherland ◽  
M-J. Nadeau ◽  
J.C. Rucklidge ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Heavy Element ◽  
Low Energy ◽  
Element Analysis
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