scholarly journals Radiocarbon with Gas Chromatography

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 711-716 ◽  
Author(s):  
Christopher Bronk Ramsey ◽  
R. E. M. Hedges
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Pilot Study ◽  
Accelerator Mass Spectrometry ◽  
Ion Source ◽  
Tracer Studies ◽  
Chemical Fractions ◽  
Peak Sensitivity ◽  
Accelerator System

In 14C tracer studies, and when looking for modern contamination in archaeological samples, it is often necessary to measure the 14C concentration of individual chemical fractions. Gas chromatography (GC) is one method that is frequently used for separation of chemical fractions. The gas ion source at the Oxford Radiocarbon Accelerator Unit for accelerator mass spectrometry (AMS) provides the opportunity to measure fractions from a GC instrument directly. Although the first investigations are likely to be 14C tracer studies, such a GC-AMS system could find much wider application. We present results from a pilot study of the peak sensitivity, baseline stability and crosstalk of the accelerator system used in this way. We also discuss the practical considerations in developing a GC-AMS instrument for routine use.

scholarly journals Technological Advances in the University of Washington Accelerator Mass Spectrometry System

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 755-760 ◽  
Author(s):  
G W Farwell ◽  
P M Grootes ◽  
D D Leach ◽  
F H Schmidt
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Ion Source ◽  
The Past ◽  
Technological Advances ◽  
Recent Developments ◽  
Mass Spectrometry System ◽  
The University ◽  
Preparation Techniques ◽  
Accelerator System

During the past year we have continued to work toward greater stability and flexibility in nearly all elements of our accelerator mass spectrometry (AMS) system, which is based upon an FN tandem Van de Graaff accelerator, and have carried out measurements of 14C/12C and 10Be/9Be isotopic abundance ratios in natural samples. The principal recent developments and improvements in the accelerator system and in our sample preparation techniques for carbon and beryllium are discussed, and the results of a study of 10Be cross-contamination of beryllium samples in the sputter ion source are presented.

scholarly journals Progress at the Seoul National University AMS Facility

Radiocarbon ◽  
2001 ◽  
Vol 43 (2A) ◽  
pp. 163-167 ◽  
Author(s):  
J C Kim ◽  
J H Park ◽  
I C Kim ◽  
C Lee ◽  
M K Cheoun ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Performance Test ◽  
Conventional Technique ◽  
National University ◽  
Mass Spectrometry Facility ◽  
Seoul National University ◽  
Accelerator System

The accelerator mass spectrometry facility at the Seoul National University (SNU-AMS) was completed in December 1998 and a report was presented at the Vienna AMS conference in September 1999. At the conference, we described the basic components of our accelerator system and reported the results of the performance test. Since then, extensive testing of the accuracy and reproducibility of the system has been carried out, and about 200 unknown samples have been measured so far. We obtained a precision of 4‰ for modern samples, and an accuracy of approximately 40 yr was demonstrated by analyzing samples that were previously dated with a conventional technique and by other AMS laboratories. We present these results here, together with detailed descriptions of our data-taking and analysis procedures.

Accelerator mass spectrometry: application to study of aluminum kinetics in the rat

1991 ◽  
Vol 260 (3) ◽  
pp. F466-F469 ◽  
Author(s):  
O. Meirav ◽  
R. A. Sutton ◽  
D. Fink ◽  
R. Middleton ◽  
J. Klein ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Renal Clearance ◽  
Intravenous Injection ◽  
Accelerator Mass Spectrometry ◽  
Ultrasensitive Detection ◽  
Tracer Studies ◽  
Isotope Tracer ◽  
Tracer Dose ◽  
Normal Rat ◽  
Mass Spectrometry Application

The advent of accelerator mass spectrometry (AMS) now permits the ultrasensitive detection of extremely long-lived isotopes, including 14C, 26Al, and 41Ca. Until now, tracer studies of aluminum kinetics have not been possible because aluminum has only two isotopes, with half-lives of 6.5 min (29Al) and 7 x 10(5) yr (26Al), neither of which is suitable for conventional studies. In a novel experiment we have employed AMS to study aluminum kinetics in a normal rat and a 5/6-nephrectomized rat over a 3-wk period of intravenous injection of a tracer dose of 26Al. Kinetics were similar in the two animals; approximately 75% of intravenously injected tracer 26Al was excreted in the urine in the first 24 h as was approximately 80% after 3 wk. Renal clearance of 26Al was approximately 0.75 ml.min-1.kg body wt-1 in both rats. The results clearly demonstrate the potential of this technique for isotope tracer studies in animals as well as in humans.

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%.

A microbeam Cs ion source for accelerator mass spectrometry

1998 ◽  
Vol 69 (3) ◽  
pp. 1353-1358 ◽  
Author(s):  
S. H. Sie ◽  
T. R. Niklaus ◽  
G. F. Suter ◽  
F. Bruhn
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Ion Source

scholarly journals Optimizing a microwave gas ion source for continuous-flow accelerator mass spectrometry

2012 ◽  
Vol 83 (2) ◽  
pp. 02B304 ◽  
Author(s):  
K. F. von Reden ◽  
M. L. Roberts ◽  
J. R. Burton ◽  
S. R. Beaupré
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Continuous Flow ◽  
Ion Source

scholarly journals Using a Gas Ion Source for Radiocarbon AMS and GC-AMS

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Christopher Bronk Ramsey ◽  
Peter Ditchfield ◽  
Martin Humm
Keyword(s):  
Mass Spectrometry ◽  
Carbon Dioxide ◽  
Gas Chromatography ◽  
Continuous Flow ◽  
Direct Injection ◽  
Ion Source ◽  
Handling System ◽  
Peak Separation ◽  
Similar Work ◽  
High Voltage Engineering

This paper reports on the performance of a new method of sample injection using the High Voltage Engineering Europa (HVEE) SO-110 ion source jointly developed between HVEE and Oxford. In order to use this source, we have developed a new gas handling system which works on the direct injection of carbon dioxide mixed into a continuous flow of helium. Preliminary work has also been carried out on online gas chromatography-accelerator mass spectrometry (GC-AMS). In this application, a GC is directly coupled to the AMS system using a GC-IRMS combustion interface and Nafion™ drier. We show here results for the measurement of natural abundance in separated compounds with good peak separation and precisions of about 10%. This type of system should be ideal for source apportionment studies, biomedical, and other similar work where high precision is not required but where sample sizes are very low.

Sign in / Sign up

Export Citation Format

Share Document