scholarly journals AMS-Graphite Target Production Methods at the Woods Hole Oceanographic Institution During 1986–1991

Radiocarbon ◽  
1993 ◽  
Vol 35 (2) ◽  
pp. 301-310 ◽  
Author(s):  
Alan R. Gagnon ◽  
Glenn A. Jones
Keyword(s):  
Woods Hole Oceanographic Institution ◽  
Graphite Target ◽  
Accelerator Facility ◽  
Target Preparation ◽  
Production Methods ◽  
University Of Arizona ◽  
Closed Tube ◽  
Target Production ◽  
The University ◽  
Careful Documentation

In July 1986, an AMS radiocarbon target preparation laboratory was established at the Woods Hole Oceanographic Institution to produce graphite to be analyzed at the NSF-Accelerator Facility for Radioisotope Analysis at the University of Arizona (Tucson). By June 1991, 923 graphite targets had been prepared and 847 analyzed. Our lab procedures during this time included the careful documentation of weights of all starting samples, catalysts and final graphite yields, as well as the volume of CO2 gas evolved during CaCO3 hydrolysis or closed-tube organic carbon combustions. From these data, we evaluate the methods used in general and in our lab.

scholarly journals Timothy W Linick October 29, 1946–June 4, 1989

Radiocarbon ◽  
1989 ◽  
Vol 31 (2) ◽  
pp. iii-iii
Author(s):  
Ajt Jull ◽  
Hans E Suess
Keyword(s):  
Tree Ring ◽  
Time Scale ◽  
Accelerator Facility ◽  
Radiocarbon Dates ◽  
University Of Arizona ◽  
The University

Timothy Weiler Linick died on June 4th, 1989. He was a dedicated researcher, and an important part of the NSF Accelerator Facility for Radioisotope Analysis at the University of Arizona. He will be remembered for his care and attention to details, especially in the calculation and reporting of radiocarbon dates. He made important contributions to the fields of oceanography and tree-ring calibration of the 14C time scale.

scholarly journals Study of Bone Radiocarbon Dating Accuracy at the University of Arizona NSF Accelerator Facility for Radioisotope Analysis

Radiocarbon ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 24-44 ◽  
Author(s):  
Thomas W Stafford ◽  
A J T Jull ◽  
Klaus Brendel ◽  
Raymond C Duhamel ◽  
Douglas Donahue
Keyword(s):  
Radiocarbon Dating ◽  
Fossil Bone ◽  
Accelerator Facility ◽  
University Of Arizona ◽  
Accelerator Mass Spectrometer ◽  
Calcified Tissue ◽  
The University ◽  
Original Organic Matter ◽  
Age Determinations ◽  
The Ideal

Bone would seem to be an ideal material for14C dating because this calcified tissue contains 20 weight per cent protein. Fossil bone, however, can lose most of its original organic matter and frequently contains contaminants having different14C ages. Numerous14C dates on bone have been available to archaeologists and geologists but many age determinations have been inaccurate despite over 30 years of research in the field following the first14C age determinations on bone (Arnold & Libby, 1951). This situation remained unchanged until simple pretreatments were abandoned and more bone-specific fractions were isolated. The ideal solution is to use accelerator mass spectrometer14C dating, which facilitates the use of milligram-sized amounts of highly purified compounds—an approach impossible to pursue using conventional14C decay-counting methods.

scholarly journals Results of Tests and Measurements from the Nsf Regional Accelerator Facility for Radioisotope Dating

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 719-728 ◽  
Author(s):  
D J Donahue ◽  
T H Zabel ◽  
A J T Jull ◽  
P E Damon ◽  
K H Purser
Keyword(s):  
Mass Spectrometer ◽  
Tree Rings ◽  
Tandem Accelerator ◽  
Accelerator Facility ◽  
Tests And Measurements ◽  
University Of Arizona ◽  
Accelerator Mass Spectrometer ◽  
The University

Tests of performance of the tandem accelerator mass spectrometer at the NSF Regional Facility at the University of Arizona are discussed. Results of measurements on some tree rings and on some archaeologic samples are presented.

RADIOCARBON IN MEXICO: FROM PROPORTIONAL COUNTERS TO AMS

Radiocarbon ◽  
2021 ◽  
pp. 1-7
Author(s):  
Corina Solís ◽  
Efraín Chávez ◽  
Arcadio Huerta ◽  
María Esther Ortiz ◽  
Alberto Alcántara ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Sample Preparation ◽  
High Voltage ◽  
Accelerator Mass Spectrometry ◽  
Science And Technology ◽  
National Council ◽  
University Of Arizona ◽  
Technological Developments ◽  
High Voltage Engineering ◽  
The University

ABSTRACT Augusto Moreno is credited with establishing the first radiocarbon (14C) laboratory in Mexico in the 1950s, however, 14C measurement with the accelerator mass spectrometry (AMS) technique was not achieved in our country until 2003. Douglas Donahue from the University of Arizona, a pioneer in using AMS for 14C dating, participated in that experiment; then, the idea of establishing a 14C AMS laboratory evolved into a feasible project. This was finally reached in 2013, thanks to the technological developments in AMS and sample preparation with automated equipment, and the backing and support of the National Autonomous University of Mexico and the National Council for Science and Technology. The Mexican AMS Laboratory, LEMA, with a compact 1 MV system from High Voltage Engineering Europa, and its sample preparation laboratories with IonPlus automated graphitization equipment, is now a reality.

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