scholarly journals Operation of the NSF-Arizona Accelerator Facility for Radioisotope Analysis and Results from Selected Collaborative Research Projects

Radiocarbon ◽  
1986 ◽  
Vol 28 (2A) ◽  
pp. 522-533 ◽  
Author(s):  
T W Linick ◽  
A J T Jull ◽  
L J Toolin ◽  
D J Donahue
Keyword(s):  
Collaborative Research ◽  
Radiocarbon Dating ◽  
Research Projects ◽  
Tandem Accelerator ◽  
Accelerator Facility ◽  
Modern Material ◽  
Sea Floor ◽  
Peruvian Coast ◽  
Accelerator Mass Spectrometer ◽  
Activity Ratios

Radiocarbon dating at the Arizona accelerator facility has improved substantially in the last three years. Since starting to use graphite targets (see Jull et al, 1986), we have been able to obtain routinely a precision of ca ± 1% (ca 80 yr) for relatively modern material. Our routine technique of tuning and operating the tandem accelerator mass spectrometer (TAMS) and our method of calculating 14C results are discussed in detail. Data on activity ratios of oxalic acid-II/oxalic-I are presented. Examples of the wide variety of projects on which we have collaborated are given. Brief discussions of three such projects are presented for our colleagues who were unable to attend this conference: an Arizona Indian archaeologic project, a study of megafaunal extinctions, and a study of the growth of phosphorite nodules on the sea floor off the Peruvian coast.

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.

scholarly journals 14C AMS at Suerc: Improving QA Data with the 5MV Tandem and 250KV SSAMS

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 263-271 ◽  
Author(s):  
P Naysmith ◽  
G T Cook ◽  
S P H T Freeman ◽  
E M Scott ◽  
R Anderson ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Sample Preparation ◽  
Mass Spectrometer ◽  
Random Access ◽  
Capacity Measurement ◽  
Tandem Accelerator ◽  
Standard Data ◽  
Accelerator Mass Spectrometer ◽  
On Line ◽  
Automated Data Acquisition

In 2003, a National Electrostatics Corporation (NEC) 5MV tandem accelerator mass spectrometer was installed at SUERC, providing the radiocarbon laboratory with 14C measurements to 4–5‰ repeatability. In 2007, a 250kV single-stage accelerator mass spectrometer (SSAMS) was added to provide additional 14C capability and is now the preferred system for 14C analysis. Changes to the technology and to our operations are evident in our copious quality assurance data: typically, we now use the 134-position MC-SNICS source, which is filled to capacity. Measurement of standards shows that spectrometer running without the complication of on-line δ13C evaluation is a good operational compromise. Currently, 3‰ 14C/13C measurements are routinely achieved for samples up to nearly 3 half-lives old by consistent sample preparation and an automated data acquisition algorithm with sample random access for measurement repeats. Background and known-age standard data are presented for the period 2003–2008 for the 5MV system and 2007–2008 for the SSAMS, to demonstrate the improvements in data quality.

Use of dual foil stripping at the Brookhaven tandem accelerator facility for improved heavy-ion performance

1974 ◽  
Vol 122 ◽  
pp. 291-293 ◽  
Author(s):  
P. Thierberger ◽  
H.E. Wegner ◽  
M. McKeown ◽  
M. Manni ◽  
I. Feigenbaum
Keyword(s):  
Heavy Ion ◽  
Tandem Accelerator ◽  
Accelerator Facility

scholarly journals (Not So) Dangerous Liaisons: A Framework for Evaluating Collaborative Research Projects

2017 ◽  
Vol VIII (Special) ◽  
pp. 167-179
Author(s):  
Pinar Oztop ◽  
Frank Loesche ◽  
Diego Maranan ◽  
Kathryn Francis ◽  
Vaibhav Tyagi ◽  
...  
Keyword(s):  
Collaborative Research ◽  
Research Projects

Computational Grids

2010 ◽  
pp. 152-163
Author(s):  
Ribhi Hazin ◽  
Ibrahim Qaddoumi ◽  
Francisco Pedrosa
Keyword(s):  
Brain Tumors ◽  
Grid Computing ◽  
Collaborative Research ◽  
Medical Images ◽  
Statistical Analyses ◽  
Computational Grids ◽  
Research Projects ◽  
Delivery Of Care ◽  
The World ◽  
As If

A network of interconnected computers, or “computational grids,” can facilitate the ability of users to complete complex computational tasks that would be virtually impossible with a single computer. By leveraging the computational strength of grids, individual users can efficiently disseminate, exchange, and retrieve information as easily as if it were stored locally. As the authors found in this study, the possibilities computational grids present for highly specialized medical fields such as neuro-oncology are limitless. By harnessing the power of grids, neuro-oncologists can link to sophisticated interactive medical images around the world, perform complicated statistical analyses, create larger collaborative research projects, and improve delivery of care to patients around the globe. Thus, utilization of grid computing modules will inevitably lead to marked improvements in clinicians’ ability to detect, manage, and prevent complications associated with brain tumors.

Sign in / Sign up

Export Citation Format

Share Document