scholarly journals The 3MV Multi-Element AMS in Xi'an, China: Unique Features and Preliminary Tests

Radiocarbon ◽  
2006 ◽  
Vol 48 (2) ◽  
pp. 285-293 ◽  
Author(s):  
Weijian Zhou ◽  
Xiaolei Zhao ◽  
Lu Xuefeng ◽  
Liu Lin ◽  
Wu Zhengkun ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Ion Source ◽  
Point Of View ◽  
Low Energy ◽  
Accelerator Mass Spectrometer ◽  
Acceleration Tube ◽  
Tube Structure

A 3MV multi-element accelerator mass spectrometer (AMS) has been installed in Xi'an, China, and preliminary tests have been completed. The results of both background and precision tests for 4 nuclides are 3.1 × 10–16, 0.2% (14C); 1.8 × 10–14, 1.4% (10Be); 2.3 × 10–15, 1.14% (26Al); and 2.0 × 10–14, 1.75% (129I). The unique features of this facility are the newly developed ion source accepting solid and CO2 samples; the specially designed low-energy injector, including a “beam blanking unit” and “Q-snout”; the acceleration tube structure with the combined magnetic and electrostatic suppression; and the function of the slit stabilization in the post-acceleration system. These features are discussed in terms of the end-user's point of view.

scholarly journals Measurement of 14C Directly from CO2 Using a Tandetron Accelerator Mass Spectrometer Facility

Radiocarbon ◽  
1986 ◽  
Vol 28 (2A) ◽  
pp. 211-214 ◽  
Author(s):  
G M Raisbeck ◽  
Françoise Yiou ◽  
Maurice Arnold ◽  
J C Duplessy
Keyword(s):  
Memory Effect ◽  
Mass Spectrometer ◽  
Point Of View ◽  
Minimum Quantity ◽  
Equivalent Age ◽  
Single Thread ◽  
Accelerator Mass Spectrometer ◽  
Mass Spectrometer System ◽  
Spectrometer System

Tests have been carried out on the measurement of 14C directly from CO2, using a source designed by Middleton, and a Tandetron accelerator mass spectrometer system. These tests were very promising from the point of view of minimum quantity of carbon necessary (<50μg), but suffered from a background (apparently not memory effect) giving an equivalent age of ∼25,000 years. As a demonstration of the technique, a single thread from the mummy wrapping of the Egyptian king Ramses II was dated.

Super Sims for Ultrasensitive Impurity Analysis

1986 ◽  
Vol 69 ◽  
Author(s):  
J. M. Anthony ◽  
D. J. Donahue ◽  
A. J. T. Jull
Keyword(s):  
Mass Spectrometer ◽  
Ion Source ◽  
Particle Accelerator ◽  
Particle Identification ◽  
Radioactive Isotopes ◽  
Tandem Accelerator ◽  
Accelerator Mass Spectrometer ◽  
Source Contamination ◽  
Stable Elements ◽  
Current Detection

AbstractThe technique of accelerator mass spectrometry has been used extensively in recent years as a method for detecting low levels (< 1 part per trillion atomic) of radioactive isotopes in solid materials. The technique consists of a Secondary Ion Mass Spectrometer (SIMS) system in which the conventional mass spectrometer has been replaced by a particle accelerator. We have applied this method to the study of stable elements, primarily semiconductor dopants, using the Univ. of Arizona tandem accelerator mass spectrometer. The use of tandem accelerators allows molecular interferences to be removed due to dissociation of the molecules. Particle energies of several MeV are produced, and energy spectroscopy removes the background due to scattered particles, detector noise, etc. to provide positive particle identification. The current detection limits (-10 parts per billion atomic) are primarily due to ion source contamination and their origin is discussed. Removal of this contamination will allow parts per trillion level detection of stable elements.

scholarly journals Online 13C and 14C Gas Measurements by EA-IRMS–AMS at ETH Zürich

Radiocarbon ◽  
2016 ◽  
Vol 59 (3) ◽  
pp. 893-903 ◽  
Author(s):  
Cameron P McIntyre ◽  
Lukas Wacker ◽  
Negar Haghipour ◽  
Thomas M Blattmann ◽  
Simon Fahrni ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Global Carbon Cycle ◽  
Ion Source ◽  
Data Sets ◽  
Accelerator Mass Spectrometer ◽  
Mass Spectrometer System ◽  
Gas Measurements ◽  
Rich Data ◽  
Spectrometer System ◽  
Global Carbon

AbstractStudies using carbon isotopes to understand the global carbon cycle are critical to identify and quantify sources, sinks, and processes and how humans may impact them. 13C and 14C are routinely measured individually; however, there is a need to develop instrumentation that can perform concurrent online analyses that can generate rich data sets conveniently and efficiently. To satisfy these requirements, we coupled an elemental analyzer to a stable isotope mass spectrometer and an accelerator mass spectrometer system fitted with a gas ion source. We first tested the system with standard materials and then reanalyzed a sediment core from the Bay of Bengal that had been analyzed for 14C by conventional methods. The system was able to produce %C, 13C, and 14C data that were accurate and precise, and suitable for the purposes of our biogeochemistry group. The system was compact and convenient and is appropriate for use in a range of fields of research.

scholarly journals Sputter negative ion source at BINP accelerator mass spectrometer

2018 ◽  
Author(s):  
E. Konstantinov ◽  
A. Goncharov ◽  
S. Konstantinov ◽  
A. Petrozhitsky ◽  
V. Parkhomchuk ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Ion Source ◽  
Negative Ion ◽  
Accelerator Mass Spectrometer

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.

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