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and graphitisation lines in 2010 has enabled us to quadruple our throughput and reduce our turnaround time for AMS (now averaging 6 weeks), while maintaining our quality control, improving our background limits and reducing sample size requirements.

Organic samples are converted to COC using an iron catalyst.

The original, and best known, application of AMS is radiocarbon dating, where you are trying to detect the rare isotope A nuclear particle accelerator consists essentially of two linear accelerators joined end-to-end, with the join section (called the terminal) charged to a very high positive potential (3 million volts or higher). Injecting negatively charged carbon ions from the material being analysed into a nuclear particle accelerator based on the electrostatic tandem accelerator principle. The negative ions are accelerated towards the positive potential.

At the terminal they pass through either a very thin carbon film or a tube filled with gas at low pressure (the stripper), depending on the particular accelerator.

This requires sufficient atoms to be present to provide a large enough decay rate, as described above.

The Accelerator Mass Spectrometry (AMS) technique enables small samples to be dated.

Atoms are sputtered from the sample by cesium ions which are produced on a hot spherical ionizer and focused to a small spot on the sample.

accelerator mass spectrometry ams radiocarbon dating-64accelerator mass spectrometry ams radiocarbon dating-71accelerator mass spectrometry ams radiocarbon dating-43

The element is first chemically extracted from the sample (for example, a rock, rain water, a meteorite) then it is loaded into a copper holder and inserted into the ion source through a vacuum lock.Collisions with carbon or gas atoms in the stripper remove several electrons from the carbon ions, changing their polarity from negative to positive. The positive ions are then accelerated through the second stage of the accelerator, reaching kinetic energies of the order of 10 to 30 million electron volts. This problem is solved in the tandem accelerator at the stripper –if three or more electrons are removed from the molecular ions the molecules dissociate into their component atoms. The kinetic energy that had accumulated up to now is distributed among the separate atoms, none of which has the same energy as a single C from the more intense "background" caused by the dissociated molecules on the basis of their kinetic energy.Accelerating the ions to high energy has one more advantage.At the kinetic energies typically used in an AMS system it is possible to use well-established nuclear physics techniques to detect the individual C ions as they arrive at a suitable particle detector.This may be a solid-state detector or a device based on the gridded ionisation chamber.




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