accelerator mass spectrometry


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accelerator mass spectrometry

A specialised form of mass spectrometry used for low-level analysis of 14C isotopes in radiocarbon dating and biological tracer studies, in which atomic ions are formed from the sample by charge-stripping in a very high-voltage source, typically coupled to a Van de Graff accelerator.
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(8) The advent of accelerator mass spectrometry, as discussed in Sec.
To calibrate the [[blank].sup.14]C/[[blank].sup.13]C readings from tandem accelerator mass spectrometry (TAMS), we used samples from all of our Pectocarya accessions with known age (21 samples, 1988-1995) supplemented for the earlier years with seeds of Plantago (7 samples, 1983-1988).
Next, the graphite took a trip to a Swiss research facility where scientists analyzed it by accelerator mass spectrometry, which precisely compared the relative amounts of radioactive and stable carbon isotopes.
Using LLNL's Center for Accelerator Mass Spectrometry, Buchholz measured the amount of carbon 14 in DNA in beta cells and discovered that after age 30, the body does not create any new beta cells, thus decreasing the capacity to produce insulin as a person ages.
An AMS (Accelerator Mass Spectrometry) date on the ash deposit obtained from the Beta Analytic Inc., Miami, Florida place the site within Circa Cal.
Using the Lab's Center for Accelerator Mass Spectrometry, they carbon dated the deposits in the sediment and reconstructed fire occurrences from 15,000 B.C.
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