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The AMS Instruments

NOSAMS Continuous-Flow AMS System (CFAMS)

Accelerator mass spectrometry, or AMS, is a method of radiocarbon analysis where atoms of 14C contained in a sample are directly counted. The current NOSAMS accelerator, the CFAMS instrument, was built and commissioned in 2006-2007. It is constructed around a National Electrostatics Corporation 500 kV pelletron accelerator. A bounced injection system with a modified MC-SNICS ion source as well as a microwave gas ion source are drawn on the left, and the high energy mass spectrometer and particle detection system is on the right.

Plan view of the continuous-flow AMS (CFAMS) system.

NOSAMS tandetron AMS system

The first NOSAMS accelerator was purchased in 1989 and commissioned in 1992 at the Woods Hole Oceanographic Institution, Woods Hole, Massachusetts.

The system was over 9 meters long and consisted of a 2.5 million volt tandem accelerator, sandwiched between a low-energy mass spectrometer to the left and a high-energy mass spectrometer to the right. It was originally configured with a GIC-860 ion source and a recombinator injector, but was upgraded in 2014 with a National Electrostatics Corporation MC-SNICS ion source and a sequential or "bounced" injection system. The system was decommissioned in late 2021.