The advent of the latest generation of radiocarbon AMS spectrometers has opened new possibilities for the design of biomedical AMS instruments. We will present a new design of such a dedicated AMS system. It will be a simplified version of our MICADAS device, which has successfully demonstrated its radiocarbon dating capabilities. The new biomedical system will operate in a DC mode and only mass 14 ions will be injected into the acceleration unit, which will be a vacuum insulated differentially pump high voltage platform hosting the stripper assembly. High voltage is provided from commercial 200 kV power supply. At the high-energy end, ion separation will be performed by a non-energy dispersive combination of a 90° magnet and a 90° spherical electrostatic deflector. Finally, particles will be identified in gas ionization detector. To normalize the 14C ions detected we will use a current measurement of the 12C- ion beam extracted from the source. To monitor intensity molecules, 13C ions, fragments from injected 13CH molecules will be measured in a Faraday after the HE magnet. This concept makes possible a very small overall size for the instrument (2.6 x 2.3 m2). The ion source will be adopted to the requirements of biomedical AMS. In particular, it will be equipped with a high throughput sample changer. This device will have to magazine load locks which make a continuous source operation possible.
See more of AMS in Low Dose Bioscience Workshop
See more of The 10th International Conference on Accelerator Mass Spectrometry (September 5-10, 2005)