Author: Shanks, R.P.
Paper Title Page
Positive Ion Mass Spectrometry: A Novel Technique of Accelerator Mass Spectrometry Using ECRIS  
  • P. Salou, G. Gaubert
    PANTECHNIK, Bayeux, France
  • S. Freeman, C. McIntyre, R.P. Shanks
    Scottish Universities Environmental Research Centre, East Kilbride, United Kingdom
  • T. Hauser, K. Kearney, M. Sundquist
    National Electrostatics Corp., Madison, Wisconsin, USA
  Accelerator mass spectrometry (AMS) for radio-isotope quantification, like radiocarbon dating, commonly uses negative ion sources (cesium sputter ion sources and cesium gas ion source) to eliminate nitrogen interference. This implies a low yield of ion production, maintenance and refill of cesium, beam intensity instabilities and a long preparation of sample in the case of solid target. A new technique of mass spectrometry, the so called PIMS for Positive-ion Mass Spectrometry, using electron cyclotron resonance ion source (ECRIS) producing positive ions coupled with a charge exchange gas cell, was developed. A PIMS prototype was built and tested. First tests showed comparable but easier results compared to the current AMS machine, within a smaller footprint (a few squared meters), lower potential (100 kvolts) and with the reliability of an ECRIS like stability of the beam, low maintenance, etc. Improvements of the ECRIS were done in order to fulfil the AMS requirements, for example by reducing the recovery time between two samples.  
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