Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1683581 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2010 | 4 Pages |
Abstract
Efficient boron suppression for precise 10Be measurements with AMS is crucial. The performance of ΔE − Eres gas ionization chambers is also very important for isobar suppression at low beam energies (<1 MeV). A boron suppression of 6–7 orders of magnitude is achievable with the ETH ΔE − Eres gas ionization in the standard operational mode (readout of ΔE and Eres electrodes). Some physical effects such as pulse height defect or the energy focusing effect within a ΔE section will be discussed, emphasizing 10Be measurements below 1 MeV. Additionally the potential of silicon nitride membranes as passive energy degraders in front of the detector is demonstrated.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
A.M. Müller, M. Christl, M. Döbeli, P.W. Kubik, M. Suter, H.-A. Synal,