Accelerator Mass Spectrometry; Ion Beam Analysis; Tandem accelerator; Long-lived radionuclides; Exposure dating
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M. Christl* C. Vockenhuber L. Wacker P.W. Kubik H.-A. Synal V. Alfimov T. Schulze-König, Performance parameters and standard reference materials at the ETH AMS facilities., in Nuclear Instruments and Methods B
The project deals with the upgrade of the 6 MV EN tandem accelerator of the ETH Laboratory of Ion Beam Physics. Since its installation in the 1960s the accelerator allowed state-of-the-art measurements in Accelerator Mass Spectrometry and Ion Beam Analysis. However, spare parts for the currently used belt charging system are not available any more. The proposed upgrade to a Pelletron charging system guarantees an operation of the tandem accelerator for the future. In addition, the gas stripper at the terminal will be redesigned with improved gas recirculation and larger apertures, the column resistors will be adopted to the new charging current and the insulation gas cooling system will be exchanged. The new charging system should result in improved terminal voltage stability; together with a better ion optical transmission the tandem accelerator will allow more precise measurements, in particular of radionuclides with isobaric interferences (e.g. 32Si, 36Cl), which are inaccessible to the low-energy AMS systems at the laboratory.