Abstract
The use of helium as stripper gas improved the measurement efficiency of compact AMS systems for many radionuclides significantly because of a higher mean charge state and reduced scattering losses compared with other conventional gases. Recent tests at the ETH 500kV AMS facility (Tandy) with aluminum have demonstrated that a transmission of more than 50% is achievable in the charge state 2+ at terminal voltages between 300 and 500kV. On the other hand the m/q interference of 13C1+ entering the detector at very high intensity has to be suppressed. Based on first positive results with a very simple absorber cell a more elaborate absorber detector configuration was designed and built in order to eliminate the carbon interference. The suppression of carbon with the new detector–absorber design has been studied extensively at 300kV (950keV) and 500kV (1550keV) and the results are compared with simulated data. With the new configuration an overall transmission for 26Al of more than 42% at 500kV and about 30% at 300kV terminal voltage is achieved, while 26Al/27Al blank ratios of aluminum targets in the range of 5–14·10−15 are measured.
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