R&D of ultra high sensitive ^<26>Al direct detection system with an electrostatic tandem accelerator

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A ^<26>Al ultra high-sensitive accelerator mass spectrometry system, ^<26>Al-AMS, has been developed successfully on a 12UD tandem accelerator at the University of Tsukuba. A newly developed ^<26>MgO-molecular pilot beam and ^<26>Al^<13+> full stripped detection method allowed us to realize the AMS system without any modifications in the accelerator. The performances of the ^<26>Al-AMS are listed up on the followings.1)Method ^<26>AlO^-beam and ^<26>MgO^-molecular pilot beam method2)Sample Form Al_2O_33)Pilot Material ^<26>MgO_24)^<27>AlO^-ion current 〜1.5μA5)^<26>MgO^-ion current 〜5nA6)Acceleration Voltage 10MV7)Pilot Particle ^<26>Mg^<7+>8)Sensitivity <2×10-15(^<26>Al/^<27>Al)9)Accuracy 〜3%The ultra high sensitivity is achieved fortunately, but the accuracy is not sufficient and the improvement of it is strongly requested. Though the total performance of the system is not perfect at this moment, The ^<26>Al^-AMS services are commenced for the users who are planning the ^<26>Al measurements.