Current status of JAEA-AMS-TONO in the 20th year

Abstract JAEA-AMS-TONO has been in operation at the Tono Geoscience Center, Japan Atomic Energy Agency since 1998 and 20 years have passed from the beginning of its utilization. The AMS has been used to measure 14 C, 10 Be and 26 Al. The main use is measurement of 14 C in geological samples for dating studies in neotectonics and hydrogeology, in support of the research on geosphere stability applicable to the long-term isolation of high-level radioactive waste. In order to increase the speed of sample preparation, we introduced an automated graphitization equipment and made a gas-strip line to collect dissolved inorganic carbon in groundwater samples. Measurement of 10 Be and 26 Al has been used for geoscience studies and the detection limit in the measurement of 10 Be was improved. Recently optimization of AMS settings for 129 I-AMS has been progressed.