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

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 ¹⁴C, ¹⁰Be and ²⁶Al. The main use is measurement of ¹⁴C 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 ¹⁰Be and ²⁶Al has been used for geoscience studies and the detection limit in the measurement of ¹⁰Be was improved. Recently optimization of AMS settings for ¹²⁹I-AMS has been progressed.