Speaker
Description
In the Tono Geoscience Center, Japan Atomic Energy Agency (JAEA), the investigation of deep underground environments for R&D programs related to the geological disposal of High-Level Radioactive Waste (HLW) has been performed by using various dating systems, including Accelerator Mass Spectroscopy. The JAEA-AMS-TONO facility owns three accelerator mass spectrometers (AMS). Two of these are for measuring actual samples, and one is a test device for the development of an ultra-compact AMS for measuring carbon-14. These AMSs are used to carry out scientific research into deep geological formations carried out by the organization, as well as to measure the age of requested samples under the facility utilization system.
The two AMSs for measuring actual samples that can be used for dating are JAEA-AMS-TONO-5MV (15SDH-2 manufactured by NEC, maximum acceleration voltage 5.0 MV) and JAEA-AMS-TONO-300kV (4103Bo-2 manufactured by HVEE, maximum acceleration voltage 300 kV), and both can measure four nuclides; carbon-14 ($^{14}$C), beryllium-10, aluminum-26, and iodine-129. Additionally, using the JAEA-AMS-TONO-5MV, we are developing technology for measuring chlorine-36 ($^{36}$Cl), which is useful for dating underground water, and investigating methods for removing sulfur using cells. The ultra-compact AMS for $^{14}$C measurement is a device that uses ion channeling to separate molecules of the same mass and is currently undergoing demonstration tests with the aim of becoming a general-purpose $^{14}$C measurement device.
Furthermore, sample preparation techniques have been improved for $^{36}$Cl and small-mass $^{14}$C measurements by the AMSs. In our study, the small-mass graphitization was performed by a third-generation automated graphitization equipment (AGE3, IonPlus AG).
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