“…However, about half the operational beam time in recent years was used for accelerator mass spectrometry (AMS). The Tsukuba AMS system on the 12UD Pelletron tandem accelerator was developed in 1993 [3], and principally used for 26 Al and 36 Cl AMS. We measured more than 500 samples per year, particularly 36 Cl AMS for earth and environmental science (e.g., ice cores, meteorites, and environmental, hydrological, and geological samples) and also nuclear assessment research (radioisotope tracer, radiation safety, etc.)…”