MALT (Micro Analysis Laboratory, Tandem accelerator, The University of Tokyo) is a service and research facility for elemental and isotopic micro analysis using a tandem accelerator. At MALT, highly refined AMS, NRA and PIXE systems have been developed. The accelerator is 5UD Pelletron tandem Van de Graaff (produced by NEC, USA) and maximum 5MV voltage is available. 5MV is a good balancing voltage for AMS. While it is easier to keep stable than higher voltage, 5MV is enough to enable multi-nuclides AMS not only 14C with excellent precision and sensitivity. At MALT, high quality AMS of 7Be, 10Be, 14C, 26Al have been available. Recently 36Cl-AMS system using a gas-filled magnet was also greatly refined and new 129I-AMS system was developed and shows good performance. While MALT has offered services for the facility utilization for the university scholars, also has explored new scientific field using AMS by the collaboration with scholars of various field. It includes the development of not only the AMS system but also the chemistry laboratory for the pre-treatment. One of recently developed chemistry apparatus is the large size super-sonic bath for the purification of quartz, which is essential for the effective pre-treatment of in situ 10Be and 26Al measurements. Now in situ TCN dating method is applied to geomorphological studies with various fields mainly in Japan and Korea. We also developed iodine extraction and purification system. 129I concentrations of soils sampled from several areas in Japan are being measured for the study of the environmental influence of nuclear reprocessing. Some large projects are also going on or starting. Systematic radiocarbon dating of Japanese earthenware of "Jomon" era and "Yayoi" era is carried out for the construction of precise Japanese history by the collaboration with the National Museum of Japanese History. Detailed analysis of cosmogenic nuclides (10Be, 26Al and 36Cl) in the ice core to be obtained at Dome-F in the Antarctica will be a large project of coming years. This requires highly sensitive and effective AMS system especially for 26Al and 36Cl. Now preliminary studies for both sample treatment and AMS system are now undergoing. Including other scientific themes, over 40 projects are running at MALT every year. The total accelerator operation time in the 2004 season was 6,250 hours. On the November of 2004, the total operation time of the Pellet chain since the construction of MALT went over 40,000 hours without replacement.
Web Page: www.malt.rcnst.u-tokyo.ac.jp
See more of Poster Session I
See more of The 10th International Conference on Accelerator Mass Spectrometry (September 5-10, 2005)