Multi-nuclide AMS with a middle-sized tandem accelerator of MALT

With a middle-sized tandem accelerator of the multipurpose facility of the University of Tokyo we have developed an AMS system to perform multi-nuclid e AMS. Starting with Be-10- and Al-26-AMS development,C-14-AMS has been als o developed modifying the gas stripper, the injection system, the ion sourc e and so on. The newly designed gas ionization chamber lowered the backgrou nd level for the detection of Be-10 and Al-26 by more than one order of mag nitude. C-14-AMS is now precise enough for practical use, though the repeat ability is not better than +/-0.7%. However, more time is still necessary u ntil our C-14-AMS will run stable with good precision of better than +/-0.5 %. A gas filled magnet (GFM) and a TOF system have been developed successfu lly for the detection of Cl-36 and I-129, respectively. Researches on Ni-59 -AMS system by using the inverse PIXE technique are now underway and Ca-41 will be the next target for MALT-AMS. (C) 2000 Elsevier Science B.V. All ri ghts reserved.