@article{oai:nagoya.repo.nii.ac.jp:00016110, author = {南, 雅代 and 小田, 寛貴 and 池田, 晃子 and 宮田, 佳樹 and 太田, 友子 and 西田, 真砂美 and 池盛, 文数 and 城森, 由佳 and 近藤, 宏樹 and 吉光, 貴裕 and 坂田, 健 and 加藤, ともみ and 長谷, 和磨 and Nakamura, Toshio and Minami, Masayo and Oda, Hirotaka and Ikeda, Akiko and Miyata, Yoshiki and Ohta, Tomoko and Nishida, Masami and Ikemori, Kazufumi and Jyomori, Yuka and Kondo, Hiroki and Yoshimitsu, Takahiro and Sakata, Ken and Kato, Tomomi and Hase, Kazumaro}, journal = {名古屋大学加速器質量分析計業績報告書}, month = {Mar}, note = {An AMS system (Model 4130-AMS) dedicated to 14C measurements, built by High Voltage Engineering Europe (HVEE), B.V., The Netherlands, was delivered to Nagoya University in 1996/97. Acceptance tests of its performance on carbon isotope measurements were completed January of 1999, and routine measurements began in mid-2000. Since completion of the acceptance tests early 1999, we have encountered a lot of troubles with the machine, particularly in 2002. Since the end of 2002, the machine has worked relatively well, expect for minor problems. The standard deviation (one sigma) of the 14C/12C ratio is around ±O.3% to ±O,4% (a bit larger than the uncertainty of about ±O.3% calculated from 14C counting statistics) and that of the corresponding 13C/12C ratio is ±O.03% to ±O.07%, as are tested for HOxII targets. The number of targets measured was 330, 1430, 2077, 1003, 1,979, 1679, 1772, 1115, 1339, 866, 1300, 1701, 1449 in each year from 1999 to 2011, respectively, and total number of targets measured by the end of 2011 is 18,040. The Tandetron AMS system worked well in the early half of 2011, with only minor failures. In August, mistakes of target exchange during the batch measurement runs became frequent. In every mistake, we have to shut down the ion source to open the target chamber to check the source of the problems. After changing interface cards of the ion source control, mistakes became fewer. However, in December, the mistakes of target exchange during the batch measurement runs became quite frequent. In the end, the hand at the end of the rod to grasp the targets in the ion source was broken. We have replaced it to a new one. We also replaced interface cards of the ion source control completely to overcome the problems successfully. Another problem was to cool down the power supply of the high energy analyzing magnets. We should have to frequently clean the water pipe for cooling. About high voltage sparks, we have regularly removed water vapor from SF6 insulation gas. It seems successful, because we had no sparks in 2011. The last spark occurred on February 22nd in 2010. Owing to these difficulties of the machine, the total number of graphite targets measured was 1449, smaller in number than that in 2010 (1701)., 名古屋大学年代測定総合研究センターシンポジウム報告}, pages = {18--26}, title = {名古屋大学タンデトロンAMS14Cシステムの現状と利用(2011)}, volume = {23}, year = {2012} }