An improved method for 129I-AMS measurement

作者：Zhou Ben Hu^*; Yasuo Nagashima; Jiang Shan; Wu Wei Ming; Guan Yong Jing; Wu Shao Yong; He Ming; Yuan Jian; Ruan Xiang Dong; Riki Seki; Kimikazu Sasa; Tsutomu Takahashi; Yuki Tosaki; Yukii Matsushi; Michikoo Tamari; Keisuke Sueki

来源：Nuclear Electronics & Detection Technology, 2007, 27(4): 740-744.

An improved 129I-AMS measurement method has been developed on the 12UD tandem accelerator at the University of Tsukuba. These improvements include making a deflector and installing it behind the 120° magnet to mend the measurement of 127I current and 129I count. With MoQz molecular pilot beam to stabilize accelerator terminal voltage, the terminal voltage is kept stably within 0.1% accuracy. Combining with second stripper, this method is proved to be effective. The level of background is 7.83 10-13 for AgI reagent sample. The uncertainty of the measurement is under 7% for a series of samples which 129I/127I ratio are between 4.92 × 10-10 and 0.28 × 10-10.

• 出版日期2007