Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8040350 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2015 | 4 Pages |
Abstract
Accelerator mass spectrometry (AMS) is one of method used for 90Sr determination. It would enable rapid 90Sr measurements from environmental samples such as water, soil, and milk. However, routine analysis of 90Sr using AMS has not yet been achieved because of difficulties associated with isobaric separation and production of intense negative ion beams characterized by currents from hundreds of nanoamperes to several microamperes. We have developed a rapid procedure for preparing samples with optimum compositions for use with AMS, which enables production of intense Sr beam currents from an ion source. Samples of SrF2 were prepared from a standard Sr solution and agricultural soil. The time required to prepare a SrF2 sample from a soil sample was 10Â h. Negative 88SrF3â ions were successfully extracted at 500Â nA from mixed samples of SrF2 and PbF2. In the present work, negative ions of 90Zr, included as an impurity, were accelerated with a tandem accelerator operated at a terminal voltage of 5Â MV. Ions characterized by a charge state of 6+ were channeled into a gas counter. An atomic ratio of 90Zr/88Sr of 3Â ÃÂ 10â8 was estimated for the soil sample. No signal was detected from the assay of PbF2, which was pressed in an aluminum cathode, for a mass number of 90. PbF2 revealed good performance in the production of negative SrF3â molecular ion beams and detection of 90Sr with a gas counter.
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Authors
Yukihiko Satou, Keisuke Sueki, Kimikazu Sasa, Tetsuya Matsunaka, Tsutomu Takahashi, Nao Shibayama, Daiki Izumi, Norikazu Kinoshita, Hiroyuki Matsuzaki,