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Isotope dilution SF-ICP-MS for precise determination of Pu isotopes in a seawater reference material
https://repo.qst.go.jp/records/68881
https://repo.qst.go.jp/records/68881be8f78a7-f4eb-44bc-8169-8c4636d21442
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-03-26 | |||||
| タイトル | ||||||
| タイトル | Isotope dilution SF-ICP-MS for precise determination of Pu isotopes in a seawater reference material | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Zheng, Jian
× Zheng, Jian× Yamada, Masatoshi× 鄭 建× 山田 正俊 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In order to obtain precise Pu isotope composition of Irish Sea water reference material issued by the International Atomic Energy Agency (IAEA-381), we analyzed the activities of 239Pu, 240Pu, 239+240Pu and the atom ratio of 240Pu/239Pu by a highly sensitive isotope dilution SF-ICP-MS method combined with two-stage chromatographic separation and purification. With a mean chemical yield of 65 % for 242Pu tracer, the experimentally established values for 239Pu, 240Pu and 239+240Pu activities are in good agreement with the certified ones. For the 240Pu/239Pu atom ratio, we obtain a value of 0.2315  0.0008 with a high precision (RSD, 0.35 %), which is much more precise and reliable than the information value of 0.22  0.03 (RSD, 13.6 %) provided by the IAEA certification report. Due to the low concentration of Pu isotopes in the marine environment, the determination of 240Pu/239Pu atom ratio, which is extremely important and useful for the source identification, by ICP-MS has to be done at ultra-trace level (tens and/or hundreds of fg Pu). The validation of the analytical method, including the correction of possible mass discrimination effect during the ICP-MS measurement, is essential to obtain reliable results. As the Pu isotope standard with certified Pu isotope ratio is no longer commercially available, the use of certified U isotope standard has commonly been used as an alternative approach for the mass bias correction, however, this correction is complicated. It is expected that our results on the precise determination of 240Pu/239Pu atom ratio can spark additional similar work, so that a consensus value of the 240Pu/239Pu atom ratio with high precision can be reached for the IAEA-381 seawater reference material, thus making it an ideal reference material for not only method validation for seawater samples, but also for more general use as a Pu isotope standard for the mass discrimination correction for other environmental samples when using ICP-MS techniques. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 第8回環境放射能研究会 | |||||
| 発表年月日 | ||||||
| 日付 | 2007-03-24 | |||||
| 日付タイプ | Issued | |||||
