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Current status of 241Am in Nishiyama soils: six decades after Nagasaki A-bomb explosion
https://repo.qst.go.jp/records/69690
https://repo.qst.go.jp/records/6969028bf5e2e-8a36-4c1f-beda-3d5957d77506
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2009-03-05 | |||||
| タイトル | ||||||
| タイトル | Current status of 241Am in Nishiyama soils: six decades after Nagasaki A-bomb explosion | |||||
| 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× Yoshida, Satoshi× Yamada, Masatoshi× Aono, Tatsuo× 鄭 建× 吉田 聡× 山田 正俊× 青野 辰雄 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Americium (241Am, t1/2 = 433 y) is present in the environment as a consequence of nuclear power plant accidents, authorized discharges from reprocessing plants, and atmospheric weapons tests. It is a daughter product of 241Pu (t1/2 = 14.4 y) through beta-decay. Therefore, the concentration of 241Am will continuously increase in the environment. On August 9, 1945, a plutonium atomic bomb was exploded 503 m in the air over Nagasaki City, Japan. High radioactivities due to fission products had been detected in the Nishiyama area (ca. 3 km east of the hypocenter) of Nagasaki City after the explosion. In contrast to the comprehensive studies on Pu in Nishiyama area, a great knowledge gap exists on the concentration variation, the mobility and the soil-plant transfer of 241Am. In the past 60 years, few efforts were made for 241Am study in Nishiyama soil. In this paper, we investigated the current status of 241Am and Pu isotope concentrations in surface soils of Nagasaki using isotope dilution sector-field ICP-MS combined with extraction chromatography. We reconstructed the variation of 241Am and 241Pu in the past 6 decades. We found that 241Am has reached its expected maximum activity in 2008, and 241Am/239+240Pu activity ratio, similar to 240Pu/239Pu atom ratio, was a useful fingerprint for the source identification of Pu contamination in the environment. | |||||
| 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10回 「環境放射能」研究会 | |||||
| 発表年月日 | ||||||
| 日付 | 2009-03-05 | |||||
| 日付タイプ | Issued | |||||
