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Estimation of the amount of anthropogenic uranium in 112 Japanese agricultural soils due to application of phosphatic fertilizers
https://repo.qst.go.jp/records/68878
https://repo.qst.go.jp/records/68878250ce4f5-147e-413a-aab4-56de16259351
| 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 | Estimation of the amount of anthropogenic uranium in 112 Japanese agricultural soils due to application of phosphatic fertilizers | |||||
| 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 |
Uchida, Shigeo
× Uchida, Shigeo× Tagami, Keiko× 内田 滋夫× 田上 恵子 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We determined concentrations of total Th and U in 112 Japanese agricultural soil samples (50 paddy field and 62 upland field soil samples) were determined by ICP-MS after microwave digestion. The average concentrations of total Th and U in the paddy field soil samples were 5.7 mg kg-1 and 2.8 mg kg-1, respectively, while those in the upland field soil samples were 2.6 mg kg-1 and 5.5 mg kg-1, respectively. These Th and U concentrations showed no differences between paddy field and upland field soil samples. Concentration ratios of U/Th in paddy field and upland field soils were 0.53 and 0.52 on average, respectively, which were much higher than those in Japanese non-agricultural fields (0.23). The results implied that phosphatic fertilizers, which have high U concentrations, increased the total U concentration in the agricultural fields. Thus, using the natural U/Th ratio in non-agricultural areas, we estimated the excess amount of U. About 52% of total U in paddy field soils (ca. 1.5 mg kg-1 of U on average) and 50% of total U in upland field soils (ca. 1.3 mg kg-1 of U on average) were calculated as excess amounts of U. Thus using of phosphatic fertilizers in agricultural fields makes only a small contribution as external radiation to the general population. This work has been partially supported by the Agency for Natural Resources and Energy, the Ministry of Economy, Trade and Industry (METI), Japan. |
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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 | 5th International Symposium on Naturally Occurring Radioactive Material (第5回自然起源の放射性物質に関する国際シンポジウム) | |||||
| 発表年月日 | ||||||
| 日付 | 2007-03-22 | |||||
| 日付タイプ | Issued | |||||
