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Estimation of the amount of anthropogenic uranium in 112 Japanese agricultural soil samples due to application of phosphatic fertilizers
https://repo.qst.go.jp/records/54033
https://repo.qst.go.jp/records/54033290f0152-dc33-4b68-9281-115c033068f1
| Item type | 会議発表論文 / Conference Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-08-19 | |||||
| タイトル | ||||||
| タイトル | Estimation of the amount of anthropogenic uranium in 112 Japanese agricultural soil samples 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_5794 | |||||
| 資源タイプ | conference paper | |||||
| 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) 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 5.5 mg kg-1 and 2.6 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. | |||||
| 書誌情報 |
Naturally Occurring Radioactive Material (NORM) (IAEA Proceedings Series) 巻 P1326, 号 6.6, p. 1-6, 発行日 2008-08 |
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