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Determination of rain age via γ rays from accreted radon progeny
https://doi.org/10.24517/00029410
https://doi.org/10.24517/000294104e72a6f2-9b46-466e-9139-de6cc9bfce3e
| 名前 / ファイル | ライセンス | アクション |
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PR-KOMURA-K-74921.pdf (447.8 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||
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| 公開日 | 2017-10-05 | |||||||
| タイトル | ||||||||
| タイトル | Determination of rain age via γ rays from accreted radon progeny | |||||||
| 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_6501 | |||||||
| 資源タイプ | journal article | |||||||
| ID登録 | ||||||||
| ID登録 | 10.24517/00029410 | |||||||
| ID登録タイプ | JaLC | |||||||
| 著者 |
Greenfield, Mark B.
× Greenfield, Mark B.× Ito, N.× Iwata, A.× Kubo, K.× Ishigaki, M.× Komura, Kazuhisa |
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| 著者別表示 |
小村, 和久
× 小村, 和久
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| 提供者所属 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 金沢大学自然計測応用研究センター自然計測研究部門 | |||||||
| 書誌情報 |
Journal of Applied Physics 巻 104, 号 7, p. 74912, 発行日 2008-01-01 |
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| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 0021-8979 | |||||||
| NCID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA00693547 | |||||||
| DOI | ||||||||
| 関連タイプ | isIdenticalTo | |||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | 10.1063/1.2990773 | |||||||
| 出版者 | ||||||||
| 出版者 | American Institute of Physics | |||||||
| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | The relative γ ray activities from P 214 b and B 214 i condensed from precipitation are used to determine its "age," the average time the accreted activity has been removed from secular equilibrium. A verifiable assumption that radon progeny on/in the surface/volume of droplets mostly remains in secular equilibrium until they begin their descent, enables estimates of their transit times to ground of typically a few tens of minutes. This agrees well with the time expected for the activity on the surface of droplets to reach the ground from heights of a few kilometers. The half lives of γ activities from B 214 i and P 214 b, 19.7 and 26.9 min, respectively, are on the same scale as transit time to ground and close enough to each other to measure ratios of activities from secular equilibrium (1.00) to transient equilibrium (3.88) within a few hundreds of minutes. The ratio of γ count rates is independent of knowledge of either initial activity or any systematic errors and thus limited only by the uncertainty from counting statistics, which from condensates of 5-30 l of rain viewed with 2π solid angle by a 50% efficient, high-resolution Ge detector is only a few percent. These ratios fit extremely well to known theoretical curves, which cannot only be used to date rain but can also be extrapolated backward to determine radon progeny activities in rain prior to its descent, knowledge of which may facilitate further studies using radon progeny as tracers. © 2008 American Institute of Physics. | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 関連URI | ||||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | http://dx.doi.org/10.1063/1.2990773 | |||||||
