| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-12-17 |
| タイトル |
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|
タイトル |
Monte Carlo simulation to optimize measurement geometry of continuous air monitor with Si semiconductor detector |
|
言語 |
en |
| 言語 |
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|
言語 |
eng |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Continuous air monitor |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Monte Carlo simulation |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Measurement geometry |
| キーワード |
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|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Alpha spectrometry |
| キーワード |
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|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Discriminative measurement |
| 資源タイプ |
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|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Tamakuma, Yuki
Hashimoto, Hiroki
Taoka, Manaya
Yamada, Ryohei
Iwaoka, Kazuki
Omori, Yasutaka
Hosoda, Masahiro
Tokonami, Shinji
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
One of the challenges in real-time monitoring of airborne alpha-emitting radionuclides using Continuous Air Monitors (CAMs) is to discriminate alpha particles emitted by artificial radionuclides from those emitted by natural radionuclides, as the alpha energy spectrum is easily degraded due to its high stopping power. Although the measurement geometry significantly affects the alpha energy spectrum, there are no reports that have investigated the optimized geometry. This study conducted a Monte Carlo simulation to optimize the measurement geometry of the CAMs. The CAM was modelled using a radiation transport simulation code, and the counting efficiencies for 218Po and 239Pu and the overlapping ratio were simulated. The Minimum Detectable Concentration (MDC) of 239Pu was then estimated as an indicator to optimize the geometry. Although a constant counting efficiency is generally used for the same geometry regardless of the alpha energy, the counting efficiency differed up to ∼0.04 by the alpha energy depending on the measurement geometry. The overlapping ratio for a 50-mm diameter detector ranged from 0.22 to 0.35, while those for a 25-mm diameter detector was below 0.25. This discrepancy is because of the incident angle distribution biased towards large angles. The lowest MDC was estimated to be ∼3 Bq m−3 at 20 L min−1 under 25 Bq m−3 of 218Po. The MDC was low for small filter diameters and Filter-to-Detector Distances (FDDs) under most of the simulated conditions. The results indicate that a shorter filter diameter and FDD would be preferable for alpha spectrometry under normal air pressure. |
|
言語 |
en |
| 書誌情報 |
en : Radiation Physics and Chemistry
巻 241,
p. art. no. 113507,
発行日 2025-12-03
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| 出版者 |
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出版者 |
Elsevier Ltd |
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言語 |
en |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0969806X |
| DOI |
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関連タイプ |
isIdenticalTo |
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|
識別子タイプ |
DOI |
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|
関連識別子 |
https://doi.org/10.1016/j.radphyschem.2025.113507 |
| 権利 |
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|
権利情報 |
© 2025 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
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言語 |
en |
| 著者版フラグ |
|
|
出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 引用 |
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内容記述タイプ |
Other |
|
内容記述 |
Radiation Physics and Chemistry, 241, art. no. 113507; 2025 |
|
言語 |
en |
RPC241_113507.pdf (5.5 MB)
