| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-05-07 |
| タイトル |
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タイトル |
INFLUENCE OF SHORT-LIVED RADIOIODINES OTHER THAN 131I ON SCREENING DIRECT THYROID MEASUREMENTS WITH TCS-172 NAI(TL) SURVEY METERS |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 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 |
Tani Kotaro
Kim Eunjoo
Yajima Kazuaki
Naito Masayuki
Ishigure Nobuhito
Tiffany Beaumont
David Broggio
Kurihara Osamu
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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 |
In a nuclear emergency, one of the actions taken for the public is to monitor thyroid exposure to radioiodines. Japan’s Nuclear Regulation Authority recently published a report on such monitoring and proposed direct thyroid measurements with conventional NaI(Tl) survey meters (e.g., Hitachi model TCS-172) as a primary screening method. A previous study proposed screening levels (SLs) used in these simplified measurements as net reading values of the TCS-172 device. Age-specific SLs were derived from a thyroid equivalent dose of 100 mSv due to the inhalation intake of 131I. The present study addressed the possible influence of short-lived iodine isotopes other than 131I on the simplified measurements. In preparation for such measurements, the responses of the device for 132I as an ingrowth component from 132Te, 133I, 134I and 135I in the thyroid were evaluated by numerical simulations using age-specific stylized phantoms in addition to those for 131I obtained in the previous study. The radioactivity ratios of the relevant isotopes were taken from the inventory data of the Fukushima Daiichi Nuclear Power Plant. The results were used to predict the net readings of the device when 132Te-132I and 133I as well as 131I were inhaled at 24 or 72 hours after the shutdown of a nuclear power plant. In these cases, the signals from 132Te-132I and 133I become undetectable a couple of days after intake, which could lead to underestimations of the thyroid dose. To estimate thyroid dose accurately from the simplified measurements, it is necessary to identify the exact time of intake after the shutdown and the actual physiochemical property of 132Te that affects the thyroid uptake of 132I. |
| 書誌情報 |
Radiation Protection Dosimetry
巻 200,
号 3,
p. 315-321,
発行日 2023-12
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| 出版者 |
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出版者 |
Oxford University Press |
| 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 |
0144-8420 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1093/rpd/ncad304 |
