Gross .BETA. Activity Survey in Fukuoka Prefecture(Fiscal Years 1965-1994).
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- NARAZAKI Yukinori
- Fukuoka Institute of Health and Environmental Sciences
Bibliographic Information
- Other Title
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- 福岡県における全ベータ放射能調査(1965年度~1994年度)
- フクオカケン ニ オケル ゼン ベータ ホウシャノウ チョウサ 1965ネンド
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Abstract
Based on the results from an analysis of the fallout collected in Fukuoka Prefecture in fiscal years 1965-1994, further analysis was carried out to determine the relation between gross β activity and some radionuclides, such as 40K, 90Sr, 137Cs and so on, which are regarded as key nuclides in assessing radiological impact on human health. Gross β activity in fiscal years 1964-1984 decreased in accordance with a regression curve given by F(x)=2.58×106e-0.126x, where r=0.655. The gross β activity during the period of fiscal years 1965-1981, when the influence of atmospheric nuclear explosion tests prevailed, was found to be in the range of 3.70-61, 700MBq/km2, among which 64% of the data was lower than 200MBq/km2. The mean contributions of 90Sr and 137Cs to gross β activity were estimated to be only 1.9% and 3.4%, respectively. No significant correlation was found between the radioactivities of these two nuclides and gross β activity.<br>After 1982, gross β activity decreased to a level ranging from ND to 666MBq/km2, in which 50% of the data was evaluated to be ND. In recent years, natural 40K is found to be the major contribution to gross β activity.
Journal
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- Japanese Journal of Health Physics
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Japanese Journal of Health Physics 32 (2), 193-197, 1997
Japan Health Physics Society
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Details 詳細情報について
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- CRID
- 1390001204289391104
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- NII Article ID
- 10002136515
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- NII Book ID
- AN00228458
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- ISSN
- 18847560
- 03676110
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- NDL BIB ID
- 4248000
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed