Evaluation of environmental pollution with measurement of radioactivity and heavy metals in tree rings
| Project/Area Number |
10680513
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
環境影響評価(含放射線生物学)
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
AOKI Toru Kyoto University, Radioisotope Research Center, Research Associate, 放射性同位元素総合センター, 助手 (70027051)
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| Co-Investigator(Kenkyū-buntansha) |
KATAYAMA Yukio Kyoto University, Graduate School of Agriculture, Associate Professor, 農学研究科, 助教授 (30026512)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | tree / ring / radioactivity / heavy metal / environmental pollution |
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| Research Abstract |
In order to clarify environmental pollution by the radioactive substance which had been caused in the past, the radioactivity in the tree annual rings were measured. The concentration profiles of ^<90>Sr and ^<137>Cs in the stems of sugi from Nagasaki and Hiroshima, which grew in the black rain fall area caused by atomic bomb were determined. By analyzing the ^<90>Sr/Sr ratio profile obtained from the sugi from Nagasaki and with appropriate corrections, the fallout of the Nagasaki atomic bomb on the local soil environment could be distinguished from a broad spectrum of the atomic nuclear weapons tests.
The concentration profiles of 22 elements along radial direction in the stem of healthy trees and growth defect trees for sakura and ume were also determined by neutron activation analysis and/or the ICP-MS method. The concentration of elements was not so high as the growth of the tree was inhibited. The small peaks in distribution profiles of elements such as manganese, nickel, and zinc in several trees, were detected at the rings formed around 1987.
This suggests the possibility to record the transition of environmental pollution with heavy metals in the annual ring.
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Report
(4 results)
Research Products
(13 results)
