Evaluation of environmental pollution with measurement of radioactivity and heavy metals in tree rings

通过测量树木年轮中的放射性和重金属来评估环境污染

• 批准号: 10680513
• 负责人: AOKI Toru
• 金额: $ 1.92万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680513/
• 关键词: tree; ring; radioactivity; heavy metal; environmental pollution

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.

为了弄清过去放射性物质对环境造成的污染，测定了树木年轮中的放射性。测定<90><137>了生长在原子弹爆炸黑雨区的长崎和广岛杉茎中的^ Sr和^ Cs浓度剖面。通过分析<90>从长崎杉中获得的^ Sr/Sr比值剖面并进行适当的校正，长崎原子弹爆炸对当地土壤环境的影响可以从核武器试验的广泛范围中区分出来。还用中子活化分析和/或ICP-MS法。元素浓度不高，抑制了树的生长。在1987年前后形成的年轮中，锰、镍、锌等元素在几种树木中的分布曲线上出现了小峰，这表明年轮中记录重金属环境污染过渡的可能性。

项目成果

Y.Katayama, et al.: "Naturally occurrence of Sr and Ca in the Stem of a Japanese Cedar (Cryptomeria japonica D. Don) Using PIXE"Annual Report of Quantum Science and Engineering Center. 150-151 (2000)

Y.Katayama 等人：“使用 PIXE 在日本雪松 (Cryptomeria japonica D. Don) 的茎中自然出现 Sr 和 Ca”量子科学与工程中心年度报告。

青木達 他: "環境放射能モニターとしての樹木年輪の有効性"Proceeding of the First Workshop on Environmental Radioactivity. 61-64 (2000)

Tatsu Aoki 等人：“树木年轮作为环境放射性监测器的有效性”第一届环境放射性研讨会论文集 61-64 (2000)。

Toru Aoki: "MEASUREMENT OF TRACE ELEMENTS IN TREE RINGS USING THE PIXE METHOD"Nuclear Instruments and Methods B. 136-138. 919-922 (1998)

Toru Aoki：“使用 PIXE 方法测量树木年轮中的痕量元素”核仪器和方法 B.136-138。

S.Ko, T.Aoki, Y.Katayama, J.Takada: "Losses of elements in plant samples under the dry ashing process"Journal of Radioanalytical and Nuclear Chemistry. 239. 591-594 (1999)

S.Ko、T.Aoki、Y.Katayama、J.Takada：“干灰化过程中植物样品中元素的损失”放射分析与核化学杂志。

Toru Aoki: "Measurement of injected strontium in the stem of a Japanese ceder(Cryptomeria japonica D.Don) using PIXE"International Journal of PIXE. 8. 139-145 (1998)

Toru Aoki：“使用 PIXE 测量日本桧木（Cryptomeria japonica D.Don）茎中注入的锶”国际 PIXE 杂志。