Studies on plutonium in terrigenous air-dust

陆源气尘中钚的研究

• 批准号: 09640581
• 负责人: NAKANISHI Takashi
• 金额: $ 2.18万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640581/
• 关键词: air-dust; terrigenous air-dust; Pu-239, 240; Fe; Po-210; Pb-210; ocean flux; 土壌粒子塵; Am-241; Pb-210放射能比; Pu-239

For a study to estimate terrigenous air-dust fluxes to oceanic region by using environmental plutonium as a tracer, Pu-239, 240 and Fe were determined in air-dust samples collected in Kanazawa, Japan through the years from 1993 to 1998. The air-dust samples were collected using a five-stages (particle size : <1.1 μm, 1.1〜2.0 μm, 2.0〜3.3 μm, 3.3〜7.0 μm, 7.0 μm<) Andersen-type high-volume air sampler, and catcher plates and backup filter were replaced monthly ; air-dust collected every 1-8 months was analyzed as one batch.Throughout the above mentioned sampling years and particle sizes, the concentrations of Pu-239, 240 and Fe I n the air-dust samples were in a range from 0.1 to 10 μBq-Pu/mg-dust and from 2 to 30 μg-Fe/mg-dust. The Pu/Fe concentration ratios tend to be high in finer air-dust, suggesting that Pu is adsorbed on the surface of terrigenous air-dust. Through the analyses of Po-210/Pb-210 activity ratios in air-dust samples collected occasionally for a few days using Andersen-type low-volume air sampler, from 9 to 140 days were estimated as the apparent floating time of air-dust (particle size : O.06〜0.13 μm, O.13〜0.22 μm, O.22〜0.33 μm, 0.33〜0.52 μm, 0.52〜0.76 μm, 0.76〜1.3 μm, 1.3〜2.5 μm, 2.5〜3.9 μm, 3.9〜5.7 μm, 5.7〜8.5 μm, 8.5〜12.1 μm).

对于一项研究，通过使用环境p用作示踪剂来估算海洋区域的陆源空气粉末，PU-239、240和Fe在1993年至1998年在日本卡纳泽（Kanazawa）收集的空气粉末样品中确定。每月更换7.0μm，7.0μm<）Andersen型高容量空气采样器，捕捉器板和备用滤清器每月更换；每1-8个月收集一次的空气被分析为一批。以上提到的采样年和粒径，PU-239、240和Fe i n的浓度在0.1至10μbq-pu/mg dust范围内，从2到30μg-fe/mg/mg/mg/mg/mg/mg/mg。 PU/FE浓度率在更细的空气中往往很高，这表明PU是通过使用Andersen型的低量空气采样器的空气粉尘样品中PO-210/PB-210活性比的分析，从9到140天收集了几天，这是估计的9至140天的粒子尺寸（粒子大小：粒子大小：粒子大小： O.06-0.13-0.22-0.22-0.33-0.52-0.76-1.3μm，1.3-2.5μm，2.5-3.9μm，3.9-5.7μm，5.7-8.5μm，5.7-8.5μm，8.5-12.1μm）。

项目成果

M. A. Haque, T. Nakanishi: "Host phase of ィイD1239,240ィエD1Pu and ィイD1241ィエD1Am in deep-sea sediment"J. Radioanal. Nucl. Chem.. 239(3). 565-569 (1999)

M. A. Haque，T. Nakanishi：“深海沉积物中 D1239、240D1Pu 和 D1241D1Am 的宿主相”J. Radioanal Chem. 239(3) (1999)。

M.A.Haque,T.Nakanishi: "Chemical dissolution of total content of fallout plutonium in deep-sea sediment"J.Radional.Nucl.Chem.. 241(3). 575-579 (1999)

M.A.Haque，T.Nakanishi：“深海沉积物中沉降钚总含量的化学溶解”J.Radional.Nucl.Chem.. 241(3)。

Y. Miyamoto: "Interferences in neutron and photon activation analysis"J. Radioanal. Nucl. Chem.. 239(1). 165-175 (1999)

Y. Miyamoto：“中子和光子激活分析中的干扰”J。

Y.Nozaki,M.Yamada,T.Nakanishi,Y.Nagaya,K.Nakamura,K.Shitashima,H.Tsubota: "The distribution of radionuclides and some trace metals in the water columns of the Japan and Bonin trenches" Occanologica Acta. 印刷中.

Y. Nozaki、M. Yamada、T. Nakanishi、Y. Nagaya、K. Nakamura、K. Shitashima、H. Tsubota：“日本和小笠原海沟水柱中放射性核素和一些痕量金属的分布”《海洋学学报》正在打印。

Y.Nozaki, M.Yamada, T.Nakanishi, Y.Nagaya, K.Nakamura, K.Shitashima, H.Tsubota: "The distribution of radionuclides and some trace metals in the water columns of the Japan and Bonin trenches" Oceanologica Acta. (accepted).

Y.Nozaki、M.Yamada、T.Nakanishi、Y.Nagaya、K.Nakamura、K.Shitashima、H.Tsubota：“日本和小笠原海沟水柱中放射性核素和一些痕量金属的分布”海洋学学报