STUDY OF INTERACTION BETWEEN ACTINOIDS AND COLLOIDAL MATTER IN GROUND WATER

地下水中锕系元素与胶体物质相互作用的研究

• 批准号: 09680472
• 负责人: YAMAZAKI Hiromichi
• 金额: $ 2.24万
• 依托单位: TOHOKU 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 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680472/
• 关键词: In-air PIXE Analysis; Proton Beam; Metal-Microanalysis; Preconcentration; Colloids; Polycarbonate Film; Thorium; Uranium; アクチノイド; フミン酸; 金属水酸化物コロイド

Understanding the sorption mechanism of actinoids having long-term radiological toxity onto colloidal matter in aground water is central to the safety assessment of underground disposal of radioactive wastes. In order to develop a methodology for analyzing compositions of colloids sorbing actinoids without disturbing conditions of an experimental system, a vertical in-air Particle Induced X-ray Emission (PIXE) system has been installed at a single-ended type Dynamitron accelerator in Tohoku University, and we have developed a method for auto-analysis of PIXE spectrum. The air offers a good heat removal from a delicate specimen containing a volatile component. Endurance of Kapton foil used as an exit window of in-air PIXE system for beam irradiation was analyzed in consideration of beam current, diameter and energy loss, which enables us to estimate the lifetime of the Kapton foil under various irradiation conditions. A procedure has been developed and tested for PIXE analysis of solubl … More e and insoluble constituents in a water sample. Three kinds of targets were prepared and analyzed with the PIXE system of 3-MeV proton beam. Insoluble components were filtered on a Nuclepore filter of 0.4-pm pores, and the lower detection limit for ferric hydroxide colloids was a few tens of ppb at an accumulated charge of 3 muG.The concentrations of thorium and uranium higher than 40 ppb were precisely determined by 3-muG irradiation on targets which were made from a 0.12-ml solution containing Ga-internal standard evaporated on a user-madepolycarbonate foil. Uranium(VI) ions in a 25-mi sample were preconcentrated into a thin uniform target containing Pd as an internal standard by means of a combination of dibenzyldithiocarbamate complexation with subsequent condensation into dibenzylidene-D-sorbitol gels, and the low concentration of 4 ppb was easily determined by the PIXE measurement. However this method did not work for concentrating trace thorium ions. The widespread concentrations (several tenths of ppb to a few tens of ppm) of -24 elements from Na to Pb were determined simultaneously in a precision sufficient to reveal the elemental distribution between the soluble and insoluble fractions of riverwaters. The methodology also had good sensitivity and precision enough to detennine concentrations of thorium and uranium lower than their permissible concentrations in drainage from a radioisotopelaboratory. Less

了解具有长期放射性毒性的锕系元素在陆地水体胶体物质上的吸附机理是放射性废物地下处置安全评价的核心。为了开发一种不受实验系统干扰的分析吸附锕系元素的胶体成分的方法，在东北大学的单端型Dynamitron加速器上安装了垂直空气中粒子感生X射线发射（PIXE）系统，开发了PIXE谱的自动分析方法。空气可以很好地去除含有挥发性成分的精密样品的热量。从束流、束径和能量损失等方面分析了Kapton箔作为空气PIXE系统出射窗口的寿命，从而估算了Kapton箔在各种辐照条件下的寿命。本文提出了一种用质子激发X射线荧光分析可溶性有机物的方法。 ...更多信息 e和水样品中的不溶性成分。用3 MeV质子束PIXE系统制备了三种靶，并进行了分析。在0.4 μ m孔的Nuclepore过滤器上过滤不溶性组分，氢氧化铁胶体的检测下限为几十ppb（累积电荷为3 μ G）。钍和铀的浓度高于40 ppb时，用3 μ G辐照靶板，靶板由0.12 ml含镓内标溶液制成。制作的聚碳酸酯箔。通过二苄基二硫代氨基甲酸盐络合与随后缩合成二亚苄基-D-山梨醇凝胶的组合，将25-ml样品中的铀（VI）离子预浓缩成含有Pd作为内标的薄的均匀靶，并且通过PIXE测量容易地确定4ppb的低浓度。然而，该方法不适用于浓缩痕量钍离子。同时测定了从Na到Pb的~ 24种元素的广泛浓度（几十ppb到几十ppm），其精度足以揭示河水中可溶和不可溶部分之间的元素分布。该方法也有良好的灵敏度和精密度，足以测定放射性同位素实验室排水中低于其允许浓度的钍和铀。少

项目成果

H.Yamazaki,et al.: "Preparation of Thin Polycarbonate Film Its Application to PIXE Analysis of Anionic Elements in Weter Samples" International Jounal of PIXE. 7・1&2. 101-108 (1997)

H. Yamazaki 等人：“聚碳酸酯薄膜的制备及其在潮湿样品中阴离子元素的 PIXE 分析中的应用”国际 PIXE 杂志 7・1&2（1997 年）。

Y.Takahashi, et al.: "PIXE Analysis for Drainage from a Radioisotope Laboratory" International Journal of PIXE. 8.1&2 in press. (1999)

Y.Takahashi 等人：“放射性同位素实验室排水的 PIXE 分析”国际 PIXE 杂志。

H.Yamazaki, K.Ishii, S.Matsuyama, Y.Takahashi, T.Sasaki, H.Orihara, and Y.Izumi: "Elemental Analysis of Soluble and Insoluble Fractions of River Waters by Particle-Induced X-Ray Emission" The AIP Proceedings of 15^<th> International Conference on the Appl

H.Yamazaki、K.Ishii、S.Matsuyama、Y.Takahashi、T.Sasaki、H.Orihara 和 Y.Izumi：“通过粒子诱导 X 射线发射对河水中可溶和不溶部分进行元素分析”

S.Matsuyama,et al.: "An Endurance Test of Kapton Foil in-Air PIXE System" The AIP Proceedings of 15^<th> International Conference on the Application of Accelerator in Research and Industry. in press. (1999)

S.Matsuyama 等人：“Kapton Foil in-Air PIXE System 的耐久性测试”第 15 届加速器在研究和工业应用国际会议的 AIP 论文集。

H.Yamazaki, et al.: "Elemental Analysis of Soluble and Insoluble Fractions of River Waters by Particle-Induced X-Ray Emission" The AIP Proceedings of 15^<th> International Conference on the Application of Accelerator in Research and Industry. in press. (1

H.Yamazaki 等人：“通过粒子诱导 X 射线发射对河水可溶性和不溶性部分进行元素分析”第 15 届加速器在研究和工业应用国际会议的 AIP 论文集。