Behavior of Radioiodine in Soil

放射性碘在土壤中的行为

• 批准号: 04680223
• 负责人: SEKI Riki
• 金额: $ 1.28万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04680223/
• 关键词: Soil; Radioiodine; Environment; Tracer method; microorganism; Behavior; 環境放射能; ヨウ素; ヨウ素-129; 土壌有機物; 母岩

A variety of components of surface soil is known (parent rocks, clay minerals, organic matters, microorganisms and so on). The contribution of the main component to the sorption of radioiodine in surface soil has been investigated. Radiotracer experiments on the sorption of I^- (iodide) and IO_3^- (iodate) from water to soil have been carried out. Soil samples were collected in forest (Fukui Pref.), field, paddy field and seashore (Ibaraki Pref.). After incubating with tracer solution in a definite days, the soil samples were separated. From radioactivities of two phases the distribution ratio of radioiodine sorption to soil system were calculated. The sorption of I^-by soil was markedly reduced through treatments of air-drying, heating the soil prior to equilibration with water. The sterilization by chloroform fume or irradiation of gamma-ray also reduces the distribution ratio. The measurement of particle size distribution, quantities of water contents, organic matter and microorganisms and pH of soil solution, and other chemical or physical analysis have been carried to estimate the soil properties. Conclusively, the microorganisms has much influence on the sorption of radioiodine as inorganic and organic matter in surface soil.

表层土壤的各种成分是已知的（母岩、粘土矿物、有机物质、微生物等）。本文研究了主要组分对表层土壤吸附放射性碘的贡献。用放射性示踪法研究了土壤对水中碘离子和碘酸根离子的吸附。在森林（福井Pref.）中收集土壤样品，田野、稻田和海滨（茨木县）。土壤样品与示踪剂溶液孵育一定时间后分离。由两相放射性活度计算了放射性碘在土壤系统中的分配比。空气干燥、加热土壤后再用水平衡可显著降低土壤对I^-的吸附。三氯甲烷烟雾灭菌或γ射线辐照灭菌也降低了分配率。通过对土壤颗粒大小分布、含水量、有机质、微生物和土壤溶液pH值的测定以及其他化学或物理分析来估计土壤性质。因此，微生物对土壤无机和有机质吸附放射性碘有很大的影响。

项目成果

Y.Igarashi et al.: "Application of Isotope Dilution for the Determination of Thorium in Biological Samples by Inductively Coupled Plasma Mass Spectrometry" Analytical Sciences. 8. 475-479 (1992)

Y.Igarashi 等人：“应用同位素稀释通过感应耦合等离子体质谱法测定生物样品中的钍”分析科学。

Y.Igarashi: "Application of Isotope Dilution for the Determination of Thorium in Biological Samples by Inductively Coupled Plasma Mass Spectrometry" Anal.Sci.8. 475-479 (1992)

Y.Igarashi：“应用同位素稀释通过电感耦合等离子体质谱法测定生物样品中的钍”Anal.Sci.8。

D. J. Assinder: "Radioisotopes of Thirteen Elements in Intertidal Coastal and Estuarine Sediments in the Irish Sea" J. Radioanal. Nucl. Chem., Articles. 170. 333-346 (1993)

D. J. Assinder：“爱尔兰海潮间带海岸和河口沉积物中十三种元素的放射性同位素”J. Radioanal。

C. K. Kim: "Distribution and Behavior of ^<99>Tc, ^<237>Np, ^<239,240>Pu, and ^<241> Amin the Coastal and Estuarine Sediments of the Irish Sea" J. Radioanal. Nucl. Chem., Articles. 156. 201-213 (1992)

C. K. Kim：“爱尔兰海沿海和河口沉积物 ^<99>Tc、^<237>Np、^<239,240>Pu 和 ^<241>Amin 的分布和行为”J. Radioanal。

Y. Igarashi: "Application of Isotope Dillution for the Determination of Thorium in Biological Samples by Inductively Coupled Plasma Mass Spctrometry" Anal. Sci.8. 475-479 (1992)

Y. Igarashi：“应用同位素稀释通过电感耦合等离子体质谱法测定生物样品中的钍”分析。