Development of the on-line separation and detection system in photon and charged particle activation analysis for high-sensitive detemination of light elements

轻元素高灵敏测定光子和带电粒子活化分析在线分离检测系统的研制

• 批准号: 09640712
• 负责人: MASUMOTO Kazuyoshi
• 金额: $ 2.43万
• 依托单位: HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
• 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-09640712/
• 关键词: activation analysis; materal analysis; light elements analysis; slectron linear accelerator; photon activation analysis; cyclotron; charged particle activation analysis; flow injection

According as the recent industrial demands for the high-pure materials, it is necessary to develop highly sensitive analytical methods. Since the establishment of the world trading organization (WTO) in 1995, the guarantee of tractability based on precise and accurate analytical methods and analytical standards has become indispensable in each member nation. It has been recognized that activation analysis using an electron linear accelerator and a cyclotron is one of the most prominent method for the determination of trace amount of light elements in high-pure materials. A rapid separation and detection of short lived radioisotopes from light elements is necessary for activation analysis of light elements. In this work, a sequential method has been developed as follows. (1) A bombarded sample is oxidized in a gold image infrared furnace under oxygen stream. (2) A radioactive carbon dioxide is extracted into mono ethanol amine solution in a coiled glass tube. (3) Radioactivity in ethano … More iamine is continuously monitored with a pair of BGO scintillation detector coupled onto a coincidence circuit. Photon activation analysis of carbon in steel standards has been performed at the Laboratory of Nuclear Science, Tohoku University. Carbon can be determined by detecting ィイD111ィエD1C from the ィイD112ィエD1C(γ,n)ィイD111ィエD1C reaction. A sample was irradiated with bremsstrahlung (Emax=30MeV) for 20 min. The oxidation condition such as temperature, time, and amount of accelerator, and the extraction condition of ィイD111ィエD1COィイD22ィエD2 such as concentration of ethanol amine, and flow rate of oxygen, have been checked. A good linear relationship between obtained integral counts and amount of carbon was attained by this system. The detection limit was less than 1 μg/g for the case of steel standard. Charged-particle activation analysis of nitrogen in silicon crystal has been also performed at the Center for Nuclear Study, Tokyo University. Nitrogen was determined by detecting ィイD111ィエD1C from the ィイD114ィエD1N(p,α)ィイD111ィエD1C reaction. Sample was bombarded with proton of 13- MeV, 1μA for 20 min. First, a sample irradiation system was set up on the Rl-production channel. After bombardment, the same separation and detection system as PAA was used for nitrogen determination. It was found that the traditional calibration coefficient for nitrogen analysis using FT-IR method can apply to FZ : silicon but not to CZ silicon. This flow method is hopeful for the light element analysis because of its simplicity and Less

近年来工业上对高纯材料的需求越来越大，发展高灵敏度的分析方法势在必行。自1995年世界贸易组织（WTO）成立以来，以精确和准确的分析方法和分析标准为基础的易处理性保证已成为每个成员国不可或缺的。利用电子直线加速器和回旋加速器进行活化分析是测定高纯材料中痕量轻元素的最主要方法之一。轻元素活化分析需要快速分离和检测短寿命放射性同位素。在这项工作中，一个顺序的方法已经开发如下。(1)轰击后的样品在金像红外炉中在氧气流下被氧化。(2)放射性二氧化碳被提取到一乙醇胺溶液中，在螺旋玻璃管中。(3)乙醇中的放射性 ...更多信息 用耦合到符合电路上的一对BGO闪烁检测器连续监测I胺。东北大学原子核科学研究室对钢标准中的碳进行了光子活化分析。碳可以通过从γ-D112 β-D1C（γ，n）β-D111 β-D1C反应中检测β-D111 β-D1C来测定。用轫致辐射（Emax= 30 MeV）辐照样品20 min，考察了氧化条件如温度、时间、促进剂用量等，以及萃取条件如乙醇胺浓度、氧气流量等。所得积分计数与碳量之间具有良好的线性关系。以钢为标准，检出限小于1 μg/g。东京大学核研究中心也进行了硅晶体中氮的带电粒子活化分析。通过检测来自荧光素D114荧光素D1 N（p，α）荧光素D111荧光素D1C反应的荧光素D111荧光素D1C来测定氮。首先，在R1产生通道上建立了样品辐照系统，利用13 MeV、1μA的质子轰击样品20 min。轰击后，使用与PAA相同的分离和检测系统进行氮测定。结果表明，传统的FT-IR法测氮校正系数适用于熔区硅，而不适用于直拉硅。该流动法简便、快速，有望用于轻元素分析