New Material Characterization method by Using a pulsed Neutron Transmission Spectroscopic Radiography

使用脉冲中子透射光谱射线照相的新材料表征方法

• 批准号: 17206096
• 负责人: KIYANAGI Yoshiaki
• 金额: $ 24.46万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206096/
• 关键词: Radiography; Energy selective transmission; Pulsed neutron source; Bragg edge; Crystal structure; Micro structure; Texture; 加速器; 計測工学; 放射線、X線、粒子線; 量子ビーム

Spectroscopic neutron radiography using a pulsed neutron can give structural information of materials since it has neutron cross section data at each pixel. Especially, at low energy region of the cross section Bragg edges appear which reflect the crystal structure of the materials. The shift of the Bragg position gives strain of the crystal. We performed the experiment on the iron sample which would have strain due to bending. We could clearly observe the strain position and amount of the strain. It was found that the strain appeared on specific crystal planes. It is also indicated that the total neutron cross section around the Bragg edge depended on the grain size of the crystalitte and showed that the cross section decreased proportional to the grain size by a model experiment. Furthermore, the crystal structural change around the welded position of the SS-Iron sample and Iron-Iron sample. The crystal structure change had similar tendency in both sample. Naturally, far from the wel … More d position the cross section showed the typical feature of Bragg edges of iron and SS, as approaching the weld position the edge became sharper, and at weld position the edge had a sharp edge implying the isotropic distribution of the crystallittes. On the other hand, at high energy we can utilize the resonance absorption to get image of elements or nuclei. We performed transmission measurement of the heavy material to get CT image, and it is suggested that the method was also useful for imaging the element distribution and also that we may use this to measure the temperature by analyzing the resonance peak. We developed the sensor of the imaging detector based on Gd composite. We succeeded in making a test detector and also obtained images by using the neutron beam.As mentioned above, the spectroscopic neutron imaging using the pulsed neutron sources are very powerful tool to investigate micro structure of the materials, such as strain, crystallite size, distribution of crystallite and so on. Now, the operation of the big proton accelerator neutron source is just about to take place. We will get much higher quality data by using such high intensity sources and also get much detailed information about the sample materials. Therefore, we are now on the stage to develop the method further to promote the industrial applications. Less

利用脉冲中子的光谱中子射线照相可以得到材料的结构信息，因为它具有每个像素的中子截面数据。特别是在截面低能区出现了反映材料晶体结构的布拉格边。布拉格位置的移动给出了晶体的应变。我们对因弯曲而产生应变的铁试样进行了实验。我们可以清楚地观察到应变的位置和应变的大小。结果发现，应变出现在特定的晶面上。模型实验还表明，Bragg边缘附近的总中子截面与晶石的晶粒尺寸有关，并与晶粒尺寸成正比减小。此外，SS-Iron试样和铁- iron试样在焊接位置周围的晶体结构也发生了变化。两种样品的晶体结构变化趋势相似。在离焊缝较远的位置，截面呈现出典型的铁和SS的Bragg边缘特征，随着焊缝位置的接近，边缘变得更锋利，在焊缝位置边缘有一个锋利的边缘，这意味着晶体的各向同性分布。另一方面，在高能量下，我们可以利用共振吸收来获得元素或原子核的图像。我们对重质材料进行透射测量，得到CT图像，并建议该方法对元素分布成像也有用，并且可以利用该方法通过分析共振峰来测量温度。研制了基于Gd复合材料的成像探测器传感器。我们成功地制作了一个测试探测器，并利用中子束获得了图像。如上所述，利用脉冲中子源进行中子光谱成像是研究材料微观结构如应变、晶粒尺寸、晶粒分布等的有力工具。现在，大型质子加速器中子源的操作即将开始。通过使用这样的高强度源，我们将获得更高质量的数据，并获得关于样品材料的更详细的信息。因此，我们正处于进一步发展该方法以促进工业应用的阶段。少

项目成果

Texture analysis using Bragg-edge neutron transmission method

使用布拉格边中子传输法进行织构分析

• 发表时间: 2007
• 期刊: 2007 IEEE Nuclear Science Symposium Conference Record N24-434
• 作者: K.;Iwase
• 通讯作者: Iwase

Study of Neutron Tomography using Neutron Resonance Absorption

利用中子共振吸收的中子断层扫描研究

• 发表时间: 2007
• 作者: T.;Kamiyama
• 通讯作者: Kamiyama

Imaging and Texture Observation of Materials by Using a Pulsed Neutron Spectroscopic Transmission Method

使用脉冲中子光谱透射法对材料进行成像和织构观察

• 发表时间: 2008
• 作者: Y.;Kiyanagi
• 通讯作者: Kiyanagi

Gd系薄膜シンチレータの開発;(4)中性子計測の試み

钆基薄膜闪烁体的研制；（4）中子测量的尝试；

• 发表时间: 2007
• 作者: 春名;潤
• 通讯作者: 潤

Response function measurement of Gd2Si2O7 scintillator for neutrons

• DOI: 10.1109/nssmic.2007.4437266
• 发表时间: 2007-10
• 期刊: 2007 IEEE Nuclear Science Symposium Conference Record
• 作者: J. Haruna;H. Kaneko;Mikio Higuchi;Sohan Kawamura;Syouhei Saeki;Yasuhiro Yagi;Hiroyuki Ishibashi