Developmental and applicational study of neutron CT-scan measurement

中子CT扫描测量技术的发展及应用研究

基本信息

批准号：
16560622
负责人：
KAMIYAMA Takashi
金额：
$ 2.43万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

Neutron resonance absorption spectroscopy (N-RAS) associated with computer tomography was applied to nuclide distribution analysis and thermometry for homogeneous and inhomogeneous bulk objects. This new method provides 2-dimensional distributions of nuclide positions or temperatures on the planar cross-section of a bulk object as information from remote-sensing and non-destructive analysis.The study was carried out on the neutron resonance absorption spectrometer DOG installed at KENS at the High Energy Accelerator Research Organization (KEK) in Japan. Measurements were undertaken by recording the spectra for each sample object's direction and neutron slit position to include all the spatial information inside the object. With the spectrum for the all combinations of the slit positions and the rotation angle, the CT calculations were carried out using the 2-dimensional Fourier transformation or maximum entropy methods.The nuclide positions reconstructed by CT agree with the actual object structure, and the reconstructed temperature distribution is close to the estimated real distribution. To confirm the validity of this method we have undertaken simulation calculations. This simulation was carried out as the object had the same estimated temperature distributions and the statistical conditions as the experiment. The simulation of the experiment correctly reproduced the result. For greater accuracy, we need to achieve finer spatial resolution and better statistical reliance on N-RAS. The development of this novel approach has links to new industrial applications utilizing neutrons for remote-sensing and non-destructive thermometry ; thus being potentially useful for various industrial developments.

与计算机断层扫描相关的中子共振吸收光谱（N-RAS）应用于均匀和不均匀的散装物体的核素分布分析和温度计。这种新方法提供了核素位置或温度在散装物体的平面横截面上的二维分布，作为来自遥感和非损害分析的信息。该研究是对日本高能促进剂研究组织Kens安装在KENS的中子共振吸收光谱仪（KEK）进行的研究。通过记录每个样本对象的方向的光谱和中子缝位置来进行测量，以在对象内包含所有空间信息。使用裂隙位置和旋转角的所有组合的频谱，使用二维傅立叶转换或最大熵方法进行了CT计算。CT重建的核素位置与实际对象结构相一致，并且重建的温度分布接近估计的实际分布。为了确认该方法的有效性，我们进行了模拟计算。进行此模拟是因为该物体具有与实验相同的估计温度分布和统计条件相同的估计条件。实验的模拟正确再现了结果。为了提高准确性，我们需要实现更精细的空间分辨率，并更好地依赖N-RAS的统计依赖。这种新型方法的开发与使用中子进行遥感和非破坏性温度计的新工业应用有联系。因此，可能对各种工业发展有用。