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）应用于均匀和非均匀块体物体的核素分布分析和测温。这种新方法提供了大块物体平面横截面上核素位置或温度的二维分布，作为遥感和无损分析的信息。这项研究是在安装在 KENS 的中子共振吸收光谱仪 DOG 上进行的。日本高能加速器研究组织（KEK）。通过记录每个样本物体的方向和中子狭缝位置的光谱来进行测量，以包括物体内部的所有空间信息。利用狭缝位置和旋转角度的所有组合的能谱，利用二维傅里叶变换或最大熵方法进行CT计算。CT重建的核素位置与实际物体结构相符，重建的核素位置与实际物体结构相符。温度分布接近估计的真实分布。为了验证该方法的有效性，我们进行了模拟计算。由于对象具有与实验相同的估计温度分布和统计条件，因此进行了该模拟。实验模拟正确地再现了结果。为了获得更高的准确性，我们需要实现更精细的空间分辨率和更好地依赖 N-RAS 的统计。这种新颖方法的开发与利用中子进行遥感和无损测温的新工业应用有关；因此对于各种工业发展具有潜在的用途。