Macroscopic Cross Section Measurements and Defect Detection in Materials Using Neutron Radiography Technique
Macroscopic Cross Section Measurements and Defect Detection in Materials Using Neutron Radiography Technique
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使用中子射线照相技术进行材料的宏观横截面测量和缺陷检测
DOI：
10.3327/jnst.29.1045
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
A. Tsuruno
中科院分区：
文献类型：
--
作者：
H. Kobayashi;H. Wakao;Y. Ikeda;Kouhei Ohokubo;A. Tsuruno
利用中子照相（NR）技术分析了热中子在具有宽范围散射与非散射截面比r_i的平板中的行为。测量了各种材料的透射率，作为NR研究的基础数据。散射分量进行了估计，并从观测到的中子强度后板测量减去。估算了有效总宏观截面，发现它们与ASTM E748-80的给定值在± 20%内一致。缺陷（空隙和杂质）也进行了分析，并估计其检测限的厚度t的各种r作为t的函数的材料。
Neutron radiography (NR) technique was applied to analyze behaviors of thermal neutrons in slabs, which have a wide range of the ratio r, of scattering to non-scattering cross sections. Transmittances were measured for various materials as basic data for NR study. Scattering components were estimated and subtracted from observed neutron intensities measured behind slabs. Effective total macroscopic cross sections were estimated and were found they agreed with given values of ASTM E748-80 within ±20%. Defects (voids and impurities) were also analyzed, and their detection limits for thickness t were estimated for materials of various r as a function of t.