Image quality evaluation method of neutron radiography and its application
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摘要: 介绍了中子照相图像质量的评价方法,采用像质指示器对特定反应堆中子照相系统的图像质量进行评价分级。结果表明:热中子束流中的γ射线增加了胶片本底噪声,降低了图像质量;无论采用热中子还是冷中子源,胶片的图像质量评价等级均高于数字图像的,且单面胶片的图像质量等级最优;像质指示器宜与被检测物体一起成像,有利于了解中子照相系统的水平及判别成像质量是否满足被检测物体的验收要求。Abstract: The image quality evaluation method of neutron radiography was presented in this study, and an image quality indicator system was determined to evaluate and grade the image quality of the specific reactor neutron radiography system. The results show that the content of γ ray included in thermal neutron beams shall result in the increment of background noise and the deterioration of image quality. Regardless of thermal or cold neutron source, the evaluated image quality level of film stays ahead of digital image,and the image quality level of single-sided film is the best. The image quality indicators should be imaged together with the detected object, which is helpful to understand the level of neutron radiography system and to judge whether the image quality meets the acceptance requirements of detected objects.
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