为了检测管子-管板角焊缝内部缺陷，提出了基于线阵探测器的管子-管板角焊缝射线数字检测方法。介绍了线阵列探测器成像原理，通过对管子-管板角焊缝试件的射线数字透射成像试验，分析了线阵列探测器在X和γ射线照射下的图像特点。试验表明，相比X射线，利用γ射线采集的图像质量稍差，并且整体灰度偏暗，采集时间较长。得出了影响线阵列探测器γ射线数字图像质量的一些关键因素，为线阵列探测器应用于γ射线提供了试验及应用依据。

To test the tube-to-tubesheet fillet weld internal defects, the paper proposed the ray digital detection method which was based on the linear array detector. This paper introduced the imaging principle of the linear array detector, and analyzed the image characteristics of the linear array detector of both X and γ-ray irradiation by the radiography test of the tube-to-tubesheet fillet weld specimens. The test showed that compared to the X-ray, γ-ray collected images quality was lower, and overall gray was darker, acquisition time was longer. Some of the key factors were obtained that affected the γ-ray linear array detector digital image quality. At the same time this paper provided an experimental and application basis for which the linear array detector was used in γ-ray test.