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介绍用平板探测器的数字射线照相(DR)技术和用柔性荧光体成像板的计算机射线照相(CR)技术,对锅炉类承压设备受压元件的对接焊缝进行射线实时成像(RTR)检测和质量评价的最新国际动态和应用现状,并与常规胶片射线照相作了比较。实验结果表明:DR可有效取代图像增强器式射线实时成像,检测的锅炉管焊缝单壁厚度可达12mm。用像素间距200μm的平板探测器,当调制传递函数MTF>20%时,可获分辨率优于3线对/mm。CR技术不仅适用于薄板和中厚板焊缝的射线照相检测,还适于板厚100mm以上大厚度锅炉压力容器和压力管道受压元件的检测,射线源从常规的400kV以下的X射线机到直线加速器(≤6M eV),从Ir192到Co60同位素源均可使用,空间分辨率≤25μm,能满足A SM E法规规定的2%的射线照相灵敏度要求。
This paper introduces the real-time radiography (RTR) detection of the butt weld of the compression element of the boiler pressure-bearing equipment by using digital radiography (DR) technology of flat panel detector and computer radiography (CR) technology of flexible fluorescent imaging plate And the status of the latest international developments and applications of quality evaluation and comparison with conventional radiographic radiographs. The experimental results show that DR can effectively replace the image intensifier ray real-time imaging, and the single wall thickness of the boiler tube weld measured can reach 12mm. With a flat panel detector with a pixel pitch of 200 μm, the resolution is better than 3 line pairs / mm when the modulation transfer function MTF> 20% is achieved. The CR technology is not only suitable for the radiographic inspection of thin and medium thick welds, but also suitable for the detection of large thickness boiler pressure vessels with thickness of 100 mm or more and pressure receiving elements of pressure pipes. From the conventional X-ray machines up to 400 kV The linear accelerator (≤6M eV), available from Ir192 to Co60 isotope sources, has a spatial resolution of ≤25 μm and meets the 2% radiographic sensitivity requirements of A SM E regulations.