CLF-1钢X数字射线照相等效系数的确定

Determination of Equivalent Coefficient of X-ray Digital Radiographic for CLF-1 Steel

针对聚变堆结构材料拟采用的新材料CLF-1(low-activated ferritic/martensitic steel)钢在进行射线检测过程中没有特定标准参考的问题,采用等效法在相同透照条件开展了不同厚度CLF-1钢和Q235钢的X数字射线等效透照实验研究。基于相同成像条件下两种材料对应的X射线图像具有相同灰度即透照系数相同,通过对比拥有相同图像灰度值的两种材料的厚度,得出CLF-1钢对应于Q235钢的等效透照系数。试验设计了4~20 mm,递增0.5 mm的阶梯厚度的CLF-1钢和Q235钢在100~400 kV(递增50 kV)管电压条件下进行了透照实验,获得了对应电压下CLF-1钢相对于Q235钢的X射线透照等效系数为1.10~1.13。该研究结果对CLF-1钢在进行X射线检测时的检测技术参数的确定具有指导意义。

This paper focuses on the problem that CLF-1(low-activated ferritic/martensitic steel),a new material to be used as the structural material of the fusion reactor,has no specific standard reference in the process of X-ray detection.The X-ray digital radiography equivalent translucency of CLF-1 steel and Q235 steel with different thickness is studied by using the method of equal effects under the same translucency condition.Based on the same imaging condition,the corresponding X-ray images of the two materials have the same gray value,that is,the transmittance coefficient is the same.By comparing the thickness of the two materials with the same gray value of the image,the equivalent transmittance coefficient of CLF-1 steel corresponding to Q235 steel is obtained. In this paper,test pieces of CLF-1 steel and Q235 steel with thickness from 4 mm to 20 mm,step increased by 0.5 mm,are designed.The translucency test was carried out under the condition of 100 kV to 400 kV(step increased by 50 kV)tube voltage,and the equivalent coefficient of X-ray transmittance of CLF-1 steel relative to Q235 steel under the corresponding voltage was obtained to be 1.10 to 1.13.The results of this paper are instructive to the determination of technical parameters of X-ray detection of CLF-1 steel.