利用D-T曝光曲线对底片缺陷进行判断

Make a Judgment on the Film Flaw by the Use of Exposure Chart

在实际进行射线照相时曝光曲线的应用是利用曝光曲线选择射线能量、焦距、曝光量等。底片上不同部位的黑度差则是由于射线透照方向上的厚度差引起的,通过曝光曲线以及黑度差确定射线透照方向上的厚度差,对引起厚度差的原因进行定性定量分析,对底片缺陷进行判断评级。

In the actual radiogram, the application of exposure chart refers to selecting ray energy, focus and light exposure by the exposure chart. The difference of blackness at the different positions of film is caused by the thickness difference at the direction of ray transillumination. Then thickness difference at the direction of ray transillunination is determined by the exposure chart and blackness difference. The paper conducts qualitative and quantitative analyses on the causes of thickness, and makes the judgment and evaluation on the flaw of films.