1986年6月,我们参加了由水电部物资局举办的《无损检测用MINAC系列小型直线加速器技术座谈》。主讲人是美国森伯格射线探伤设备公司的总裁——森伯格先生。随着机组容量的增大和核电的发展,各种管道和容器的壁厚也不断增加。例如20万千瓦机组的主蒸汽管道的壁厚约为50毫米,而60万千瓦机组的约为120毫米。这给无损检测带来了许多困难,一般的X机无法检测,同位素检测 In June 1986, we participated in the “Non-destructive Testing MINAC series of small linear accelerator technology seminar” organized by the Ministry of MII. The speaker is the president of the US Senberger X-ray equipment company - Mr. Senberger. With the increase of unit capacity and the development of nuclear power, the wall thickness of various pipes and containers is also increasing. For example, a main steam pipe of a 200 MW unit has a wall thickness of about 50 mm, while a 600 MW unit has a wall thickness of about 120 mm. This brings many difficulties for non-destructive testing, the general X machine can not detect, isotope detection