POSITION MEASURING METHOD AND APPARATUS FOR OBJECT

摘要

PROBLEM TO BE SOLVED: To detect an object with high accuracy, even if a fine radiation point moves in the image pickup of the object through transmission using an X-ray source which has minute radiation point. SOLUTION: In the position measuring method of an object 13, where X rays 12 radiated from an X-ray source 11 having a radiation point are transmitted through the object 13 for imaging with an X-ray image pickup tube 14, relationship is obtained beforehand between the X-ray radiation time and the movement value of the position of a reference object within the X-ray image pickup tube. The movement value of the position of the reference object within the X-ray image pickup tube is found from the actual radiation time, to correct the position of the object to be measured.