NONDESTRUCTIVE MEASUREMENT METHOD OF THE COATING THICKNESS IN A TRISO-COATED FUEL PARTICLE BY USING THE PHASE CONTRAST X-RAY RADIOGRAPHY IMAGE AND APPARATUS THEREOF

摘要

A nondestructive coating thickness measurement method for a TRISO-coated fuel particle by using a phase difference X-ray radiography image and an apparatus thereof are provided to enhance an inspection process of a TRISO-coated fuel particle by measuring the coating thickness nondestructively. A nondestructive coating thickness measurement apparatus for a TRISO-coated fuel particle by using a phase difference X-ray radiography image includes an X-ray shielding cabinet(1). The X-ray shielding cabinet is made of lead for preventing X-ray from leaking. A vibration-preventive system(2) is installed below the X-ray shielding cabinet in order to block external vibration for maintaining precision under micro meters. An X-ray detector(3), made with semiconductor elements, is installed inside the X-ray shielding cabinet and converts X-ray signals to real-time image signals for increasing detecting efficiency. A sample transporter(5) fixes the coated fuel particle on an intended spot with precision. An X-ray generator(6) has a minimum focus size of 0.2~5mum for obtaining a phase difference image. The X-ray generator controller(7) controls the tube voltage, tube current, and focus size of the X-ray generator. A computer system(8) controls the X-ray generator and the X-ray detector and executes a program for coating thickness measurement. A frame grabber converts image signals to digital signals and inputs the digital signals to the computer system. An image monitor displays an X-ray image and a measurement result.