The technique of kryptonation combined with autoradiography

being used in failure analysis of the works

is described. It offers an extremely sensitive method of displaying microdamages on surface and in subsurface. The advantages of this technique are high sensitivity

which enables the surface microcracks to be revealed with the opening width as fine as 0.05

µ

m

and the possibility of nondestructively detecting subsurface microdamages.It is likely much better than other methods.