Patent ID: 6885727
Filing Date: 2005-04-26
Classification: G01N

Abstract:
1. An apparatus for measuring the thickness and composition of a multi-layered sample, the apparatus comprising: an X-ray generator for generating primary X-rays; a sample holder for supporting a sample having a tin-copper alloy plating layer disposed on a film comprised of one or more layers including at least a copper layer; a collimator for focusing primary X-rays generated by the X-ray generator and allowing part of a luminous flux of the primary X-rays to irradiate onto a microscopic area of the sample so that fluorescent X-rays and diffracted X-rays are emitted from the sample; an energy-dispersive X-ray detector for detecting the fluorescent X-rays and diffracted X-rays emitted from the sample; and means for generating an X-ray spectrum of the fluorescent X-rays and diffracted X-rays detected by the energy-dispersive X-ray detector, measuring the concentration of copper in the tin-copper alloy plating layer of the sample using peak intensities of the diffracted X-rays in the X-ray spectrum, and measuring the thickness of the tin-copper alloy plating layer of the sample using peak intensities of the fluorescent X-rays in the X-ray spectrum and the measured concentration of copper.