Question

Problem 2. X-rays a) Maybe the most common characterization method that uses X-rays, is X-ray Absorption Imaging. This is basically the same technique as used in hospitals and dentistry. i. What is the sample/ material parameter that makes contrast (dark/ bright image features) in an X-ray absorption image? ii. Explain what is meant by (2D) X-ray Absorption Imaging being a “shadow image”. iii. What limits the resolution in an X-ray Absorption Image? b) Most X-ray based spectroscopy techniques have an electron-beam spectroscopy counterpart (that probes the same or similar physical phenomenon in the sample/ material). i. Give a brief description of why this is the case. ii. Give advantages and disadvantages of using X-ray techniques vs. e-beam techniques. Use XRF vs. EDX (in a SEM) as your example techniques for this discussion. c) For surface-sensitive X-ray characterization, grazing incidence is used. Explain the physical background for this.

Answer 1